biotite

Rock type: 
Age: 
86 millions years

Russia, Khabarovsk Territory. Quartz diorite porphyry. Upper Cretaceous. Consist: quartz 10-15%, plagioclase 60-65%, hornblende 15-25%, biotite up to 5%. Plagioclase - andesine or labrador-andesine. Accessory: magnetite, apatite, sphene.

Rock type: 
Age: 
57 millions years

Russia, Khabarovsk Territory. Dyke alaskite granite. Paleocene. Consist: quartz 30-38%, K-spar 40-55%, plagioclase 15-25%, biotite up to 3%. Plagioclase - oligoclase, rare - oligoclase-albite, albite. Accessory: magnetite, zircon, apatite, monazite. Silicate analysis: SiO2 74-77%, TiO2 0.1-0.2%, Al2O3 13-14%, Fe2O3 0.3-0.5%, FeO 0.7-1.6%, MnO 0.01-0.04%, MgO 0.1-0.3%, CaO 0.2-0.5%, Na2O 2.7-3.4%, K2O 4%, SO3 0%, P2O5 0-0.03%, CO3 0-0.4%.

Rock type: 
Age: 
148 millions years

Russia, Karachay-Cherkess Republic, Honey waterfalls. Layered dolomitic limestones with siliceous nodules containing horizon. In limestones, a large number of bryozoans, brachiopods and pelecipods. Jurassic. Tithonian.

At the bottom of the cliff - granites. Pink biotite granites. Consist: plagioclase, microcline, quartz, biotite, muscovite. Malinskiy granite complex. Carboniferous.

Rock type: 
Age: 
230 millions years

Russia, Khabarovsk Territory, Yagdynya river. Biotite Granites. Form an massif of 850 square kilometers. Consist: oligolclase - 24-32%, microcline - 24-45%, quartz - 15-29%, biotite - 4-11%. Plagioclase forms sericite and albite (auto-metasomatism). Chlorite is formed by biotite. Accessory: sphene, zircon, apatite. Definitions of absolute age (K): 207, 230, 235 million years. Upper Triassic.

Rock type: 
Age: 
230 millions years

Russia, Khabarovsk Territory, Yagdynya river. Biotite Granites. Form an massif of 850 square kilometers. Consist: oligolclase - 24-32%, microcline - 24-45%, quartz - 15-29%, biotite - 4-11%. Plagioclase forms sericite and albite (auto-metasomatism). Chlorite is formed by biotite. Accessory: sphene, zircon, apatite. Definitions of absolute age (K): 207, 230, 235 million years. Upper Triassic.

Rock type: 
Age: 
230 millions years

Russia, Khabarovsk Territory, Yagdynya river. Biotite Granites. Form an massif of 850 square kilometers. Consist: oligolclase - 24-32%, microcline - 24-45%, quartz - 15-29%, biotite - 4-11%. Plagioclase forms sericite and albite (auto-metasomatism). Chlorite is formed by biotite. Accessory: sphene, zircon, apatite. Definitions of absolute age (K): 207, 230, 235 million years. Upper Triassic.

Rock type: 
Age: 
230 millions years

Russia, Khabarovsk Territory, Yagdynya river. Biotite Granites. Form an massif of 850 square kilometers. Consist: oligolclase - 24-32%, microcline - 24-45%, quartz - 15-29%, biotite - 4-11%. Plagioclase forms sericite and albite (auto-metasomatism). Chlorite is formed by biotite. Accessory: sphene, zircon, apatite. Definitions of absolute age (K): 207, 230, 235 million years. Upper Triassic.

Rock type: 
Age: 
97 millions years

Russia, Khabarovsk Territory. Granodiorite biotite-hornblende, fine-grained, medium-grained. Butakano-Churkinsky complex, second phase. 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 × 4 mm in size.

Rock type: 
Age: 
75 millions years

Russia, Primorsky Territory, Mount Pidan. Granodiorite massif. The massif has the shape of an oval elongated in a sub-latitudinal direction. Area 80 km square. Contacts with host rocks - 60-90 degrees. Granodiorites biotite-hornblende, gray, dark gray, medium-grained, fine-grained. Consist: plagioclase 50-60%, quartz 10-15%, orthoclase up to 10%, biotite 10-12%, hornblende 5-15%. Accessory: apatite, zircon, rarely orthite. Upper Cretaceous.