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JMDMT #1275 Microfossils of Cyanobacteria in Carbonaceous Meteorites

The James M. DuPont Meteorite Collection - primary groundmasses, often with hedenbergite, and ferroan olivine (Fo(sub)45-62) replacing enstatite phenocrysts. Olivine phenocrysts among the altered groundmasses, show distinct normal zoning, ranging from Fo(sub)99-62. The ferroan olivine rims were not equilibrated with coexisting high- and low-Ca pyroxene phenocrysts with atomic Mg/Mg + Fe rations of 0.99-0.98. Therefore, the zoning was secondarily formed in the way similar to olivines in Allende chondrules [1]. Several chondrules in Efremovka contain nepheline replacing primary groundmasses. A chondrule in Efremovka includes sodalite and hedenbergite, and another chondrule contains anhedral olivine grains of Fo(sub)15-24 with nepheline, which are the most FeO-rich olivines among

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