Beryl (likely Aquamarine)
Beryllium aluminum silicate (Be3Al2Si6O18)
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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Mica Schist
Schist (muscovite/biotite rich)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Amphibolite
Amphibolite
metamorphic
Sandstone (Weathered)
Arenite (primarily SiO2)
sedimentary
Muscovite Mica Schist
Metamorphic Rock (Muscovite-Biotite Schist)
metamorphic
Sandstone
Arenite (SiO2 based with quartz grains)
sedimentary
Quartz-rich metamorphic rock, likely quartzite
Quartzite; predominantly quartz (SiO₂), with minor feldspar, mica, and iron-oxide staining
metamorphic
Gneiss (Granitic Gneiss)
Gneiss (composed primarily of Quartz, Feldspar, and Mica)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Muscovite on Quartz (Mica host rock)
KAl2(AlSi3O10)(OH)2 (Muscovite) in SiO2 (Quartz)
igneous/metamorphic
Biotite Schist
Biotite-rich Schist
metamorphic
Quartzite
Quartzite (SiO2 silicon dioxide)
metamorphic
Weathered mica-rich metamorphic rock
Probable biotite schist or mica schist
metamorphic
Greenschist / Basalt Beach Pebble
Metabasalt / Chlorite Schist
metamorphic
Black Tourmaline (Schorl)
NaFe3Al6(BO3)3Si6O18(OH)4
Mineral
Granite Gneiss
Gneiss (derived from granitic protolith)
metamorphic
Slate
Phyllo-silicate based metamorphic rock
metamorphic
Muscovite Mica (in Quartz matrix)
Potassium aluminum silicate hydroxide fluoride (KAl2(AlSi3O10)(F,OH)2)
mineral
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Mica Schist
Mica Schist (primarily Muscovite and Biotite KAl2(AlSi3O10)(OH)2)
metamorphic
Mica Schist
Foliated Metamorphic Rock (Schist)
metamorphic
Banded Gneiss with Quartz Vein
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Schist
Metamorphic Schist
metamorphic
Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
mineral
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Garnet Schist
Almandine Garnet in Mica Schist
metamorphic
Quartz with Muscovite Mica
SiO2 with KAl2(AlSi3O10)(OH)2
mineral group
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Red Quartzite
Quartzite (primarily SiO2 with hematite impurities)
metamorphic
Greenstone or Chlorite Schist
Greenschist / Chlorite schist
metamorphic
Phyllite (possibly low-grade greenish slate)
Foliated metamorphic rock composed mainly of very fine-grained quartz, mica, and chlorite; approximate composition varies and has no single fixed chemical formula
metamorphic
Mica (Muscovite) in Granite
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Quartz-rich feldspathic pebble, possibly granite or granitic gneiss
Quartz–feldspar aggregate, likely granite; dark inclusion may be biotite, hornblende, or iron-oxide staining
igneous
Sandstone (Pebble)
Arenite
sedimentary
Biotite on Quartz Matrix
Biotite - K(Mg,Fe)3(AlSi3O10)(OH,F)2 with Quartz (SiO2)
mineral
Greenstone / altered mafic rock
Likely chlorite–actinolite metabasalt (greenschist); exact identification requires testing
metamorphic
Mica Schist
Mica Schist (predominantly Muscovite/Biotite)
metamorphic
Amazonite
Microcline (KAlSi3O8)
mineral