Meteoritical Bulletin, No. 107
Northwest Africa 12008
History: Purportedly found in Morocco and purchased by Ben Hoefnagels
in August 2018 from a dealer in Zagora, Morocco.
Petrography: (A. Irving and
S. Kuehner, UWS) Small olivine
phenocrysts (stained orange-brown) are set in an
intersertal groundmass composed mainly of zoned clinopyroxene and elongate
lath-like maskelynite with accessory skeletal ilmenite, Ti-chromite,
Cr-Ti-Fe spinel, troilite and minor barite. Olivine contains inclusions of
chromite and quenched melt inclusions (surrounded by radial cracks)
composed of Al-Ti-bearing augite + K-bearing glass.
Geochemistry: Olivine (cores
Fa36.6-42.3, rim Fa90.0, FeO/MnO = 96-99, N = 3),
pigeonite (Fs31.1Wo14.0, FeO/MnO = 50), subcalcic
augite (Fs25.9-71.4Wo28.6-23.1, FeO/MnO = 50-75, N =
5), augite (Fs23.2Wo39.7, FeO/MnO = 49),
ferropigeonite (Fs80.1Wo19.5, FeO/MnO = 79), augite
in melt inclusion (Fs28.8Wo50.1, FeO/MnO = 71, Al2O3
= 10.5 wt.%, TiO2 = 5.3 wt.%), plagioclase (An86.8-87.6Or0.4-0.3,
N = 2).
Specimens: 25.2 g including
two polished thin sections at UWB;
remainder with Mr. B. Hoefnagels.