Gneiss

Russia, Caucasus, Kabardino-Balkarian Republic, mountain Cheget. Donguzorunskiy metamorphic complex. Mica gneisses, mica schists with andalusite, garnet. Thickness - 1280 meters. Proterozoic, mesoproterozoic.

Russia, Caucasus, Kabardino-Balkarian Republic, mountain Cheget. Donguzorunskiy metamorphic complex. Mica gneisses, mica schists with andalusite, garnet. Thickness - 1280 meters. Proterozoic, mesoproterozoic.

Russia, Caucasus, Kabardino-Balkarian Republic, Adyrsu River Gorge. Gondarayskiy metamorphic complex, verkhnebalkarsky metamorphic subcomplex. Muscovite, biotite, feldspathic, hornblende gneisses; chlorite-hornblende, quartz-hornblende, quartz-tremolite schists; migmatitized gneiss and schists, migmatitis. Sometimes quartzite. Fine-grained, medium-grained. Proterozoic, mesoproterozoic.

Russia, Caucasus, Kabardino-Balkarian Republic, Adyrsu River Gorge. Gondarayskiy metamorphic complex, verkhnebalkarsky metamorphic subcomplex. Muscovite, biotite, feldspathic, hornblende gneisses; chlorite-hornblende, quartz-hornblende, quartz-tremolite schists; migmatitized gneiss and schists, migmatitis. Sometimes quartzite. Fine-grained, medium-grained. Proterozoic, mesoproterozoic.

Russia, Caucasus, Kabardino-Balkarian Republic, Adyrsu River Gorge. Gondarayskiy metamorphic complex, verkhnebalkarsky metamorphic subcomplex. Muscovite, biotite, feldspathic, hornblende gneisses; chlorite-hornblende, quartz-hornblende, quartz-tremolite schists; migmatitized gneiss and schists, migmatitis. Sometimes quartzite. Fine-grained, medium-grained. Proterozoic, mesoproterozoic.

Russia, Caucasus, Karachay-Cherkess Republic, Dombai. Complex of quartz-biotite, quartz-chlorite gneisses and schists. Archean (?).

Russia, Karachay-Cherkess Republic, Dombai. Complex of quartz-biotite, quartz-chlorite gneisses and schists. Archean (?).

Sardinia, Spiaggia della Torre. Micaschists and paragneisses with garnet-oligoclase paragenesis. Paleozoic? Micaschists and paragneisses with garnet-oligoclase paragenesis. With quartz veins and lenses. Paleozoic?

Sardinia, Spiaggia della Torre. Micaschists and paragneisses with garnet-oligoclase paragenesis. Paleozoic?

Russia, Amur Region. Gneiss biotite-amphibole. Diffused interspersed pyrites. Mogochinskaya series. Granulite facies of metamorphism. Consist: amphibole 2-25%, biotite 1-15%, hypersten 0-15%, clinopyroxene 0-5%, plagioclase 20-60%, quartz 15-30%, K-spar 0-53%. Accessory: apatite, zircon, monazite, sphene, rutile, pyrite, magnetite. AR₁^Im