Granite

Rock type: 
Age: 
251 millions years

Russia, Altai, mount Round. Belokurikhinsky granite massif. Porphyry biotite granites. Medium grained. Porphyry phenocrysts - microcline. Consist: microcline - 35-65%, plagioclase - 10-30%, quartz 20-30% biotite - 4-7%. Accessory: magnetite, zircon, apatite, muscovite. Upper Permian - Low Triassic.

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