from The Meteoritical
Bulletin, No. 108
Northwest Africa 12839
Purchase: 2019 June
Mass: 68.75 g
by Ben Hoefnagels in June 2019 from a dealer in Agadir, Morocco.
Irving, UWS and P. Carpenter, WUSL) Diabasic
texture (mean grainsize 0.5 mm). Composed primarily of zoned clinopyroxene
and maskelynite with accessory blade-like ilmenite, very sparse zoned
olivine (~3 vol.%), Cr-Ti oxides, baddeleyite, probable zirconolite,
troilite, merrillite, silica polymorph, fayalite and hedenbergite. Dark
shock glass is present in pockets (vesicular) and as cross-cutting
augite (core Fs28.8Wo26.3, FeO/MnO = 50; rim Fs72.4Wo23.6,
FeO/MnO = 77), augite (core Fs21.2Wo38.7, FeO/MnO =
47; rim Fs81.5Wo17.7, FeO/MnO =81), pigeonite (core Fs41.8Wo12.9,FeO/MnO
= 65; rim Fs69.8Wo22.4, FeO/MnO = 77), olivine cores
(Fa37.6-39.5, FeO/MnO = 92-94, N = 3), olivine rims (Fa54.1-68.2,
FeO/MnO = 93-110, N = 3), fayalite (Fa99.2, FeO/MnO = 95),
maskelynite (An87.5-88.2Or0.3, N = 2).
(mare diabase, clinopyroxene-rich, olivine-poor).
g including one polished thin section at UWB; remainder with Mr. B.