Garnet (almandine or pyrope variety)
Silicate mineral Group: (Fe, Mg, Mn, Ca)3(Al, Fe, Cr)2(SiO4)3
mineral
Category
Mineral In Metamorphic Rock
Browse mineral in metamorphic rock specimens identified by the Rock Identifier community.
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Mixed Rock Collection (Pebbles and Stones)
Various geological specimens
igneous, sedimentary, and metamorphic
Mica-rich metamorphic rock, likely schist
Muscovite–biotite schist; principally muscovite mica, biotite, quartz, and feldspar
metamorphic
Dark metamorphic rock, possibly schist
Mica schist (probable; commonly quartz + muscovite/biotite, with possible graphite or chlorite)
metamorphic
Mica-rich metamorphic rock, likely schist
Muscovite–biotite schist, possibly with quartz and feldspar
metamorphic
Spessartine Garnet in Quartz/Feldspar Pegmatite
Spessartine (Mn3Al2(SiO4)3) in Quartz (SiO2) and Feldspar
Mineral in Igneous Rock
Mica Schist
Metamorphic Rock (Schistose)
metamorphic
Honey calcite (likely rough cleavage fragment)
Calcite, calcium carbonate (CaCO₃)
mineral
Gneiss
Metamorphic Gneiss
metamorphic
Gneiss
Foliated Metamorphic Rock
metamorphic
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Pyrite
Iron Disulfide (FeS2)
mineral
Dark metamorphic rock, likely biotite schist or gneiss
Quartz–feldspar–biotite metamorphic rock; exact identification requires a fresh surface and testing
metamorphic
Schist
Metamorphic Rock (Schist)
metamorphic
Gneiss
Gneissic Metamorphic Rock
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Educational Geologic Collection
Mixed Mineral and Rock Collection (Various compositions)
mineral
Likely quartz-rich metamorphic rock (quartzite or milky quartz)
Quartzite; predominantly quartz (SiO₂), possibly with feldspar and iron-oxide staining
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Hypersthene
Hypersthene ((Mg,Fe)SiO₃)
Mineral
Gneiss (with Mica and Quartz)
Gneissic Metamorphic Rock
metamorphic
Schist
Schist (metamorphic rock)
metamorphic
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Quartz in Greenstone
Metamorphic rock with quartz vein (SiO2 / mixed silicates)
metamorphic
Gneiss
Metamorphic rock (Gneiss)
metamorphic
Garnet (Almandine/Pyrope series)
Garnet Group - X3Y2(SiO4)3
mineral
Pyrite in Quartz Matrix
Iron Sulfide (FeS2) embedded in Silicon Dioxide (SiO2)
mineral
Quartz-rich metamorphic rock, likely mica schist
Mica schist; chiefly quartz (SiO₂) with biotite/muscovite mica and possible feldspar
metamorphic
Schist
Mica Schist (contains muscovite/biotite and quartz)
metamorphic
Muscovite Mica
Muscovite / KAl2(AlSi3O10)(OH)2
mineral
Gneiss (Banded Gneiss Cobble)
Gneiss
metamorphic
Quartz (Milky/Crystalline)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Likely biotite-bearing metamorphic rock (schist or gneiss)
Mica schist/gneiss; chiefly quartz, feldspar, and biotite mica
metamorphic
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Quartz-rich metamorphic rock, likely quartzite
Quartzite; predominantly crystalline SiO₂, possibly with mica or iron-oxide impurities
metamorphic
Agate (Polished Nodule)
Agate (Silicon Dioxide, SiO2)
mineral
Quartzite
Quartz-rich metamorphic rock; chiefly SiO₂
metamorphic
Slate
Foliated Metamorphic Rock (composed of quartz, illite, chlorite)
metamorphic
Likely schist, possibly serpentinite
Mica schist; potential chlorite–serpentine-rich metamorphic rock
metamorphic
Quartzite with Epidote/Chlorite Inclusion
Metamorphic Quartzite (SiO2 with accessory silicate minerals)
metamorphic
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral