NWA 4925 Description (excerpt from Meteoritical Bulletin):
Martian, olivine-phyric shergottite
Purchased 2007 in Morocco
Tkw: 282.3 g
History: The meteorite was found by an anonymous finder in Northwest Africa and bought by the main mass holder in Erfoud, Morocco.
Physical characteristics: One fragment partly covered by fusion crust weighing 282.3 g was found.
Petrography: (A. Greshake, MNB). The meteorite displays a porphyritic texture with large chemically zoned olivine megacrysts set into a fine-grained groundmass composed of pyroxene and maskelynite. Minor phases include chromite, sulfides, phosphates, and small Fe-rich olivines. The olivine megacrysts often contain melt inclusions and small chromites.
Geochemistry: Mineral compositions as determined by EMP: olivine, Fa 27.6-46.8; pyroxene, Fs 20.0-37.7 Wo 3-14.8; maskelynite, An 67-69. Classification: Achondrite (Martian, olivine-phyric shergottite); severely shocked with some melt pockets; moderately weathered.
Specimens: A total of 20.1 g plus one polished thin section are on deposit at MNB.
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