NWA 7317

Find, 2012
Carbonaceous chondrite, CR6
Complete piece with a window, 88g

Remarks: partially coated with black fusion crust

History:
Purchased by Marcin Cimala and Tomek Jakubowski from two separate dealers in Erfoud and Zagora in 2012 April and June

Physical characteristics:
Four fresh, pale greenish stones (122 g, 151 g, 187 g, 636 g), all partially coated with black fusion crust.

Petrography:
(A. Irving and S. Kuehner, UWS) Overall poikiloblastic texture, but there are rare BO chondrules with annular olivine rims. Minerals present include olivine (some as larger grains), orthopyroxene, minor clinopyroxene, intermediate plagioclase, fresh kamacite, chromite, troilite, and merrillite.

Classification:
Carbonaceous chondrite (CR6). This specimen is a highly equilibrated CR chondrite paired with NWA 2994, NWA 3250, NWA 6901 and NWA 6921.

Specimen description:
Pieces have fresh black crust.