sericite

Россия, Хабаровский край, водораздел реки Подохоренок и Вторая Седьмая. Гранитный массив. Биотитовые двуслюдяные граниты - серые крупнозернистые и среднезернистые породы с гипидиоморфной структурой. Основными породообразующими минералами являются калиевый шпат (30-50%), плагиоклаз (10-35%), темноцветные минералы (5-10%) и кварц (20-35%). Акцессорные минералы представлены апатитом, цирконом и рудными минералами. Вторичные минералы - мусковит, хлорит и серицит. Спектральный анализ гранитов выявил следующие примесные элементы; Mn, Ni, Ti, V, Cr, Cu, Pb, реже Mo, Sn и Zr.

Russia, Komi Republic, Subpolar Ural, upper reaches of the Little Lemva river. Gray-green siltstones. Consist: quartz, feldspar, sericite, chlorite. Accesory: hematite, magnetite, leicocsen, zircon, epidote. Fossil: Aristocystites (?) sp., Fascicrinus cf. foliacens Mil sp. nov., Pentagonocyclicus cf. concentricus Yelt., Veryhachium trisulcum Downie Baltisphaeridium longispinosum Ets. Pogureyskaya series. Cambrian (Furongian) - Lower Ordovican (Tremadocian).

Russia, Subpolar Ural, Kozhim river valley. White, light gray marbled limestones. Include microlayers of quartz-mica composition, the content of quartz grains in them sometimes reaches 30–35%. Under the microscope of the rock, a granoblastic structure with relics of an uneven-grained - blastopsammite and blastoaleurite is found; layered, banded texture and consist of a calcite heterogeneous aggregate (70–99%) with intercalations of quartz grains (up to 25%) and microlayers of carbonaceous-chlorite-sericite, muscovite-chlorite composition.

Russia, Khanty-Mansiysk autonomous okrug, Subpolar Ural, Petravozh creek. Gray-green siltstones, sandstones with dykes gabbro. Sedimentary rocks consist: quartz, feldspar, sericite, chlorite. Accesory: hematite, magnetite, leicocsen, zircon, epidote. Fossil: Aristocystites (?) sp., Fascicrinus cf. foliacens Mil sp. nov., Pentagonocyclicus cf. concentricus Yelt., Veryhachium trisulcum Downie Baltisphaeridium longispinosum Ets. Pogureyskaya series. Cambrian (Furongian) - Lower Ordovican (Tremadocian). Dykes gabbro: Upper Ordovican - Lower Silurian.

Russia, Komi Republic, Subpolar Ural, upper reaches of the Little Lemva river. Gray-green siltstones. Consist: quartz, feldspar, sericite, chlorite. Accesory: hematite, magnetite, leicocsen, zircon, epidote. Fossil: Aristocystites (?) sp., Fascicrinus cf. foliacens Mil sp. nov., Pentagonocyclicus cf. concentricus Yelt., Veryhachium trisulcum Downie Baltisphaeridium longispinosum Ets. Pogureyskaya series. Cambrian (Furongian) - Lower Ordovican (Tremadocian).

Russia, Chita region, Pogromnoye gold deposit. Albite-sericite-quartz metasomatite with quartz and carbonate-quartz veins and interspersed with arsenopyrite. Gold ore. Gold - 8.3 g/t. Upper Jurassic.

Russia, Irkutsk region, the upper reaches of the creek of Alexander Nevsky, gold deposit - "Nevskoe". Quartz sandstones with quartz and quartz-arbonatic veins. Fine grained. Cement - quartz-sericite, with carbonaceous matter. Aunakitskaya series. Host rocks for gold ore mineralization of the Nevskoye deposit. Paleoproterozoic.

Russia, Irkutsk region, Kadali river valley. Marbles of the Imnyakhskoy series. Light gray, greenish-bluish-gray, fine-grained. Granoblast structure, massive texture. Consist: calcite. Accessory: quartz, sericite, muscovite. Paleoproterozoic.

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.

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.