Mica Schist
Mica Schist (KAl2(AlSi3O10)(OH)2 - Muscovite component)
metamorphic
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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Blue Dumortierite Quartz
Dumortierite in Quartz (AlAl6BSi3O18)
metamorphic
Rough Sapphire (Corundum)
Corundum (Al2O3)
mineral
Almandine Garnet
Almandine (Fe3Al2Si3O12)
mineral
Gneiss (likely)
Gneiss
Metamorphic
Rounded granitic/gneissic cobble
Probable granodiorite or orthogneiss; quartz–feldspar–biotite aggregate
igneous
Banded gneiss
Foliated gneiss, likely quartz–feldspar–biotite or amphibole gneiss
metamorphic
Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
metamorphic
Mica
Mica group (often Muscovite or Biotite)
mineral
Biotite-rich schist
Mica schist; predominantly biotite mica (K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂), commonly with quartz and feldspar
metamorphic
Biotite Schist
Biotite Schist (predominantly K(Mg,Fe)3AlSi3O10(OH,F)2)
metamorphic
Fuchsite
Muscovite (chromium-rich), K(Al,Cr)2(AlSi3O10)(OH)2
metamorphic
Quartz-rich metamorphic rock, likely quartzite
Quartzite; predominantly crystalline quartz (SiO₂), possibly with feldspar and mica impurities
metamorphic
Quartzite pebble
Quartzite (SiO2 based)
metamorphic
Kyanite
Kyanite, Al₂SiO₅
mineral
Sandstone, Quartzite, and River Pebbles
Silicon Dioxide (SiO2) based Sedimentary/Metamorphic structures
Sedimentary and Metamorphic
Biotite Mica
K(Mg,Fe)3AlSi3O10(OH)2
Mineral in a matrix (likely quartz or feldspar)
Rounded gray river pebble, likely granite or gneiss
Indeterminate granitic rock; commonly quartz + feldspar + mica, possibly gneissic
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Weathered gray metamorphic rock, likely phyllite or slate
Micaceous quartz–phyllosilicate rock; commonly quartz + muscovite/illite ± chlorite
metamorphic
Quartz-veined metamorphic rock, likely schist or gneiss
Micaceous quartz-feldspar rock; probable mica schist/gneiss with quartz veins
metamorphic
Fuchsite
K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)
mineral
Schist
Schist (Metamorphic Rock)
metamorphic
Banded gneiss (likely garnet-biotite or quartz-feldspar gneiss)
Gneiss; predominantly quartz (SiO₂), feldspar, and dark biotite/amphibole
metamorphic
Mica Schist (with Muscovite)
Muscovite/Quartz Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
Schist (Micaceous Schist)
Micaceous schist (Mainly Muscovite/Biotite mixed with Quartz)
metamorphic
Muscovite Schist
KAl2(AlSi3O10)(OH)2 (Muscovite) in Schist Matrix
metamorphic
Aquamarine
Beryl (Be3Al2Si6O18)
gemstone
Black Tourmaline
Schorl (NaFe2+3Al6(BO3)3Si6O18(OH)4)
mineral
Almandine Garnet
Fe3Al2(SiO4)3
mineral
Biotite Schist (likely)
Biotite Schist (rock), Biotite (mineral)
Metamorphic
Sapphire (Blue)
Corundum (Al2O3)
mineral
Fuchsite
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Corundum
Corundum (Al2O3)
Mineral
Rounded, banded metamorphic cobble
Likely gneiss or foliated quartz-rich metamorphic rock; exact identification is uncertain from the photograph.
metamorphic
Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Fuchsite
K(Al,Cr)2(AlSi3O10)(OH)2
mineral
Mica Schist with Quartz
Mica Schist (primarily Muscovite or Biotite with Quartz)
metamorphic
Rough Sapphire (possibly Yellow/Green Corundum)
Corundum (Al2O3)
mineral
Schist
Crystalline Metamorphic Rock (Schist)
metamorphic
Mottled granite or granitic gneiss pebble
Granite; chiefly quartz, feldspar, and biotite/hornblende
igneous
Rounded greenstone pebble
Likely serpentinite or chlorite-rich metamorphic rock; exact identification requires testing
metamorphic