Muscovite mica
Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂
mineral
Category
Metamorphic Mineral
Browse metamorphic mineral specimens identified by the Rock Identifier community.
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Greenschist
Greenschist facies metamorphic rock
metamorphic
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Rhodonite
(Mn,Fe,Mg,Ca)SiO3
mineral
Blue Apatite
Fluorapatite / Apatite (Ca5(PO4)3(F,Cl,OH))
mineral
Pyrite in Matrix
Iron Sulfide (FeS2) embedded in host rock
mineral
Weathered greenstone (probable)
Chlorite–actinolite–epidote-rich metamorphosed mafic rock; exact identification requires testing
metamorphic
Banded gneiss pebble
Gneiss, commonly quartz–feldspar–mica gneiss
metamorphic
Likely polished slate
Slate, a fine-grained metamorphic rock composed mainly of quartz, mica, and chlorite
metamorphic
Likely banded gneiss
Quartz–feldspar–mica gneiss (tentative visual identification)
metamorphic
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
Foliated Metamorphic Gneiss
metamorphic
Gneiss
Foliated Metamorphic Rock
metamorphic
Feldspar
KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8 (Feldspar group)
mineral
Quartz Heart or Arrowhead Shape
Silicon Dioxide (SiO2)
mineral
Natural Gemstone Cabochons (Ruby, Moonstone, Emerald, Citrine)
Ruby (Al2O3:Cr), Moonstone (KAlSi3O8), Emerald (Be3Al2(SiO3)6:Cr), Citrine (SiO2)
mineral
Quartz pebble with iron staining
Silicon dioxide (SiO2) with iron oxide inclusions
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Pink Quartz
Silicon Dioxide (SiO2)
mineral
Green Aventurine
SiO2
mineral
Banded gneiss pebble
Feldspar–quartz gneiss; exact mineral composition cannot be confirmed from the image
metamorphic
Quartzite River Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Quartz Crystal in Matrix
Silicon Dioxide (SiO2)
mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Greenstone pebble
Greenstone (metamorphosed mafic rock, commonly altered basalt); exact identification requires testing
metamorphic
Weathered foliated metamorphic rock, likely mica schist
Mica schist (likely quartz–muscovite/biotite schist; exact identification requires closer inspection)
metamorphic
Clear Quartz
Silicon dioxide (SiO2)
mineral
Banded gneiss pebble
Gneiss, a foliated metamorphic rock composed mainly of quartz, feldspar, and mica or amphibole
metamorphic
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Green serpentine (likely serpentinite)
Serpentine-group minerals, commonly antigorite, lizardite, and/or chrysotile; rock name: serpentinite
metamorphic
Shale or Slate
Shale (Sedimentary) or Slate (Metamorphic)
sedimentary or metamorphic
Weathered garnet-bearing rock (possibly garnet schist)
Garnet-bearing mica schist; likely almandine garnet (Fe₃Al₂(SiO₄)₃) with mica and quartz
metamorphic
Quartz
Silicon dioxide (SiO2)
mineral
Ruby in Kyanite
Corundum in Disthene (Al2SiO5 + Al2O3)
metamorphic
Staurolite (Fairy Cross)
Staurolite (Fe2+2Al9Si4O23(OH))
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Small rough mineral/rock fragment
Indeterminate; possibly quartz-bearing rock or weathered feldspar
mineral
Blue Zircon
Zircon (Zirconium Silicate), ZrSiO4
gemstone
Greenstone (likely altered basalt)
Metamorphosed mafic volcanic rock, commonly chlorite- and actinolite-rich; exact identification requires testing
igneous
Granite
Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica
igneous
Green Tourmaline (Verdelite)
Elbaite (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4)
gemstone