[meteorite-list] AD: Black Rock 001 Paymaster Mine (AD)
Plain text, version ;-) From: Jeff Pringle j...@earthlink.net Subject: Black Rock 001 Paymaster Mine (AD) Date: March 17, 2015 2:01:50 PM PDT To: meteorite-list@meteoritecentral.com Hi All! Just a heads-up, I put a slice of each of these meteorites on ebay ;-) Paymaster Mine 7.9 grams http://www.ebay.com/itm/131457602605 Black Rock 001 10.5 grams http://www.ebay.com/itm/131457599049 I hope you're all having an extraterrestrial St. Patrick's day! Jeff __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com https://pairlist3.pair.net/mailman/listinfo/meteorite-list
[meteorite-list] AD-Black Rock 001
i everyone! I just wanted to alert you, I finally remembered to make a bit of Black Rock 001 available to the collecting community. Considering how often I think about selling, this is a unique opportunity to acquire a must-have meteorite for collectors of Nevada meteorites, fans of the Black Rock Desert, and of course lovers of little black rocks :-D Check it out on ebay, http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=130715833988 Best regards, Jeff __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Rocks From Space POD 7-27
http://www.spacerocksinc.com/July_27_2007.html That's an unusual texture, I think the geologists call it spherulitic - indicative of rapid cooling. Here's an example of a similar texture in Apollo rock 60017: http://ser.sese.asu.edu/cgi-bin/DPSC_Data.pl?search=1rock=60017piece=size=slide=coments= Got any thin section micrographs of that meteorite yet? Anyone recall seeing another meteorite with that texture? __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] I write to seek some advice re EMP
I'm also interested in some broader artikles on EMP with regard to meteorites ie wot particularly is EMP looking for and how it differentiates from say terrestrial rox Electron Microprobe is (among other things) a more quantitative way of determining mineral composition that the traditional optical mineralogy methods, so to understand Fayalite you should look into basic mineralogy info. Fayalite is a component of Olivine, but separating out earth ET rocks depends on more than just one mineral. It seems the Fe/Mn ratio of pyroxene is more commonly referenced. See for example Pigeonholing Planetary Meteorites in the publications section of this website: http://www-curator.jsc.nasa.gov/antmet/marsmets/index.cfm More on the differences between earth and space rocks can be figured out by reading this article: http://www.lpi.usra.edu/science/treiman/frass_rock.pdf More on the mineralogy of meteorites can be found in many places, but this one is tops: http://www.meteoritestudies.com/ Look through the old bulletins here: http://www.meteoriticalsociety.org/simple_template.cfm?code=pub_bulletin Pick a couple good key words and more articles than you can read in a year are here: http://adsabs.harvard.edu/abstract_service.html Best of luck on your rocks! __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Moss classification speculation
So no one has yet checked Moss' magnetic susceptibility? Seems like if Logx was anything other than low to mid 4s you'd know it is something unusual, if not exactly what it is. On another note, I hope nobody sells any of this to Keith Richards, you don't want to prove the old adage wrong! ;-) __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Re: LUNAR THIN SECTIONS
And when you are done with that site, it's time to dive into this treasure trove: http://cps.earth.northwestern.edu/cgi-bin/DPSC_Browse.pl ...thousands of slides from all the Apollo missions, searchable! Have fun, Jeff Hi, All, Fans of thin section photos may have already found this website, but if not, you should take a look at: http://www.union.edu/PUBLIC/GEODEPT/COURSES/petrology/moon_rocks/ A very large number of Lunar thin sections, nicely photographed by Kurt Hollocher of Union College in Schenectady, NY. Beautiful stuff. Sterling K. Webb __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Satellite Reentry Witness 3
In late August of '99 I was camping in the Nevada desert. One evening, as twilight turned into darkness, a fireball burned across the sky from horizon to horizon (that's a pretty big distance in the Nv desert!). I caught sight of it at about 1/3 of the way across. It was traveling directly east at a leisurely pace (compared to meteors), leaving a wide, glittering trail of many colors which hung in the air for a moment or three after. The most amazing celestial spectacle I've ever seen, suprising and awesome. I remember finding out that it was a satellite reentry, but don't recall the details. Jeff __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Meteorite Humor
The Demotivator people did a met-related poster, but used a photo of a comet - http://www.despair.com/wishes.html Black Rock, Jeff __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
RE:[meteorite-list] Bowie Knife from Meteorite?
The meteorite content is apocryphal. Most knives were sheffield steel at that time. Here's a good synopsis of the story: http://en.wikipedia.org/wiki/Bowie_knife __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] NWA 2906, NWA 869
Bob wrote: With all due respect.. that's NWA 869. See, I would have said that had too much rust staining (aren't those chondrules a little vague as well?)to be 869...though I don't claim to be an expert. I have bought a couple unclassified stones (allegedly from Rissani) that look waaay more 869ish than those photos. I still think them what claim to know this mysterious meteorite ought to step up to the plate (out on that limb?) and say what makes 869 distinctively 869. Greenish tint to crust? Bluish tint to matrix? List the clast types? Describe, in some way, something? Haven't you noticed that when you get ten people saying you know it when you see it, at least two of those people are talking about something else entirely? Jeff __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] RE: NWA 869
Mike wrote: it is a very distinct meteorite, unmistakable to anyone who knows it. Could those of you 'who know it' list the features which make NWA 869 distinctive? Thanks, Jeff __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] RE: NWA 869
Dave list - handle a few kilo's of 869, and you will get the idea. It just seems that if you want to get 'NWA 869' out of the garbage can and into the Met. Bulletin, *somebody* has to articulate what makes one slightly weathered, brecciated L4-6 'NWA 869', and another one not - since it's sold by every meteorite middleman out there (and half the time as 'unclassified'), it'd be interesting to see how everyone's lists of features match up, too, don't you think? The main thing specifically mentioned on 869 sale pages is occasional 'dark inclusions' - surely there are other diagnostic features? Several websites claim it is 'paired with' or 'sold as' NWA 787, NWA 900 - and other numbers - how many others? Which ones? This list might be the best place to gather that information, or determine that what everyone has been calling NWA 869 is actually NWA something else, already classified with an erroneous TKW. Or is that a can of chondrules not to be opened? Jeff __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] NWA 869 format correction
Reformat of previous message - Dave list - handle a few kilo's of 869, and you will get the idea. It just seems that if you want to get 'NWA 869' out of the garbage can and into the Met. Bulletin, *somebody* has to articulate what makes one slightly weathered, brecciated L4-6 'NWA 869', and another one not - since it's sold by every meteorite middleman out there (and half the time as 'unclassified'), it'd be interesting to see how everyone's lists of features match up, too, don't you think? The main thing specifically mentioned on 869 sale pages is occasional 'dark inclusions' - surely there are other diagnostic features? Several websites claim it is 'paired with' or 'sold as' NWA 787, NWA 900 - and other numbers - how many others? Which ones? This list might be the best place to gather that information, or determine that what everyone has been calling NWA 869 is actually NWA something else, already classified with an erroneous TKW. Or is that a can of chondrules not to be opened? Jeff __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] PV reading list
Go to: http://adsabs.harvard.edu/abstract_service.html Type in portales valley (including quotes) and click the box 'require title for selection' Click the 'send query' button, and you got 32 papers on PV, most of which are available full text. The background of the current reclassification proposal, if you will. *works for every other topic of meteoritical interest, too* Happy reading! The contents of this message may be privileged and confidential. Therefore, if this message has been received in error, please delete it without reading it. Your receipt of this message is not intended to waive any applicable privilege. Please do not disseminate this message without the permission of the author. __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Re: 13.5 kg lunar
Doug escribe: ...how nice that this finder seems to be happy to share the meteorite with scientists! Dude, it seems to me the finder does not give a rat's anorthite for the science of meteoritics, or sharing for that matter, if all they could kick down for a type specimen is 20 of their 13,500 grams. I hope it's a typo, or not the full story, 'cause a better example of stingy you'd be hard pressed to find! Jeff The contents of this message may be privileged and confidential. Therefore, if this message has been received in error, please delete it without reading it. Your receipt of this message is not intended to waive any applicable privilege. Please do not disseminate this message without the permission of the author. __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Re: Meteorite Hunting Laws
Adam wrote: 'I am tired of all the gray area talk. What are the laws?' But after looking at some of the laws, it seems the laws ARE the grey area! Can a list member with some legal facility look into the case of the Old Woman meteorite and tell us how the laws were interpreted in that case? Does that case have any bearing on current meteorite collecting? It's all fun and games 'til somebody finds a lunar. Jeff The contents of this message may be privileged and confidential. Therefore, if this message has been received in error, please delete it without reading it. Your receipt of this message is not intended to waive any applicable privilege. Please do not disseminate this message without the permission of the author. __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
RE: [meteorite-list] Re: 13.5 kg lunar (Significance)
Doug wrote: 'is she stingy because she doesn't send it to the Chop Shop for slicing and dicing to be distributed to careful collectors as well as those who habitually break them into pieces and allow to weather away in some corner, before it had been even classified?' No, and I do not know the whole story, and do hope I was wrong in my 'stingy' comment. But a cut was made, this much for the science - this much for grandma. Were I to stumble over a lunar, I think I'd place the cut differently - but that's a decision I'd have to be extremely lucky to ever get a chance at making. Yes, pictures would be nice, for us earthlings. Jeff The contents of this message may be privileged and confidential. Therefore, if this message has been received in error, please delete it without reading it. Your receipt of this message is not intended to waive any applicable privilege. Please do not disseminate this message without the permission of the author. __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] meteorite hunting laws
List -
Did anyone notice in the provisional Met Bull 89 that someone found a 13.5 KILO
lunar in the Kalahari back in '99? Is that old news?
National Parks are off limits, but if I ran across a meteorite in the Nat'l
Parks of the desert I'd feel obligated to at least point it out to a University
or the Smithsonian, why should those parkland meteorites not get their chance
at doing some scientific good?
Hey, guess what - the code of federal regulations ('laws' to you and me) is on
line and searchable here:
http://www.gpoaccess.gov/cfr/index.html
Some poking around under the BLM section reveals you are fine unless you mean
to barter or sell to commercial dealers (now who would do that?), in which case
you need a permit - but I'm sure this is a general rule of thumb
manipulate-able by lawyers or superceded by other specific regulations. And if
you found that 13.5 kilo lunar in the Mojave, the gov't could declare it a
special exception, but you'd prob'ly be able to get them to cough up some
compensation if they did something like that.
Here is the unedited section of main interest:
[Code of Federal Regulations]
[Title 43, Volume 2]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 43CFR8365.1-5]
[Page 917]
TITLE 43--PUBLIC LANDS: INTERIOR
CHAPTER II--BUREAU OF LAND MANAGEMENT, DEPARTMENT OF THE INTERIOR
PART 8360_VISITOR SERVICES--Table of Contents
Subpart 8365_Rules of Conduct
Sec. 8365.1-5 Property and resources.
(a) On all public lands, unless otherwise authorized, no person
shall;
(1) Willfully deface, disturb, remove or destroy any personal
property, or structures, or any scientific, cultural, archaeological or
historic resource, natural object or area;
(2) Willfully deface, remove or destroy plants or their parts, soil, rocks
or minerals, or cave resources, except as permitted under
paragraph (b) or (c) of this paragraph; or
(3) Use on the public lands explosive, motorized or mechanical
devices, except metal detectors, to aid in the collection of specimens
permitted under paragraph (b) or (c) of this paragraph.
(b) Except on developed recreation sites and areas, or where
otherwise prohibited and posted, it is permissible to collect from the
public lands reasonable amounts of the following for noncommercial
purposes:
(1) Commonly available renewable resources such as flowers, berries, nuts,
seeds, cones and leaves;
(2) Nonrenewable resources such as rocks, mineral specimens, common
invertebrate fossils and semiprecious gemstones;
(3) Petrified wood as provided under subpart 3622 of this title;
(4) Mineral materials as provided under subpart 3604; and
(5) Forest products for use in campfires on the public lands. Other
collection of forest products shall be in accordance with the provisions of
Group 5500 of this title.
(c) The collection of renewable or nonrenewable resources from the
public lands for sale or barter to commercial dealers may be done only
after obtaining a contract or permit from an authorized officer in
accordance with part 3600 or 5400 of this chapter.
The contents of this message may be privileged and confidential. Therefore, if
this message has been received in error, please delete it without reading it.
Your receipt of this message is not intended to waive any applicable privilege.
Please do not disseminate this message without the permission of the author.
__
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[meteorite-list] FW: meteorite hunting laws
I should mention that the word 'meteorite' only shows up in the federal
register in regards to Antartic collecting, where they are all consigned to
science - I am making a presumption that they fall under 'mineral specimen' or
'non-renewable resource' for the public lands.
-Original Message-
From: Jeff Pringle
Sent: Friday, May 13, 2005 4:14 PM
To: 'meteorite-list@meteoritecentral.com'
Subject: meteorite hunting laws
List -
Did anyone notice in the provisional Met Bull 89 that someone found a 13.5 KILO
lunar in the Kalahari back in '99? Is that old news?
National Parks are off limits, but if I ran across a meteorite in the Nat'l
Parks of the desert I'd feel obligated to at least point it out to a University
or the Smithsonian, why should those parkland meteorites not get their chance
at doing some scientific good?
Hey, guess what - the code of federal regulations ('laws' to you and me) is on
line and searchable here:
http://www.gpoaccess.gov/cfr/index.html
Some poking around under the BLM section reveals you are fine unless you mean
to barter or sell to commercial dealers (now who would do that?), in which case
you need a permit - but I'm sure this is a general rule of thumb
manipulate-able by lawyers or superceded by other specific regulations. And if
you found that 13.5 kilo lunar in the Mojave, the gov't could declare it a
special exception, but you'd prob'ly be able to get them to cough up some
compensation if they did something like that.
Here is the unedited section of main interest:
[Code of Federal Regulations]
[Title 43, Volume 2]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 43CFR8365.1-5]
[Page 917]
TITLE 43--PUBLIC LANDS: INTERIOR
CHAPTER II--BUREAU OF LAND MANAGEMENT, DEPARTMENT OF THE INTERIOR
PART 8360_VISITOR SERVICES--Table of Contents
Subpart 8365_Rules of Conduct
Sec. 8365.1-5 Property and resources.
(a) On all public lands, unless otherwise authorized, no person
shall;
(1) Willfully deface, disturb, remove or destroy any personal
property, or structures, or any scientific, cultural, archaeological or
historic resource, natural object or area;
(2) Willfully deface, remove or destroy plants or their parts, soil, rocks
or minerals, or cave resources, except as permitted under
paragraph (b) or (c) of this paragraph; or
(3) Use on the public lands explosive, motorized or mechanical
devices, except metal detectors, to aid in the collection of specimens
permitted under paragraph (b) or (c) of this paragraph.
(b) Except on developed recreation sites and areas, or where
otherwise prohibited and posted, it is permissible to collect from the
public lands reasonable amounts of the following for noncommercial
purposes:
(1) Commonly available renewable resources such as flowers, berries, nuts,
seeds, cones and leaves;
(2) Nonrenewable resources such as rocks, mineral specimens, common
invertebrate fossils and semiprecious gemstones;
(3) Petrified wood as provided under subpart 3622 of this title;
(4) Mineral materials as provided under subpart 3604; and
(5) Forest products for use in campfires on the public lands. Other
collection of forest products shall be in accordance with the provisions of
Group 5500 of this title.
(c) The collection of renewable or nonrenewable resources from the
public lands for sale or barter to commercial dealers may be done only
after obtaining a contract or permit from an authorized officer in
accordance with part 3600 or 5400 of this chapter.
The contents of this message may be privileged and confidential. Therefore, if
this message has been received in error, please delete it without reading it.
Your receipt of this message is not intended to waive any applicable privilege.
Please do not disseminate this message without the permission of the author.
__
Meteorite-list mailing list
Meteorite-list@meteoritecentral.com
http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] First meteoriticist? Criminal!
I just ran across this paragraph in Doubt - A History by J.M. Hecht - The philosopher Anaxagoras is the earliest historical figure to have been indicted for atheism - in fact, it seems they wrote the law just for him. A meteorite had fallen in 467 BCE and it convinced Anaxagoras that the heavenly bodies, including Helios, the sun, were just glowing lumps of metal. Other people had this information - the meteorite didn't fall in Anaxagoras' backyard - but he was a philosopher and a rationalist and he came to conclusions that were not attractive to everyone. This was the origin of a conflict between religion and science. Here, new information, new empirical data, led to a direct challenge to the way in which the gods were envisioned. This new doubt encouraged a new kind of punishment for doubt. Set up about 438 BCE, the law against Anaxagoras' atheism held that society must denounce those who do not believe in the divine beings or who teach doctrines about things in the sky. 2000 years before Chladni! The contents of this message may be privileged and confidential. Therefore, if this message has been received in error, please delete it without reading it. Your receipt of this message is not intended to waive any applicable privilege. Please do not disseminate this message without the permission of the author. __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] mars iron classification
Looks like some traces of widmannstaetten pattern on day 352 of the microscopic imager - http://marsrovers.jpl.nasa.gov/gallery/all/1/m/352/1M159431474EFF40DPP2936M2M1.JPG anybody want to try for a visual classification from millions of miles away? __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
RE: [meteorite-list] shock effect?
Frank wrote: Much of the ring structure appears to parallel the shape of the meteorite suggesting to me that weathering is responsible for the major part of what we are seeing, especially if, as I suspect, it was found on a now not so dry lake. Well, it is a lake bed find, but that parallel shape is a coincidence on this one face. The back side of that slice (2mm away) looks like this: http://www.home.earthlink.net/~jlp3/images/M0301-7.jpg And the end that I cut off for the type sample didn't show it at all. It seems to be a local phenomenon. Contributing to my suspicion that it is a shock effect are pre-terrestrial (fused by the fusion crust where they meet it) cracks concentrically arranged farther out from the dark area. But I've been wrong before! Jeff The contents of this message may be privileged and confidential. Therefore, if this message has been received in error, please delete it without reading it. Your receipt of this message is not intended to waive any applicable priviledge. Please do not disseminate this message without the permisson of the author. __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] shock effect?
Check out the concentric bands in this photo of my Nevada find - http://www.home.earthlink.net/~jlp3/images/M0301-8.jpg Looks like the growth rings of an asteroidal tree. Presumably a fossilized shockwave, written in darkened silicates - Do you think that's the right reason for this structure? Any other ideas? Any other photos of similar effects out there? Jeff The contents of this message may be privileged and confidential. Therefore, if this message has been received in error, please delete it without reading it. Your receipt of this message is not intended to waive any applicable priviledge. Please do not disseminate this message without the permisson of the author. __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Meteorite Substitution- What if...
Having seen a couple US desert meteorites and a couple NWAs up close, they seem to weather very differently, and the dirt also looks quite dissimilar. This prob'ly doesn't hold across the board, but I bet it's true of most. If anyone wants to trade some common NWA achondrite for a slice of the new, under-classification chondrite pictured in last month's Nevada Picture of the Day, send me an email to discuss Jeff __ Meteorite-list mailing list [EMAIL PROTECTED] http://six.pairlist.net/mailman/listinfo/meteorite-list
RE: [meteorite-list] The Relic and Some Images
Don't dis the african tribal iron skills- they've been smelting iron from ore and working it with much skill for thousands of years - they may have even invented the technology before the romans. As a backyard smelter, I can tell you it is no easy task, even with electricity all modern technology. Someone familiar with art restoration and conservation would probably be able to remove the staples holding the rock in there without damaging the artifact - your local museum might be able to direct you to a company they use. My immediate thought was that the iron work is made by someone with considerable skill in metal working, and for a tribe the 1700's in south Africa that would be some feat. __ Meteorite-list mailing list [EMAIL PROTECTED] http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Metal-sulfide question
I ran across this paper - http://www.lpi.usra.edu/meetings/lpsc2000/pdf/1420.pdf Which mentions dendritic metal-sulfide intergrowths in CR-clan meteorites, and I was wondering if this is a common feature of impact melts/breccias, or is it an unusual feature? Does anyone have a good photo of this effect, since the one in the paper is kinda lo-res? Thanks! __ Meteorite-list mailing list [EMAIL PROTECTED] http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Anyone seen a meteorite like this?
Check out the chondrule-like structures in this rock: http://home.earthlink.net/~jlp3/images/M0404-2.jpg It's harder than steel, softer than quartz and does not react to HCl acid, seems to lack metal. Opinions anyone? Jeff __ Meteorite-list mailing list [EMAIL PROTECTED] http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] RE: Stoffler Shock Stage on line
Jeff Kuyken and list: Just ran across an on-line copy of Stoffler OC shock classification here: http://www.museum.hu-berlin.de/home.asp?page=http://www.museum.hu-berlin.de/ min/forsch/forschprojects/planet/asteroidmeteor.asp?lang=1 But it's a 2001 update, not the original '91. Good read, though. __ Meteorite-list mailing list [EMAIL PROTECTED] http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] RE: Crust and Meteorite Thin Sections
To Mark and list - Thanks for the reply and the cool photos! I realize the actual structure of the rock is what counts, I just happened to find a meteorite (OC) last year due to it's crust, and am now fixated on crusts as a way to differentiate earth from space rocks. I'll get over it eventually. I was hoping for a shortcut that involves a less intense level of optical mineralogy knowledge. Isotropy can be determined with a regular microscope, two polarizers and some duct tape, but seeing how much anorthite is in yer plagioclase or separating the various clinopyroxenes is more challenging and is perhaps impossible without real knowledge and equipment. I've got a copy of Nesse and am learning as fast as I can, but would still like to be 95% sure a rock is extra-terrestrial before I bother a planetary scientist with it for classification. It is the achondrites that are harder to get to that level of sureness. And if I pick up an unusual rock, I want to know if it's a meteorite NOW. (Of course, it's easy - the answer is NO!) But it looks like there are no shortcuts, I will keep hitting the books and the Ansmet petrographic descriptions, and spend my tax refund on a real microscope. Thanks for your help! Jeff __ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Telling 'rite from 'wrong
Any of you who have strolled through the desert looking at rocks have prob'ly noticed that there are a great variety of weathering rinds and desert varnishes which look more or less like fusion crusts, depending on the type of rock and location in the desert. Since fusion crusts are glassy, they are isotropic and appear black under crossed polarized light. Are any of the desert faux-crusts also isotropic? Is this a reasonable way to tell 'rite from 'wrong? If you found a basaltic rock with a thin black rind in the desert and the rind looked translucent red and isotropic in thin section, would you say I got a meteorite or My, what an interesting caliche? What other ways of differentiating rind from crust are there? __ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list
