» » » NWA 7317 (1.11 gram)

NWA 7317 (1.11 gram)

77 $

In stock

[ Meteoritical Bulletin Database ]


Classification: Carbonaceous chondrites CR6 W0/1 / S2
Place/Time: 2012 in Morocco
Mass: 1096g

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.
Geochemistry: Olivine (Fa38.0-38.2, FeO/MnO = 72-79), orthopyroxene (Fs29.3-29.4Wo3.3-3.0, FeO/MnO = 53-61), clinopyroxene (Fs12.8-14.2Wo42.7-40.5, FeO/MnO = 40-41). Oxygen isotopes (R. Tanaka, OkaU): analyses of acid-washed subsamples by laser fluorination gave δ17O = 0.057, 0.064; δ18O = 3.507, 3.594; Δ17O = -1.788, -1.827 per mil.
Classification: Carbonaceous chondrite (CR6). This specimen is a highly equilibrated CR chondrite paired with NWA 2994, NWA 3250, NWA 6901 and NWA 6921.

NOTE: Slices cut from last 121g specimen. This is my last material (99 grams) + 45g full slice from largest specimen. Slices perfectly polished.