Biotite (Black Mica)
Biotite (K(Mg,Fe)3AlSi3O10(OH)2)
mineral
Category
Metamorphic (Likely Gneiss Or Schist Based On Texture)
Browse metamorphic (likely gneiss or schist based on texture) specimens identified by the Rock Identifier community.
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Gneiss (specifically Amphibolite Gneiss)
Gneiss
metamorphic
Garnet in Matrix (likely Almandine Garnet)
Almandine (Fe3Al2(SiO4)3)
metamorphic
Schist
Crystalline Metamorphic Rock (Schistose)
metamorphic
Gneiss
Gneiss
metamorphic
Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)
Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.
Metamorphic, Mineral (within a rock type)
Milky Quartz with Garnet/Hematite and Basalt
Silicon Dioxide (SiO2) with Almandine (Fe3Al2Si3O12) and Basalt
mineral
Schist
Mica Schist
metamorphic
Quartzite Pebble
Quartzite (SiO2 based)
metamorphic
Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Red Garnet (Pyrope or Almandine)
Garnet Group (A3B2(SiO4)3)
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Garnet
Garnet Group (Silicate Minerals)
mineral
Diamond Drill Core (Greenschist and Quartzite)
Chlorite Schist / Meta-quartzite (Metamorphic Rock Core Sample)
metamorphic
Gneissic Schist
Gneiss-schist (Metamorphic rock)
metamorphic
Black Tourmaline (Schorl)
Schorl (NaFe2+3Al6(BO3)3Si6O18(OH)4)
mineral
Garnet (Pyrope-Almandine series)
Garnet Group, (Mg,Fe)3Al2Si3O12
mineral
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gneiss
Gneiss (foliated metamorphic rock)
metamorphic
Banded Gneiss
Gneiss (pronounced 'nice')
metamorphic
Gneiss
Gneiss (pronounced 'nice')
Metamorphic Rock
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Mica (likely Muscovite)
Muscovite / KAl2(AlSi3O10)(OH)2
mineral
Foliated schist, likely mica schist
Mica schist; chiefly quartz (SiO₂), muscovite/biotite mica, and feldspar
metamorphic
Quartz with Schist Inclusion
Quartz (SiO2) with micaceous schist inclusions
metamorphic
Biotite Schist (with Garnet and Pyrite)
K(Mg,Fe)3AlSi3O10(OH,F)2 (Biotite focus)
metamorphic
Gneiss
High-grade regional metamorphic Gneiss
metamorphic
Biotite schist (likely graphite-bearing)
Mica schist; chiefly quartz + biotite mica, with possible graphite and feldspar
metamorphic
Gneiss (Metamorphosed Granitic Rock)
Gneiss (composed mainly of quartz, feldspar, biotite, and/or hornblende)
metamorphic
Quartz Vein in Gneiss or Schist
Metamorphic rock with SiO2 vein
metamorphic
Quartz Vein in Gneiss or Schist
Silicon dioxide (SiO2) within metamorphic host rock
metamorphic
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Blue Sapphire (Faceted)
Corundum (Al2O3)
gemstone
Rough Sapphire (Corundum)
Corundum (Al2O3)
mineral
Gneiss (with Granite/Pegmatite Vein)
Foliated Metamorphic Rock (Quartz-Feldspar Gneiss)
metamorphic
Felsic gneiss, likely granitic gneiss
Quartz–feldspar–mica gneiss; commonly quartz + plagioclase/K-feldspar + biotite or hornblende
metamorphic
Banded gneiss pebble
Gneiss, likely quartz–feldspar–mica gneiss
metamorphic
Gneiss
High-grade regional metamorphic rock
metamorphic
Emerald in Matrix
Beryl (Be3Al2Si6O18)
mineral