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 µm) intergrowth of kamacite and taenite arranged into a micro-Widmanstätten 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 µm) 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 ______________________________________________ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list
