LOW PRICE!!!
WORLD CLASS!!!
MUSEUM QUALITY NWA 7397 METEORITE!!!
MARTIAN SHERGOTTITE FROM SMARA MOROCCO!!!
LARGE FABULOUS FRESH FRAGMENT WITH FUSION CRUST!!!
Find: July 18th, 2011!!!
Type: Martian Shergottite, Poikilitic!!!
TKW: Multiple Kilos!!!
Location: Smara, Morocco!!!
Specimen weight: 11.3 grams!!!
Specimen Type: Fragment!!!
Northwest Africa 7397 (NWA 7397)
Northwest Africa
Purchased: 2012 Jun
Classification: Martian meteorite (Shergottite)
Physical characteristics: A 2130 g, partially covered in fusion crust. Interior larger ovoid crystals in a finer grained matrix.
Petrography: (A. Irving and S. Kuehner, UWS) Large oikocrysts (up to 1.5 cm across) of low-Ca pyroxene enclose multiple chadacrysts of olivine and Cr-rich chromite. Relatively equigranular domains between oikocrysts are composed of low-Ca and high-Ca pyroxene (showing very limited compositional zoning), maskleynite and olivine with accessory merrillite, Ti-chromite, pyrrhotite and ilmenite (with associated grains of baddeleyite up to 10 μm across). Olivine contains sparse melt inclusions composed of K-Na-Al-Si-rich glass surrounded by characteristic post-shock radial expansion microfractures.
Geochemistry: Olivine (Fa38.9-40.7; FeO/MnO = 47-54), orthopyroxene (Fs30.3Wo3.3; FeO/MnO = 36), pigeonite (Fs25.1-27.6Wo6.6-10.0; FeO/MnO = 28-33), subcalcic augite (Fs17.0-19.0Wo35.1-35.4; FeO/MnO = 22-25). Bulk trace element composition (G. Chen, UAb): analysis by ICP-MS of clean wire-saw cutting dust gave (in ppm) La 1.66, Ce 4.48, Nd 2.93, Sm 1.13, Eu 0.3, Gd 1.59, Dy 1.95, Yb 1.02, Lu 0.14, Hf 1.66, Th 1.15, Rb 2.89, Sr 33.6.
Classification: Martian (shergottite, poikilitic).
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