Description
Northwest Africa 13887 (NWA 13887)
(Northwest Africa)
Purchased: 2019 Oct
Classification: Carbonaceous chondrite (CO3)
Physical characteristics: A single dark stone broken in two fragments. Cut surface reveals a dark interior with small chondrules.
Petrography: (J. Gattacceca, CEREGE) Chondrite with small chondrules (average apparent diameter ~150 µm) and CAIs set in abundant fine-grained iron rich matrix (43 vol% by point counting, n=175 points). Opaque minerals are metal, troilite and magnetite.
Geochemistry: Olivine Fa17.6±11.8, range Fa1.8-40.8, Cr2O3 = 0.17±0.10 wt% (n=15). Low-Ca pyroxene Fs4.9±3.7Wo1.0±0.1 (n=5).
Classification: Carbonaceous chondrite (CO3)
Specimens: Type specimen at CEREGE. Main mass with Kuntz.
