biotite gneiss

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.