Blue Kyanite
Kyanite (Al2SiO5)
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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Biotite-bearing granite or granitic gneiss
Quartz–feldspar–mica rock; chiefly quartz (SiO₂), feldspars, and biotite mica
igneous
Mica Schist
Schist (Muscovite/Biotite Schist)
metamorphic
Greenshist / Chlorite Schist
Chlorite schist (contains (Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6)
metamorphic
Rounded gray metamorphic rock, likely quartzite or gneiss
Quartz-rich metamorphic rock; exact identification is uncertain from the photograph
metamorphic
Mica Schist with Quartz
Muscovite/Biotite Schist
metamorphic
Quartz with Mica / Chlorite Inclusion
Silicon Dioxide (SiO2) with Phyllosilicate minerals
metamorphic
Sapphire (Corundum variety)
Sapphire (Al₂O₃)
Mineral
Schist
Mica Schist
metamorphic
Greenschist
Chlorite-actinolite schist
metamorphic
Talc Schist / Soapstone
Talc (Mg3Si4O10(OH)2)
metamorphic
Banded Gneiss
Gneiss (quartz-feldspar-biotite metamorphic rock)
metamorphic
Greenschist (Chlorite Schist)
Greenschist (Metamorphic rock dominated by chlorite, actinolite, and epidote)
metamorphic
Fuchsite
Chromian Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Schist
Mica Schist
metamorphic
Greenschist
Chlorite schist
metamorphic
Quartzite Pebble
Quartzite (SiO2 based)
metamorphic
Biotite (Black Mica)
K(Mg,Fe)3AlSi3O10(OH,F)2
mineral
Schist (Mica Schist)
Mica Schist
metamorphic
Schist
Lepidoblastic Mica Schist
metamorphic
Mica Schist with Pyrite
Muscovite/Biotite Schist with Iron Sulfide (FeS2)
metamorphic
Schist
Mica Schist
metamorphic
Mica Schist
Mica Schist (predominantly Muscovite/Biotite Schist)
metamorphic
Quartz-rich granite or granitic gneiss
Granite; primarily quartz (SiO₂), feldspar, and mica, possibly weakly metamorphosed
igneous
Muscovite Schist with Quartz
Mica Schist (KAl2(AlSi3O10)(OH)2 with SiO2)
metamorphic
Garnet Schist
Garnet-bearing Mica Schist
metamorphic
Mica Schist (with Muscovite)
Muscovite Mica Schist (KAl2(AlSi3O10)(F,OH)2)
metamorphic
Feldspar-rich igneous rock, likely granite or gneiss fragment
Granite-like quartz–feldspar rock; exact identification is uncertain from the blurred image
igneous
Yellow Aventurine
Silicon Dioxide (Quartz with inclusions), SiO2
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Dark gray foliated metamorphic rock, likely slate or phyllite
Slate/phyllite; commonly quartz, muscovite/illite, chlorite, and graphite or carbonaceous matter
metamorphic
Muscovite Schist
Muscovite Schist (KAl2(AlSi3O10)(OH)2 matrix)
metamorphic
Green Schist
Greenschist (Chlorite Schist)
metamorphic
Garnet
Almandine/Pyrope Garnet (X3Y2(SiO4)3)
mineral
Mixed rounded stream pebbles
Most appear to be granitic and mafic igneous rocks, including granite, gneiss, basalt, and possibly quartzite; exact identification is uncertain from the image.
igneous
Muscovite Mica
Muscovite (Potassium Mica) KAl2(AlSi3O10)(OH)2
Mineral
Quartzite Cobble
Quartzite (SiO2 based)
metamorphic
Muscovite Mica
Muscovite (Potassium Aluminum Silicate) - KAl2(AlSi3O10)(F,OH)2
mineral
Calcite-rich limestone
Limestone, primarily calcite (CaCO₃), possibly fossiliferous or dolomitic
sedimentary
Granite / Gneiss (Felsic Metamorphic or Igneous Rock)
Gneiss (or weathered Granite)
metamorphic
Light-colored granite or granitic gneiss
Granite; typically quartz + feldspar + mica (variable composition)
igneous
Banded gneiss pebble
Gneiss, commonly quartz–feldspar–mica gneiss
metamorphic