Heliodor (Yellow Beryl)
Beryl (Be3Al2Si6O18 with iron impurities)
gemstone
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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Muscovite Mica (with Schist)
Muscovite - KAl2(AlSi3O10)(OH)2
metamorphic
Weathered granite or granitic gneiss
Granite; primarily quartz, feldspar, and mica (possibly metamorphosed to gneiss)
igneous
Greenstone
Metabasalt / Chlorite Schist
metamorphic
Dark granite or granitic gneiss
Granite; quartz + feldspar + biotite/hornblende, possibly weakly gneissic
igneous
Fuchsite
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Schist
Schist
metamorphic
Pink Granite Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss
metamorphic
Biotite Schist
Biotite Schist (Metamorphic Rock featuring K(Mg,Fe)3AlSi3O10(OH)2)
metamorphic
Green Aventurine (or Xiuyan Jade / Serpentine)
Silicon Dioxide (SiO2) with Fuchsite inclusions or Magnesium Silicate
metamorphic
Gneiss
Gneiss
metamorphic
River Cobble (Gneiss/Schist mix)
Foliated Metamorphic Rock (Gneissic/Schistose)
metamorphic
Kyanite
Kyanite (Al2SiO5)
Mineral
Schist (Micaceous Schist)
Mica Schist
metamorphic
Kyanite (Blue and Green varieties)
Kyanite (Al₂SiO₅)
mineral
Likely granite or granitic gneiss
Quartz–feldspar–mica aggregate; possibly foliated granitic gneiss
igneous
Sandstone
Arenite (SiO2 based with mineral cement)
sedimentary
Orange Quartzite (Tumble-polished)
Quartzite (primarily SiO2)
metamorphic
Almandine Garnet (Tumbled)
Fe3Al2(SiO4)3
mineral
Gneiss
Gneiss (foliated metamorphic rock)
metamorphic
Granite Gneiss
Metamorphic Rock (Quartz, Potassium Feldspar, Plagioclase, Biotite/Amphibole)
metamorphic
Banded Gneiss
Gneiss (SiO2 enriched metamorphic rock)
metamorphic
Granite Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Schist (specifically Mica Schist)
Mica Schist (primarily composed of Muscovite KAl2(AlSi3O10)(OH)2 and Biotite)
metamorphic
Coarse-grained granite or granitic gneiss
Granite: quartz + feldspar + mica; possible gneissic equivalent
igneous
Mica Specimen (Schist / Muscovite)
Muscovite / Biotite Mica (KAl2(AlSi3O10)(F,OH)2)
metamorphic
Banded Schist
Mica Schist
metamorphic
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Serpentine Schist with Quartz Vein
Serpentine Schist (a type of Metamorphic rock). The white band is likely Quartz (SiO2).
Metamorphic
Mica Schist
Mica Schist (primarily Muscovite and Biotite KAl2(AlSi3O10)(OH)2)
metamorphic
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(OH)₄(BO₃)₃Si₆O₁₈)
mineral
Granite Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Weathered granite or granitic gneiss fragment
Granite, predominantly quartz, feldspar, and dark mica/amphibole
igneous
Sandstone (with potentially metamorphic or basaltic bands)
Arenite / Lithic Wacke
sedimentary
Mica Schist
Mica Schist (primarily Muscovite or Biotite Schist)
metamorphic
Mica Schist
Mica Schist (Schistose metamorphic rock rich in Muscovite/Biotite)
metamorphic
Banded gneiss (weathered glacial erratic)
Gneiss; typically quartz–feldspar–biotite ± hornblende
metamorphic
Muscovite Schist with Quartz
KAl2(AlSi3O10)(OH)2 in Schistose matrix
metamorphic
Biotite-bearing granite or gneiss
Felsic granitoid; chiefly quartz, feldspar, and biotite mica
igneous
Banded gneiss
Felsic biotite–quartz–feldspar gneiss
metamorphic