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Northwest Africa 13500 (NWA 13500)
Purchased: 2020 Jan
Classification: Ordinary chondrite (L(LL)3)
Petrography: (J. Gattacceca, CEREGE) Chondrite with “cluster chondrite” texture [Metzler K., 2015, MAPS 47:2193-2217]. Average apparent chondrule diameter 720±300 µm (n=34).
Geochemistry: Olivine Fa16.9±10.6, range Fa4.5-36.7, Fa PMD = 56%, Cr2O3 0.09±0.13 wt% (n=14). Low-Ca pyroxene Fs14.8±7.7Wo1.5±1.5 (n=5).
Classification: Ordinary chondrite L(LL)3. The L group is favored based on magnetic susceptibility, but neither chondrule size nor magnetic susceptibility can exclude the LL classification. Hence the L(LL) classification. Estimated subtype 3.2-3.5 based on Fa PMD and the Cr2O3 content of ferroan olivine.