BUCHWALD V.F. (1975) Handbook of Iron Meteorites (Vol. 2, 573-575, excerpts):
- polycrystalline, medium octahedrite with silicate-graphite inclusions - anomalous, Group I - 9.24% Ni, 0.54% Co, 0.15% P, 0.2% C - 49 ppm Ga, 179 ppm Ge, 2 pprn Ir (for the metal phase) - a mass of 25 kg was said to have been found - shape of the meteorite was compared to a water-worn boulder with the extreme dimensions 26 x 26 x 16 cm - upon cooling crystals developed an independent Widmanstätten structure - some grain boundaries are loaded with 0.5-1 mm wide troilite and schreibersite veins - kamacite shows indistinct Neumann bands - some plessite fields have central areas of poorly defined haxonite* - graphite is an important constituent - schreibersite occurs as skeleton crystals and as grain boundary precipitates - troilite is very common as grain boundary fillings and as fillings between the silicate- and graphite grains - troilite is shock melted and solidified - silicates occupy about 15% by area (olivines, pyroxenes, feldspar) - mineral assemblage similar to that of Campo del Cielo - Four Corners shows a certain structural analogy to Copiapo - metallic portion of Four Corners related to Balfour Downs and Colfax - silicate portion related to Balfour Downs and Campo del Cielo *haxonite = (Fe,Ni)23C6 Best regards, Bernd ______________________________________________ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list