NWA 13336 (3,888 g)
Northwest Africa 13336 (NWA 13336)
Classification: Carbonaceous chondrite (CR2)
History: The meteorite was purchased from a meteorite dealer in Morocco.
Physical characteristics: Light-brownish rock with some fusion crust.
Petrography: The meteorite is a carbonaceous chondrite composed of abundant, often slightly flattened chondrules with an apparent mean diameter of about 800 µm and about 30-40% almost black matrix. Chondrules are mostly of type I but two type II chondrules with highly unequilibrated olivine were observed in the section studied. Some chondrules are metal-decorated typical of CR.
Geochemistry: olivine in type I chondrules: Fa1.3±0.4, Cr2O3: 0.49±0.05 wt%, n=13; low-Ca pyroxene: Fs2.8±0.3Wo0.5±0.6, n=16; olivine in type II chondrules: Fa28.3±9.0 (Fa17.0-46.1, n=9). Matrix analyses yield an average total of 88.1±1.2 wt% (5 µm defocused beam, N=10) suggesting the presence of hydrous minerals.
|Place of purchase:||Morocco|
|Fayalite (mol%):||1.3; 28.3|
|Classifier:||A. Greshake, MNB|
|Type spec mass (g):||20|
|Type spec location:||MNB|
|Main mass:||Philippe Schmitt-Kopplin|
|Comments:||Submitted by Ansgar Greshake|