Dark gray crystalline rock, possibly basalt
Basalt (tentative; plagioclase–pyroxene–iron oxide assemblage)
igneous
Category
Mineral In Metamorphic Rock
Browse mineral in metamorphic rock specimens identified by the Rock Identifier community.
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Unidentified gray mineral/rock fragment
Indeterminate from image; possibly quartz-rich material or mica-bearing schist
mineral
Amethyst and Ruby in Zoisite
Silicon Dioxide (SiO2) and Anyolite (Zoisite-Hornblende-Ruby mix)
mineral and metamorphic rock
Raw Emerald in Schist Matrix
Beryl (Be3Al2Si6O18) in Mica Schist
Mineral in Metamorphic Rock
Nephrite Jade
Nephrite
Mineral/Rock
Tanzanite
Zoisite (Ca2Al3(SiO4)(Si2O7)O(OH))
gemstone
Garnet amphibolite / Metamorphic Rock
Garnet Amphibolite (Hornblende - Almandine schist/gneiss)
metamorphic
Rhodonite
Rhodonite (MnSiO3)
mineral
Hornblende-bearing metamorphic rock (likely amphibolite)
Amphibolite, chiefly hornblende amphibole and plagioclase feldspar
metamorphic
Quartzite
Quartzite (SiO2 with minor impurities)
metamorphic
Schist
Mica Schist (Foliated Metamorphic Rock)
metamorphic
Pyrite Schist
Metamorphic rock containing FeS2 (Pyrite) with mica and quartz
metamorphic
Hornblende-bearing metamorphic rock (probable amphibolite)
Amphibolite; chiefly hornblende amphibole and plagioclase feldspar
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Tiger's Eye
Silicon Dioxide with Crocidolite (SiO2)
mineral
Schist
Crystalline Metamorphic Rock (Schist)
metamorphic
Unakite
Epidotized Granite
metamorphic
Quartz vein in metamorphic rock
Crystalline Silicon Dioxide (SiO2) in Host Rock
metamorphic
Biotite-bearing gneiss or schist
Quartz–feldspar–biotite metamorphic rock
metamorphic
Quartz with Mica / Chlorite Inclusion
Silicon Dioxide (SiO2) with Phyllosilicate minerals
metamorphic
Greenschist (or Serpentinite with Manganese Dendrites)
Greenschist facies metamorphic rock
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Schist
Metamorphic Rock (Mica Schist)
metamorphic
Quartz-Veined Slate or Greenstone
Metamorphic rock with quartz vein (SiO2)
metamorphic
Green Aventurine
Quartz with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Quartzite
Metamorphic Rock (Mainly SiO2)
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Garnet Schist
Mica Schist with Almandine (Fe3Al2(SiO4)3)
metamorphic
Gneiss
High-grade regional metamorphic rock (Foliated)
metamorphic
Mica Schist
Schist (Mica-rich Metamorphic Rock)
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Garnet-bearing metamorphic rock
Garnet schist or garnet amphibolite; garnet likely almandine–pyrope solid solution, (Fe,Mg)₃Al₂Si₃O₁₂
metamorphic
Greenstone / Greenschist
Greenschist facies metamorphic rock
metamorphic
Mica Schist with Pyrite
Mica Schist (FeS2 containing)
metamorphic
Greenish metamorphic rock (possibly chlorite schist)
Chlorite-rich schist; exact identification is uncertain from the image
metamorphic
Garnet-bearing metamorphic rock
Likely garnet schist or garnet-bearing mica schist; garnet is commonly almandine, Fe₃Al₂(SiO₄)₃
metamorphic
Small dark mineral or rock fragment
Indeterminate; possibly mica-rich schist, biotite, or a dark sulfide mineral
mineral
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Foliated metamorphic rock, likely biotite gneiss or schist
Biotite-rich gneiss/schist; chiefly quartz, feldspar, and biotite mica
metamorphic
Garnet-bearing metamorphic rock, possibly garnet amphibolite or mica schist
Almandine garnet (Fe₃Al₂Si₃O₁₂) in a mafic, amphibole–feldspar-rich matrix
metamorphic
Likely dark green-gray metamorphic pebble
Indeterminate; possibly chlorite schist, serpentinite, or amphibolite
metamorphic
Granite with Epidote
Granite, containing quartz, feldspar, and epidote
Igneous