NWA 13336 (24,302 g)

Northwest Africa 13336 (NWA 13336)
(Northwest Africa)
Purchased: 2020
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
Date:
P 2020
Mass (g):
290
Pieces:
1
Class:
CR2
Shock stage:
S1
Weathering grade:
W2
Fayalite (mol%):
1.3; 28.3
Ferrosilite (mol%):
2.8
Wollastonite (mol%):
0.5
Classifier:
A. Greshake, MNB
Type spec mass (g):
20
Type spec location:
MNB
Main mass:
Philippe Schmitt-Kopplin
Comments:
Submitted by Ansgar Greshake