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12075 (26) - Olivine basalt

12075 is a vuggy, medium-grained olivine basalt with olivine and pyroxene phenocrysts set in a variolitic groundmass. It had also been described as an olivine dolerite cumulate. This is a medium-grained basic igneous rock in which pyroxenes (about 20%) and olivine (20%) phenocrysts (lengths ~3…

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