NWA 7157, Recrystallized LL7 Chondrite, Micromount

$5.00

Description

NWA 7157 was first recovered as a single stone out of the Saharan Desert of Morocco in 2011. The find consisted of one small stone weighing 120 grams. It was analyzed at the University of Washington and classified as a LL7 chondrite. It is lightly weathered  W1/2 and only mildly shocked at S2. Like all LL7 chondrites, this meteorite shows no chondrules. It has a crystallized matrix that resembles a brachinite or lodranite. 

Refer to the photo. The black centimeter cube is shown for scale and is not included. You are purchasing a single small fragment like the one shown. Your purchase will include a labled gemjar for safe storage.

From the Meteoritical Bulletin entry on NWA 7157 :

Northwest Africa 7157 (NWA 7157)

(Northwest Africa)

Purchased: 2011

Classification: Ordinary chondrite (L7)

History: Purchased by Marcin Cimala in 2011 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Recrystallized with triple grain junctions. Equigranular aggregate of olivine, orthopyroxene, sodic plagioclase, clinopyroxene, chromite, troilite and metal.

Geochemistry: Olivine (Fa22.6-22.7, N = 3), orthopyroxene (Fs18.8-19.1Wo2.8-3.1, N = 3), clinopyroxene (Fs7.7-8.1Wo44.1-42.6, N = 2).

Classification: Ordinary chondrite (L7).