Northwest Africa 13769 (NWA 13769)
Classification: Carbonaceous chondrite (CO3)
History: The meteorite was purchased from a dealer in Errachidia, Morocco.
Physical characteristics: Grayish fragment partly covered by fusion crust.
Petrography: The meteorite shows a grayish interior and is predominantly composed of abundant small chondrules, CAIs, and mineral fragments set into a fine-grained matrix. Chondrules have a mean diameter of about 0.2 mm. Few chondrules are surrounded by fine-grained rims. Opaque phases are partly altered metal and troilite. Some regions show brownish staining due to terrestrial weathering.
Place of purchase: Errachidia, Morocco
Date: P 2020
Mass (g): 761
Shock stage: S1
Weathering grade: low
Fayalite (mol%): 18.8±16.1 (0.4-36.9, n=18)
Ferrosilite (mol%): 2.4±1.1 (1.3-5.7, n=14)
Wollastonite (mol%): 0.9±0.1 (0.6-1.1, n=14)
Magnetic suscept.: 4.3
Classifier: A. Greshake, MNB
Type spec mass (g): 24.2
Type spec location: MNB
Main mass: Tomasz Jakubowski
Comments: Submitted by Ansgar Greshake