[meteorite-list] Blue Bits in NWA 1584 Chondrules
Hello Darren and List, I was scanning some NWA 1584 slices (one of my favorite meteorites) and I noticed some iridescent-looking blue areas in some of the chondrules on one of them. I looked at the areas with a 20x hand lens and the blue is really there, ... anyone know what is causing this effect? The chondrules (if those are indeed chondrules) are around a centimeter across. http://webpages.charter.net/garrison6328/bluebits1.jpg http://webpages.charter.net/garrison6328/bluebits2.jpg Yes, NWA 1584 is a beautiful, fresh LL5 chondrite -- this is true at least for the specimens the Hupes offered some time ago. Some other specimens that are being offered on EBay right now look more severely weathered. I have a very nice 10.8-gram crusted endcut from the Hupes and, here is what it looks like: It has a grayish matrix with several clasts and chondrules. There is about 60% fresh black fusion crust showing polygonal contraction cracks. A major feature is several large, mostly globular troilite aggregates (up to 5 mm in longest dimension). I looked for those ominous, bluish areas and I found some at high magnification (32x and 56x), although they are not as conspicuous as yours. To me they have a bluish/violet iridescent appearance and when I slowly rotate my specimen under the microscope this iridescence appears and disappears periodically. So it seems that this is (at least in my specimen) light reflected off mineral grains (troilite, and, well, maybe chromite or ilmenite). Darren, I'm going to attach three NWA 1584 JPEGs in separate mails to you so that you see what I am talking about. One of these JPEGs shows a 5 mm troilite inclusion (magnification 32x), #2 shows four of these violet/blue things (magnification 32x) and another is a wide-angle pic of my specimen (also showing this conspicuous 5 mm troilite inclusion at the upper left). Best wishes, Bernd __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Blue Bits in NWA 1584 Chondrules
Hi Darren and List, Blue. Now that is interesting. I must say, I don't recall ever seeing blue coloration in chondrites. I have seen pink in Allende but this is a first for blue. Thanks for sharing the pictures. Bernd, if you wouldn't mind, would you please mail those pics to me as well. I would like to see them. -Walter Branch - - Original Message - From: [EMAIL PROTECTED] To: Meteorite-list@meteoritecentral.com Sent: Saturday, January 29, 2005 8:14 AM Subject: [meteorite-list] Blue Bits in NWA 1584 Chondrules Hello Darren and List, I was scanning some NWA 1584 slices (one of my favorite meteorites) and I noticed some iridescent-looking blue areas in some of the chondrules on one of them. I looked at the areas with a 20x hand lens and the blue is really there, ... anyone know what is causing this effect? The chondrules (if those are indeed chondrules) are around a centimeter across. http://webpages.charter.net/garrison6328/bluebits1.jpg http://webpages.charter.net/garrison6328/bluebits2.jpg Yes, NWA 1584 is a beautiful, fresh LL5 chondrite -- this is true at least for the specimens the Hupes offered some time ago. Some other specimens that are being offered on EBay right now look more severely weathered. I have a very nice 10.8-gram crusted endcut from the Hupes and, here is what it looks like: It has a grayish matrix with several clasts and chondrules. There is about 60% fresh black fusion crust showing polygonal contraction cracks. A major feature is several large, mostly globular troilite aggregates (up to 5 mm in longest dimension). I looked for those ominous, bluish areas and I found some at high magnification (32x and 56x), although they are not as conspicuous as yours. To me they have a bluish/violet iridescent appearance and when I slowly rotate my specimen under the microscope this iridescence appears and disappears periodically. So it seems that this is (at least in my specimen) light reflected off mineral grains (troilite, and, well, maybe chromite or ilmenite). Darren, I'm going to attach three NWA 1584 JPEGs in separate mails to you so that you see what I am talking about. One of these JPEGs shows a 5 mm troilite inclusion (magnification 32x), #2 shows four of these violet/blue things (magnification 32x) and another is a wide-angle pic of my specimen (also showing this conspicuous 5 mm troilite inclusion at the upper left). Best wishes, Bernd __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Blue Bits in NWA 1584 Chondrules
On Sat, 29 Jan 2005 09:32:00 -0500, Walter Branch [EMAIL PROTECTED] wrote: Hi Darren and List, Blue. Now that is interesting. I must say, I don't recall ever seeing blue coloration in chondrites. I have seen pink in Allende but this is a first for blue. Thanks for sharing the pictures. Here are the full high resolution scans I made of the whole slices. The one on the far left is the one with the blue areas. Slices are 4.2g, 2.3g, and 2.5g. http://webpages.charter.net/garrison6328/nwa_1584_slices.jpg http://webpages.charter.net/garrison6328/nwa_1584_slices_b.jpg __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Blue Bits in NWA 1584 Chondrules
Hello I have seen blue halite crystal in ZAG. They can give it an overall bluish look. :-) Lars -- Meteoriteforum: http://www.worldofmeteorites.com/ __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Blue Bits in NWA 1584 Chondrules
Bernd and Darren and List, I too have a wonderful end cut of NWA1584 purchased from Dean a while back. I believe Dean was the original dealer of this material. From my end cut I also had a wonderful TS made. This is a very beautiful and fresh meteorite showing large chondrules and clasts and many troilite inclusions in a milky white/grey matrix. My end cut also has a beautiful black and very thin fusion crust with polygonal contraction cracks. Alas, my specimen does not have any of the unique bluish inclusions that either of you have found. Both at 20x and 40x I could not find any hint of these. Congratulations! tett - Original Message - From: [EMAIL PROTECTED] To: Meteorite-list@meteoritecentral.com Sent: Saturday, January 29, 2005 8:14 AM Subject: [meteorite-list] Blue Bits in NWA 1584 Chondrules Hello Darren and List, I was scanning some NWA 1584 slices (one of my favorite meteorites) and I noticed some iridescent-looking blue areas in some of the chondrules on one of them. I looked at the areas with a 20x hand lens and the blue is really there, ... anyone know what is causing this effect? The chondrules (if those are indeed chondrules) are around a centimeter across. http://webpages.charter.net/garrison6328/bluebits1.jpg http://webpages.charter.net/garrison6328/bluebits2.jpg Yes, NWA 1584 is a beautiful, fresh LL5 chondrite -- this is true at least for the specimens the Hupes offered some time ago. Some other specimens that are being offered on EBay right now look more severely weathered. I have a very nice 10.8-gram crusted endcut from the Hupes and, here is what it looks like: It has a grayish matrix with several clasts and chondrules. There is about 60% fresh black fusion crust showing polygonal contraction cracks. A major feature is several large, mostly globular troilite aggregates (up to 5 mm in longest dimension). I looked for those ominous, bluish areas and I found some at high magnification (32x and 56x), although they are not as conspicuous as yours. To me they have a bluish/violet iridescent appearance and when I slowly rotate my specimen under the microscope this iridescence appears and disappears periodically. So it seems that this is (at least in my specimen) light reflected off mineral grains (troilite, and, well, maybe chromite or ilmenite). Darren, I'm going to attach three NWA 1584 JPEGs in separate mails to you so that you see what I am talking about. One of these JPEGs shows a 5 mm troilite inclusion (magnification 32x), #2 shows four of these violet/blue things (magnification 32x) and another is a wide-angle pic of my specimen (also showing this conspicuous 5 mm troilite inclusion at the upper left). Best wishes, Bernd __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Blue Bits in NWA 1584 Chondrules
On Sat, 29 Jan 2005 11:48:07 -0500, tett [EMAIL PROTECTED] wrote: Alas, my specimen does not have any of the unique bluish inclusions that either of you have found. Both at 20x and 40x I could not find any hint of these. After doing those scans, I checked to see if any of the other available pieces appeared to have the blue material, and I found one where the blue was apparent even in the seller's poor photo (and bought it) http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=6506072276 The blue isn't apparent in any other of the pieces they offer on Ebay or on their web site, but they COULD be there and just not show up in the photos. (you can see the other slices on NWA 1584 they have at http://www.rhyniechert.com/meteorites.html -- somebody please buy them before I do, I'm experencing poor impulse control). __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
RE: [meteorite-list] Blue Bits in NWA 1584 Chondrules
Hi List, I have a few blue specks in my slice of Portales Valley. They are nestled in along some of the metallic veins - very strange. Waiting for snow ice in Northern VA. Greg Redfern JPL NASA Solar System Ambassador http://www.jpl.nasa.gov/ambassador/index.html International Meteorite Collectors Association #5781 http://www.imca.cc Member Meteoritical Society http://www.meteoriticalsociety.org/ -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Lars Pedersen Sent: Saturday, January 29, 2005 9:58 AM To: meteorite-list@meteoritecentral.com Subject: Re: [meteorite-list] Blue Bits in NWA 1584 Chondrules Hello I have seen blue halite crystal in ZAG. They can give it an overall bluish look. :-) Lars -- Meteoriteforum: http://www.worldofmeteorites.com/ __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
