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• W1609889263 abstract "Petrography: NWA 5131 is a 533 gram achondrite previously thought to have affinities with LL chondrites (based largely on its olivine composition); however, new oxygen isotopic data clearly indicate that it is instead related to CR chondrites, and is in many ways quite similar to Tafassasset. The specimen is an inequigranular metamorphic aggregate of olivine (62 vol.%, Fa29.3, FeO/MnO = 68), orthopyroxene (28 vol.%, Fs24.7Wo2.1), and metal (5 vol.%) with accessory clinopyroxene, intermediate plagioclase, chromite (cr# 82) and troilite. Finer grained portions consist of polygonal grains meeting at 120o junctions, but there also are regions with poikiloblastic texture. Orthopyroxene poikiloblasts up to 4mm across enclose smaller chadacrysts of olivine and metal. No chondrules can be distinguished, but the poikiloblastic texture may represent former chondrule regions that have been highly recrystallized. Oxygen isotopes: Results obtained by laser fluorination of acid-washed material (δ 18 O = 2.12, 2.10; δ 17 O = 0.42, -0.45; Δ 17 O = -1.536, -1.555 per mil, respectively) plot well below the" @default.
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• W1609889263 date "2011-09-01" @default.
• W1609889263 modified "2023-09-23" @default.
• W1609889263 title "Northwest Africa 5131: Another Tafassasset-Like Metachondrite Related to the CR Chondrite Parent Body" @default.
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