NWA 998 (Mars meteorite, SNC, Nakhlite)
Fragment
Weight: 0.590g
Size: 8 x 7 x 6 mm
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Meteorite name : NWA 998
Type : Martian Meteorite, Nakhlite, SNC
Country : North West Africa
Date of find : Purchased september 2001 ?
Tkw : 456g
Northwest Africa 998
Purchased 2001 September
Classification and mineralogy (A. Irving and S. Kuehner, UWS): a friable, dark green rock with minor orange-brown alteration products that probably are of pre-terrestrial origin. Composed mainly of subhedral, olive-green, complexly-zoned subcalcic augite (Fs22Wo39) with subordinate yellow olivine (Fa64), orthopyroxene (Fs49Wo4), interstitial plagioclase (Ab61Or4 containing 0.1 wt.% SrO, and exhibiting normal birefringence), titanomagnetite, chlorapatite and pyrrhotite. The overall texture is that of a hypabyssal, adcumulate igneous rock, and the apparent crystallization sequence is olivine, orthopyroxene, titanomagnetite, augite, apatite, plagioclase.
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