Description
Northwest Africa 11208 (NWA 11208)
Western Sahara
Purchased: 2016 May 25
Classification: Carbonaceous chondrite (CO3.0)
History: Purchased from Abdeltif Mechaguen
Physical characteristics: A dark irregular stone. Cut surface reveals dark interior with small chondrules.
Petrography: Chondrules (mostly type I) and small CAIs in a dark brown matrix. Chondrule mean apparent diameter 170±90 μm (N=40). Abundant metal and associated terrestrial weathering products.
Geochemistry: Olivine Fa18.2±15.7, range 1.1-40.3, PMD 79% (N=8). Ferroan olivine has Cr2O3 0.34±0.05 wt% (N=5). Orthopyroxene Fs3.5±2.5Wo1.0±0.3. Magnetic susceptibility log χ (× 10-9 m3/kg)=4.82.
Classification: CO3.0. Subtype is from the Cr2O3 content of ferroan olivine.
Specimens: type specimen and polished sections at CEREGE. Main mass with Pierre-Marie Pelé.
Mass (g): 160.9
Pieces: 7
Class: CO3.0
Weathering grade: moderate
Fayalite (mol%): 18.2±15.7 (N=8)
Ferrosilite (mol%): 3.5±2.5 (N=5)
Wollastonite (mol%): 1.0±0.3
Magnetic suscept.: 4.82
Classifier: J. Gattacceca, CEREGE
Type spec mass (g): 23.6
Type spec location: CEREGE
Main mass: Pierre-Marie Pelé
Finder: Pierre-Marie Pelé
Comments: work name CC-1601; submitted by Jérôme Gattacceca.
