NWA 12829 (9,360 g)

Northwest Africa 12829 (NWA 12829)
(Northwest Africa)
Purchased: 2019
Classification: Carbonaceous chondrite (CK3)
History: The meteorite was purchased from a local meteorite dealer in Morocco.
Physical characteristics: Several black fragments with some fusion crust.
Petrography: The meteorite displays a dark brownish interior and is composed of several sharply defined chondrules (mean diameter about 900 μm) set into abundant recrystallized matrix. Olivine and low-Ca pyroxene are compositionally zoned in most chondrules and also in some matrix grains. Minor phases include intermediate plagioclase, Ca-pyroxene, and Fe,Ni-sulfides. Cr-rich magnetite is abundant; metal was not detected.
Geochemistry: olivine: Fa24.6±11.9 (Fa1.1-33.6, FeO/MnO= 139±17, n=25); low-Ca pyroxene: Fs12.9±10.2Wo1.5±1.2 (Fs1.4-26.5Wo0.9-4.4, n=20); Ca-pyroxene: Fs1.7±0.1Wo33.4±1.2, n=5; feldspar: An61.1±1.3Ab37.7±1.2Or1.3±0.1, n=6
 
Place of purchase: Morocco
Date: P 2019
Mass (g): 19 + 500
Pieces: several
Class: CK3
Shock stage: S2
Weathering grade: moderate
Fayalite (mol%): 24.6
Ferrosilite (mol%): 12.9; 1.7
Wollastonite (mol%): 1.5; 33.4
Classifier: A. Greshake, MNB
Type spec mass (g): 4
Type spec location: MNB
Main mass: Philippe Schmitt-Kopplin
Comments: Submitted by Ansgar Greshake