[meteorite-list] AD - NWA 6167 (Ungrouped Silicated Ataxite), 68.44g Main Mass, low price...

From: Fabien Kuntz <wwmeteorites_at_meteoritecentral.com>
Date: Tue, 2 Apr 2013 01:42:16 +0100 (BST)
Message-ID: <1364863336.74788.YahooMailNeo_at_web172603.mail.ir2.yahoo.com>

Hello,


I offer to sale the 68.44g main mass of my ungrouped ataxite NWA 6167 (Co = 0.929%, Ni = 19.0%) . The specimen is the "nose" of this perfect oriented iron, less than ten complete slices have been produced, and sold (mostly Ensisheim 2011).


All offers over 1025$ (15$/g) are welcome for the next 48 hours...


http://www.wwmeteorites.com/NWA6167-68.44g-MainMass-01.JPG
http://www.wwmeteorites.com/NWA6167-68.44g-MainMass-02.JPG
http://www.wwmeteorites.com/NWA6167-68.44g-MainMass-03.JPG
http://www.wwmeteorites.com/NWA6167-68.44g-MainMass-04.JPG
http://www.wwmeteorites.com/NWA6167-68.44g-MainMass-05.JPG



Physical characteristics: The 500 g mass, measuring about 7 ? 4 ? 4 cm, has a bullet-shaped morphology with some regmaglypts and remnants of the fusion crust.
Petrography: (M. D?Orazio, M. Gemelli, DST-PI) Etched sections show an ataxitic texture. Under high magnification the
metal shows a very fine (1-5 ?m) intergrowth of kamacite and taenite
arranged into a micro-Widmanst?tten pattern. Small globular inclusions
(to 2 mm) of sulfide-rich material are scattered in the metal. These
inclusions are made of a heterogeneous intergrowth of very small (1-10
?m) crystals of kamacite, taenite and schreibersite with interstitial
troilite. Some of these inclusions also host small euhedral elongated
crystals of chromite. The studied 16.5 cm2 surface contains five rounded silicate inclusions (to 6.8 mm). They consist of prevailing crystals of olivine (Fo79.6?0.6), low-Ca pyroxene (En78-80 Wo2.2-3.1), high-Ca pyroxene (En49-51 Wo41-42), plagioclase (An78-85), Ca-phosphate and chromite.Close to the boundary with the Fe-Ni metal, the silicate crystals are crossed by tiny veinlets of very fine-grained Fe-Ni metal+troilite or iron
oxyhydroxides.
Geochemistry: Composition of the metal (ICP-MS; D?Orazio and Folco, 2003) is: Co = 0.929, Ni = 19.0 (both in wt%), Cu = 302, Ga = 11.3, Ge =
51.4, As = 14.5, W = 2.68, Re = 1.73, Ir = 18.7, Pt = 26.4, Au = 1.12
(all in ppm). Reference: D?Orazio, M. and Folco, L. (2003). Chemical
analysis of iron meteorites by inductively coupled plasma - mass
spectrometry. Geostandards Newsletter, 27, 3, 215-225.
Classification: Iron meteorite (silicated), Ni-rich ataxite, ungrouped, very low weathering grade.


And do not forgot my ebay sales :


http://www.ebay.com/sch/wwmeteorites-25/m.html?_dmd=1&_ipg=50&_sop=12&_rdc=1


Fabien
Received on Mon 01 Apr 2013 08:42:16 PM PDT