biotite

Rock type: 
Age: 
87 millions years

Russia, Khabarovsk territory, Khekhtsir range. Korfovsky massif granodiorite porphyry. Gray, medium and coarse-grained rocks. Consist: plagioclase, K-spar, amphibole, pyroxene, biotite. Upper Cretaceous.

Rock type: 
Age: 
87 millions years

Russia, Khabarovsk territory, Khekhtsir range. Korfovsky massif granodiorite porphyry. Gray, medium and coarse-grained rocks. Consist: plagioclase, K-spar, amphibole, pyroxene, biotite. Upper Cretaceous.

Rock type: 
Age: 
251 millions years

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.

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.

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.

Rock type: 
Age: 
251 millions years

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.

Rock type: 
Age: 
97 millions years

Russia, Khabarovsk Territory. Stock diorite porphyrites. Butakano-Churkinsky complex. Greenish-gray and dark gray with a greenish tint porphyry rocks with a different number of plagioclase phenocrysts in the microcrystalline bulk consisting of a plagioclase sheet, chlorinated biotite flakes and hornblende. Plagioclase phenocrysts are represented by zonal andesine tablets, sometimes albitized along cracks. The hornblende, also present in phenocrysts, is represented by idiomorphic grains 1 × 2.5 mm in size. In the second photo, magnification * 10. Upper Cretaceous.

Rock type: 
Age: 
97 millions years

Russia, Khabarovsk Territory. Stock diorite porphyrites. Butakano-Churkinsky complex. Greenish-gray and dark gray with a greenish tint porphyry rocks with a different number of plagioclase phenocrysts in the microcrystalline bulk consisting of a plagioclase sheet, chlorinated biotite flakes and hornblende. Plagioclase phenocrysts are represented by zonal andesine tablets, sometimes albitized along cracks. The hornblende, also present in phenocrysts, is represented by idiomorphic grains 1 × 2.5 mm in size. In the second photo, magnification * 10. Upper Cretaceous.

Rock type: 
Age: 
120 millions years

Russia, Magadan region, cape Chirikova. Magadan massif of granodiorites. Size - 40 * 45 km. Granodiorites hornblende-biotite. Consist: andesine 50%, anorthoclase 15%, quartz 20%, biotite 7%, green hornblende 5%, monoclinic pyroxene 0,5%. Accessory: chlorite, epidote, zoisite, sphene, zircon, apatite, magnetite. Low Cretaceous.

Rock type: 
Age: 
120 millions years

Russia, Magadan region, cape Chirikova. Magadan massif of granodiorites. Size - 40 * 45 km. Granodiorites hornblende-biotite. Consist: andesine 50%, anorthoclase 15%, quartz 20%, biotite 7%, green hornblende 5%, monoclinic pyroxene 0,5%. Accessory: chlorite, epidote, zoisite, sphene, zircon, apatite, magnetite. Low Cretaceous.