Gneiss biotite-amphibole

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