Re: [meteorite-list] Zagora CR2 NWA 801
So, based on your argument, everytime Dave Andrews searches the Holbrook strewnfield and finds an obvious Holbrook, that diminishes the value of all other "legitimate" Holbrooks.Should thisflawed argument hold true for every other strewnfield on earth.? NWA 801 is just as valid a name as Holbrook, Canyon Diablo, Sikhote-alin, Imilac, Gao, Glorietta or any other meteorite that comes from a strewnfield. Any future finds that are obvious pairings should be called exactly what they are. Doesn't matter if it is a named or numbered strewnfield the logic is the same. Randy From: Robert Verish <[EMAIL PROTECTED]> To: Meteorite-list Meteoritecentral <[EMAIL PROTECTED]> Subject: [meteorite-list] Zagora "CR2" "NWA 801" Date: Mon, 25 Feb 2002 19:48:16 -0800 (PST) But then, you find all your competitors calling their stones "NWA 801"! They are essentially reaping the benefits of your efforts. Or worse, the dilution caused by all their various "NWA 801" stones may negate the value of your genuine, classified mass. I would think this would be a concern of yours, as well. Join the worlds largest e-mail service with MSN Hotmail. Click Here __ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] SALE - Meteorites from the Tucson Show
List Members, I apologize if any of you are getting two copies of this, but for whatever reason some of my posts to the List aren't going through. Best, John = Here are a few meteorite specimens I have to offer. Monze - A fall from Zambia...and the only meteorite from that country. Juancheng - Another fall - this one from China Delaware - A new meteorite from Arkansas...found in 1972 and recognized in 2001 - nicely brecciated. Richfield - A wonderful LL3.7 from Kansas - some of these specimens are REALLY thin! Free shipping on purchases of $120.00 or more. First come, first served. Interested parties follow this link: http://www.meteoriteimpact.com/JGMsale.htm Regards, John Gwilliam John Gwilliam Meteorites PO Box 26854 Tempe AZ 85285 http://www.meteoriteimpact.com
[meteorite-list] How Hubble Has Survived a Decade of Impacts
http://www.space.com/scienceastronomy/astronomy/hubble_impact_020226.html How Hubble Has Survived a Decade of Impacts By Robert Roy Britt space.com 26 February 2002 With little more protection than what your family car would provide, the Hubble Space Telescope has endured 12 years of bombardment by tiny bits of debris, leaving the craft covered with hundreds of little divots and one gaping hole that illustrate how hostile space can be. Photographs taken during a 1999 servicing mission and released last month reveal how frequently Hubble is peppered by tiny specs of space dust and, more often, bits of metal, paint and other garbage left behind by dead spacecraft and previous missions. On average, every square meter of Hubble gets hit by about 5 sand-grain-sized bits each year, says debris expert Nick Johnson of NASA's Johnson Space Center. Such debris is too small to see and avoid. So far, the impacts have not threatened the telescope's ability to function. We're talking about little tiny imperfections that really have no negative impact on the vehicle, Johnson said in a telephone interview. You could bring Hubble back and put it in the Smithsonian, and it will look good. But if you look up close there will be all these little dings in it. There are no plans just yet to stick Hubble in a museum. Instead, a fourth servicing mission to the telescope, planned for liftoff later this week, will add a new camera to the telescope and take more pictures of its pit-riddled exterior. Interestingly, Hubble has survived the slew of minor impacts in spite of the fact that it carries little in the way of special protection. The International Space Station and the shuttles are equipped to handle marble-sized impacts, in order to protect their human cargo. But like most spacecraft not designed to carry a crew, Hubble's skin is a lot like a well-built car. The metal in an old Mercury is as good as many spacecraft, Johnson says. Tally of impacts Pictures released by NASA in a January newsletter show some of the 571 dings that were counted in the most recent photographic survey, taken by shuttle astronauts during the 1999 servicing mission. Most of the pockmarks are less than 3 millimeters across, about the size of this o on your computer screen. Johnson said there are probably more than 1,000 such blemishes, an estimate that reflects the fact that not all areas of the spacecraft were photographed. In addition, many, many smaller dings and scratches surely cover the spacecraft, but they are not visible with the camera equipment used, he said. Johnson said the worst impact so far was spotted during the first Hubble servicing mission, back in 1993. There was a good-sized hole in the high-gain antenna, he said. Fortunately it went right on through like a cookie cutter and the antenna continues to work. Astronauts got a photograph of that hole, and it was subsequently measured to be three-quarters of an inch in diameter, a hole shot through a more than a quarter-inch of Space Age honeycombed composite material with a graphite-epoxy face sheet. Ouch. NASA officials do not discount the threat of impacts on their spacecraft. But it's the larger stuff that most frightens them. And they call the growing sea of manmade junk -- caused by explosions, spacecraft impacts, and even nuts and bolts left behind during missions -- an increasing threat. The space agency estimates there are 4 million pounds of junk orbiting Earth, including more than 100,000 objects 1 centimeter (about 0.3 inches) and larger. An impact by one of these larger objects could destroy or disable a satellite like Hubble. A fast moving object can vaporize on impact, generating a cloud of plasma, or electrically charged particles. An electrical current can then flow from one part of the craft, through the plasma cloud, and then destroy an instrument on another part of the craft -- similar to the damage caused by a lightning strike. A telescope's lens, of course, would not fare will if hit. A camera lens or mirror can be compromised with any blemish larger than half a millimeter or so. But the odds of that happening to Hubble are extremely small, Johnson said. A long tube designed to shade the Sun also protects the lens. A particle would have to enter the tube at a perfect angle to make it all the way to the lens. Experience has taught the telescope's operators which angles to avoid. All spacecraft at risk Hubble isn't the only spacecraft that runs into debris. NASA's fleet of shuttles are hit dozens times on every mission, Johnson said. They typically leave a little scratch or a crater much smaller than the pebble crater you'll see on your automobile windshield. One or two exterior windowpanes are typically replaced after each mission, however, and dozens of windows have been replaced over the years. Larger debris sometimes forces mission planners to change the orbital position of a spacecraft to
[meteorite-list] [OT] John Glenn Anniversary Website
Dear Listees: A little off-topic, but this nice site commemorating the 40th anniversary of John Glenn's flight in Friendship 7 will interest many of you, I'm sure. It includes some good photos from the John Glenn Archives. The anniversary of Glenn's flight was last week (Feb. 20). Probably about time to watch The Right Stuff again! http://www.lib.ohio-state.edu/arvweb/glenn/flight.htm Regards, Geoff N. __ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] rocksonfire off-line until end of April
Dear Listee's and Friends, just to let you know that we'll be off-line until the end of April as we are going to tour the Australian Outback for the next eight weeks in search for new meteorites and to buy new stock. If you want to get in contact with us, try [EMAIL PROTECTED] . We'll check our inbox every time we are back to civilisation. I may even have a bid at eBay as rocksonfire*. Cheers, folks, and be good! >From down-under, Norbert F. Kammel IMCA #3420
[meteorite-list] Meteowrongs on German eBay
Hello, my friends in Germany! These Meteowrongs look for me more like very ordinary Indochinite Tektites. Here is the URL: http://cgi.ebay.de/aw-cgi/eBayISAPI.dll?ViewItemitem=2005913581 Norbert F. Kammel rocksonfire IMCA #3420
Re: [meteorite-list] puzzling Putorana
Hello, All I was just looking at my sample of iron from Disco Island. It weighs about 350 gr. and is about the size of a handball. I ground a corner off to have a better look at its structure and found it looks more like a silicated iron meteorite with a continuous field of iron surrounding small blebs of gray silicates. I would guess 90% iron and 10% silicates. My slice of Putorana is about 50/50 iron /silicates. I do recall seeing a sample of iron in basalt from Germany that looked a lot like Putorana. Regards, Fred Olsen - Original Message - From: Treiman, Allan [EMAIL PROTECTED] To: metlist [EMAIL PROTECTED] Sent: Monday, February 25, 2002 1:06 PM Subject: RE: [meteorite-list] puzzling Putorana Hi, all - With Matt Morgan's help, we've just finished a paper on the Putorana rock, and it should be published in July (?) with the Meteoritical Society meeting abstracts. The paper is bigger and more formal than the article(s) in Meteorite . If you'd like a preprint, send me your email or postal address! Personally, I'm not real keen on the Putorana iron coming from the Earth's core. It seems like an awfully long way for heavy stuff like iron metal to rise (or be carried up). The Diskoisland metal supposedly formed when molten basalt hit coal seams. The reaction was like smelting - iron oxide in the basalt magma reacted with the coal, and produced iron metal. That doesn't seem to work for the Putorana stuff, as the basalt is too rich in iron -- if iron had been smelted out of it, the basalt would be poor in iron. My current guess is that the iron metal came from iron sulfide liquid. There's a lot of iron sulfide ore in the Putorana/Noril'sk area, so having sulfide is not a problem. Perhaps the sulfide could get roasted naturally, and drive the sulfur off into the air. The iron would be left behind as metal. Just an idea. Perhaps our Russian friends know more about Putorana?? Cheers! Allan Allan H. Treiman Lunar and Planetary Institute 3600 Bay Area Boulevard Houston TX 77058-1113 281-486-2117 281-486-2162 FAX [EMAIL PROTECTED] -Original Message- From: Dave Harris [mailto:[EMAIL PROTECTED]] Sent: Saturday, February 23, 2002 3:17 AM To: metlist Subject: [meteorite-list] puzzling Putorana Hi there, I have just read Mr. Norton's article in this quarter's Meteorite magazine on Putorana where he speculated that the iron in the basalt was derived from mantle plumes conducting iron from the core to the magma chambers in the lithosphere - I was just wondering how actually plausible that mechanism actually was. I thought that a more likely scenario for the creation of Putorana iron may have been the effect of a magmatic plume coming into contact with a highly carbonaceous sedimentary deposit and the iron compounds are then reduced to native iron (much in the same way that commercial iron is produced by reacting with coke). I accept that the sedimentary deposits would have to be subducted to quite some depths before the appropriate temperature and pressures arose, but it still seems more likely a scenario to me than a outer liquid core streamer of iron travelling a couple of thousand kilometres upwards, against gravity and still keeping the iron in a liquid enough state to mix with magma. Any ideas? I wonder if there is any overriding chemical evidence that the iron is sourced from the core rather than liberated as part of a reduction of mantle silicates and oxides (possibly the presence of Ni in the iron is the evidence that supports the core theory - I dunno!) Don't laugh at me if I have written a load of rubbish here! I need to learn and only by thinking about this stuff and making gaffs will I learn anything - some of you people out there know more about Geology than I will EVER learn, so I bow to your undeniably profound knowledge!!! Ideas/opinions please! -- In gentle decay, dave IMCA #0092 [EMAIL PROTECTED] (for IMCA member contact) http://www.meteorites.ic24.net/index.html http://www.meteoritecollectors.org I have a proof that x^n+y^n=z^n never has integer solutions for n2. However, it won't fit into my signature file __ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list __ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list __ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Zagami Olivine crystals wanted.
Hi All, I was hoping someone on this list may be able to help me with a nice pale coloured, small piece of Zagami. I'm just after a piece around 2-3mm x 2-3mm. I'm also looking for 3 Olivine crystals from one of the stony-irons around 5x5ish mm. Preferably fairly translucent. If anyone can help, could you please email me off-list and let me know what you have available. Thanks, Jeff http://movies.yahoo.com.au - Yahoo! Movies - Vote for your nominees in our online Oscars pool. __ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list
