NWA 17849 ( 20,170 g )

Northwest Africa 17849 (NWA 17849)
(Northwest Africa)
Purchased: 2025 Apr
Classification: Ureilite
History: The meteorite was purchased from a Moroccan dealer at the meteorite fair in Ensisheim, France.
Physical characteristics: Brownish rock with some fusion crust.
Petrography: Protogranular aggregate composed of up to 2.5 mm angular to subrounded olivine and less abundant pigeonite crystals often joining at 120° grain boundaries. Olivine and pyroxene display characteristic reduced rims. The meteorite contains graphite, troilite, and partly altered kamacite.
Geochemistry: olivine cores: Fa20.5±0.1 (Fa20.4-20.7, n=10), contain 0.74±0.15 wt% Cr2O3 and 0.39±0.10 wt% CaO; reduced rims in olivine: Fa2.5-4.6, n=3; pyroxene: Fs17.3±0.1Wo9.1±0.1 (Fs17.1-17.4Wo8.9-9.3, n=15), contains 1.23±0.03 wt% Cr2O3 and 0.81±0.05 wt% Al2O3; reduced rims in pyroxene: Fs9.0-10.6Wo8.4-8.7
 
Place of purchase: Erfoud, Morocco
Date: P 2025 Apr
Mass (g): 375
Pieces: 1
Class: Ureilite
Shock stage: low
Weathering grade: moderate
Fayalite (mol%): 20.5
Ferrosilite (mol%): 17.3
Wollastonite (mol%): 9.1
Classifier: A. Greshake, MNB
Type spec mass (g): 25.6
Type spec location: MNB
Main mass: Hanno Strufe
Comments: Submitted by Ansgar Greshake