Description
1.828g fragment. Sold with label/certificate of authenticity.
Northwest Africa 10267 (NWA 10267)
(Northwest Africa)
Purchased: 2013 Sep
Classification: Ordinary chondrite (LL4-7)
History: Purchased by Aras Jonikas in February 2015 from a Moroccan dealer.
Petrography: (A. Irving and S. Kuehner, UWS) Complex breccia composed of relatively large (up to 2.4 mm), well-formed chondrules, angular mineral fragments and a variety of lithic clasts set in a finer grained matrix containing altered metal. Some lithic clasts contain relict chondrules (LL6) whereas others are completely recystallized (LL7). Rare clast types include very dark, fine grained indeterminate lithologies, fragmental breccias, and an aggregate dominated by K-feldspar. Minerals are olivine (equilibrated), orthopyroxene (unequilibrated, except in type 6 and type 7 clasts), augite, sodic plagioclase, chromite, altered kamacite, taenite, calcite and barite. Some chondrules contain very calcic plagioclase (bytownite).
Geochemistry: Olivine (Fa29.0-29.5, N = 3), orthopyroxene (Fs5.4-22.8Wo0.4-3.5, N = 3), clinopyroxene (Fs9.5-9.8Wo44.5-43.3, N = 2).
Classification: Ordinary chondrite (LL4-7 breccia).
Specimens: 25 g including one 2″ by 1.5″ polished thin section at PSF. The main mass is held by Mr. A. Jonikas.
