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
Epidote
Calcium aluminum iron silicate hydroxide, Ca2(Al, Fe)3(SiO4)3(OH)
mineral
Mica-rich metamorphic rock (likely schist)
Mica schist, likely muscovite- or biotite-bearing; exact identification is uncertain from the photograph
metamorphic
Tanzanite
Zoisite (Ca2Al3(SiO4)(Si2O7)O(OH))
gemstone
Garnet amphibolite / Metamorphic Rock
Garnet Amphibolite (Hornblende - Almandine schist/gneiss)
metamorphic
Amphibolite
Amphibolite, composed chiefly of hornblende-group amphibole and plagioclase feldspar
metamorphic
Amphibolite
Amphibolite, typically composed mainly of hornblende and plagioclase feldspar
metamorphic
Pink Sapphire
Corundum (Al2O3)
gemstone
Hornblende-bearing metamorphic rock (likely amphibolite)
Amphibolite, chiefly hornblende amphibole and plagioclase feldspar
metamorphic
Schist
Mica Schist (Foliated Metamorphic Rock)
metamorphic
Pyrite-bearing Schist
Metamorphic rock with FeS2
metamorphic
Quartzite
Quartzite (SiO2 with minor impurities)
metamorphic
Hornblende-bearing metamorphic rock (probable amphibolite)
Amphibolite; chiefly hornblende amphibole and plagioclase feldspar
metamorphic
Rhodonite
Rhodonite (MnSiO3)
mineral
Pyrite Schist
Metamorphic rock containing FeS2 (Pyrite) with mica and quartz
metamorphic
Garnet
Silicate mineral group (e.g., Almandine, Fe3Al2(SiO4)3)
mineral
Schist
Crystalline Metamorphic Rock (Schist)
metamorphic
Tiger's Eye
Silicon Dioxide with Crocidolite (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
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
Greenschist (or Serpentinite with Manganese Dendrites)
Greenschist facies metamorphic rock
metamorphic
Quartz with Mica / Chlorite Inclusion
Silicon Dioxide (SiO2) with Phyllosilicate minerals
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
Quartzite
Metamorphic Rock (Mainly SiO2)
metamorphic
Gneiss
High-grade regional metamorphic rock (Foliated)
metamorphic
Mica Schist
Schist (Mica-rich Metamorphic Rock)
metamorphic
Likely foliated metamorphic rock
Uncertain from the image; possibly mica schist or gneiss
metamorphic
Weathered mica-rich rock fragment
Likely mica schist or phyllite; identification is uncertain from the image alone
metamorphic
Green Aventurine
Quartz with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Weathered quartz-bearing rock
Likely quartz-veined schist or gneiss; exact identification is uncertain from the image
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
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
Greenstone (likely chlorite-rich greenschist)
Greenschist facies metamorphic rock, typically composed of chlorite, actinolite, and albite; exact identification requires testing
metamorphic