from The Meteoritical Bulletin, No. 111
Northwest Africa 15374 (NWA 15374)
Lunar meteorite (melt breccia)
History: Purchased by Mark Lyon from a meteorite dealer in northwest Africa in 2020.
Physical Characteristics: Single stone with minor fusion crust.
Petrography: (D. Sheikh, Cascadia) Specimen is a polymict breccia comprised of sub-angular to sub-rounded mm-sized lithic and monomineralic clasts (up to ~3 mm) set within a dark, melt-rich matrix. Lithic clast lithologies identified include: anorthosites, impact-melt-rich clasts, dunites, olivine gabbronorites, norites, and noritic anorthosites. Accessory mineral phases include ilmenite and chromite (some Ti-bearing).
Geochemistry: Olivine (Fa33.9±14.4, range Fa5.9-48.4, Fe/Mn=89±12, n=14), Low-Ca Pyroxene (Fs22.6±9.3Wo3.3±0.4, range Fs14.7-40.6Wo2.6-3.9, Fe/Mn=50±5, n=7), Pigeonite (Fs31.3±8.6Wo14.7±5.1, range Fs19.3-50.6Wo7.1-23.4, Fe/Mn=50±4, n=19), High-Ca Pyroxene (Fs25.6±9.2Wo33.0±6.2, range Fs13.3-37.3Wo26.7-41.7, Fe/Mn=47±12, n=5), Calcic Plagioclase (An96.4±0.6, range An95.4-97.8, n=24).
Classification: Lunar (melt breccia).
Specimens: 20.35 g at Cascadia, main mass with Mark Lyon.
I have not studied Northwest Africa 15374.
Meteoritical Bulletin Database