アメリカ自然史博物館のインスタグラム(amnh) - 4月25日 06時09分

This rock solidified from a basaltic magma within a few hundred meters of the surface, probably beneath a volcano. It cooled rapidly, giving it a fine-grained, peppery appearance. The black mineral is pyroxene, and the white one is plagioclase. #MineralMonday #insideamnh #amnh

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