World rocks photo collection
Russia, Altai, rock "Four brothers". 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.
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.
Russia, Altai, mount Tserkovka. 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.