Graphite-rich schist (probable graphite flake)
Graphite (C) in graphitic schist; commonly with quartz, mica, and feldspar
metamorphic
Category
Mineral And Metamorphic Rock
Browse mineral and metamorphic rock specimens identified by the Rock Identifier community.
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Quartz-rich metamorphic rock, likely quartzite
Quartzite (predominantly quartz, SiO₂); identification is tentative from the image
metamorphic
Quartz-Veined Gneiss or Metamorphic Rock with Quartz Veins
Quartz-veined metamorphic rock (Silicate mineral assemblage)
metamorphic
Pale greenish quartz-bearing rock, possibly serpentine or altered feldspar
Tentatively serpentinite-related rock (serpentine-group minerals) or altered granitic material; identification is uncertain from the photograph
metamorphic
Quartz geode or quartz-bearing rock
Quartz (SiO₂), likely in a chalcedony- or basalt-hosted cavity
mineral
Tumbled milky quartz
Quartz (SiO₂), microcrystalline or massive variety
mineral
Milky quartz (possibly chalcedony)
Quartz, SiO₂; likely massive or cryptocrystalline quartz
mineral
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Slate
Slate (Metamorphic Rock)
metamorphic
Biotite (Black Mica)
Biotite - K(Mg,Fe)3(AlSi3O10)(F,OH)2
mineral
Gneiss
Metamorphic Gneiss
metamorphic
Gneiss
Gneiss (a metamorphic rock)
Metamorphic
Slate
Slate (Metamorphic rock)
metamorphic
Blue Apatite
Calcium phosphate mineral, Ca5(PO4)3(F,Cl,OH)
mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Small rounded mineral/rock fragment
Indeterminate; possibly quartz-rich stone or feldspar
mineral
Mica Schist
Schist (Mica-rich Metamorphic Rock)
metamorphic
Schist
Schist
metamorphic
Milky quartz
Quartz, silicon dioxide (SiO₂)
mineral
Quartz-rich translucent stone, possibly quartzite or milky quartz
Quartz (SiO₂), potentially quartzite if the specimen is metamorphic
mineral
Spessartine Garnet in Quartz/Feldspar Pegmatite
Spessartine (Mn3Al2(SiO4)3) in Quartz (SiO2) and Feldspar
Mineral in Igneous Rock
Banded gneissic rock
Gneiss, likely quartz–feldspar–biotite gneiss
metamorphic
Clear quartz chips
Quartz (silicon dioxide, SiO₂)
mineral
Gneiss
Gneissic Metamorphic Rock
metamorphic
Quartz-rich rock, possibly milky quartz or quartzite fragment
Quartz (SiO₂), potentially quartzite if metamorphic
mineral
Fuchsite
Chromium-rich Muscovite Mica
mineral
Gneiss with Quartz Vein
Metamorphic Gneiss with Quartz (SiO2) and Feldspar Injection
metamorphic
Milky quartz with iron-oxide staining
Quartz (silicon dioxide, SiO₂)
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4)
metamorphic
Likely polished dark stone or mineral specimen (unidentifiable from image)
Undetermined; possibly dark quartz-rich material, basalt, or obsidian
mineral
White quartz pebble
Quartz (silicon dioxide, SiO₂), likely milky quartz
mineral
Serpentine-rich metamorphic rock
Serpentinite, likely with quartz or calcite veining and minor magnetite
metamorphic
Tumbled purple stone, possibly lepidolite-bearing rock or dyed quartzite
Uncertain from image; possible quartz (SiO₂) with purple mica, or artificially dyed silicate
mineral
Green Gneiss
Metamorphic Gneiss
metamorphic
Likely tumbled quartz or feldspar fragment
Quartz (SiO₂) or feldspar-group silicate
mineral
Milky quartz in weathered host rock
Quartz, silicon dioxide (SiO₂), likely with iron-stained feldspar or altered matrix
mineral
Green Aventurine
Quartz with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
Gneiss (Metamorphic rock)
metamorphic
Milky quartz (likely quartzite or massive quartz)
Quartz, SiO₂
mineral
Schist
Metamorphic Rock (Mica Schist)
metamorphic
Likely blue-gray gneiss
Gneiss, a foliated metamorphic rock; exact mineral composition cannot be confirmed from the image
metamorphic