Black Tourmaline
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)
mineral
Category
Mineral And Metamorphic Rock
Browse mineral and metamorphic rock specimens identified by the Rock Identifier community.
Learn about Mineral And Metamorphic Rock in the encyclopedia
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Agate
Agatized Chalcedony (SiO2)
mineral
Rough Sapphire (Corundum)
Corundum (Al2O3)
mineral
Banded Agate
Agate (Cryptocrystalline variety of Quartz, SiO2)
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Granitic Gneiss Pebble
Gneiss (felsic metamorphic rock)
metamorphic
Quartz-rich mineral fragment
Quartz (silicon dioxide, SiO₂), possibly milky quartz
mineral
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Garnet Schist
Almandine Garnet in Mica Schist
metamorphic
Gneiss (Metamorphic Rock Pebble)
Foliated Metamorphic Rock (Quartz-Feldspar Gneiss / Granitic Gneiss)
metamorphic
Granitic Gneiss
Gneiss (quartz-feldspar-mica complex)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (foliated metamorphic rock)
metamorphic
Green Schist (Greenschist)
Greenschist facies metamorphic rock
metamorphic
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Quartz Vein / Milky Quartz
Silicon Dioxide (SiO2)
mineral
Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Banded Metamorphic Rock (likely Quartzite or Serpentinite/Soapstone)
Metamorphic Rock (possibly a banded Quartzite or a foliated Serpentinite/Talc Schist based on appearance, general term for such a rock is 'Banded Metamorphic Rock' or 'Gneiss' if pronounced banding of different minerals)
Metamorphic
Lapis Lazuli
Lapis Lazuli (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
metamorphic
Dark metamorphic rock, likely hornfels or fine-grained basalt
Probable hornfels; commonly quartz–feldspar–mica with variable amphibole/pyroxene
metamorphic
Garnet Schist
Mica Schist with Almandine (Fe3Al2(SiO4)3)
metamorphic
Banded Gneiss with Quartz Vein
Gneiss containing SiO2 (Quartz) intrusion
metamorphic
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Ptygmatic Migmatite
Migmatite (consisting of Neosome and Paleosome fractions)
metamorphic
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Brown Marble
Metamorphic Limestone (CaCO3)
metamorphic
Quartz-rich metamorphic rock, likely quartzite
Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with mica or feldspar
metamorphic
Unakite
Epidotized Granite
metamorphic
Quartzite Pebble (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
metamorphic
Green Aventurine
Quartz with Fuchsite inclusions (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Banded Agate
Agate (Cryptocrystalline Quartz, SiO2)
mineral
Limonite pseudomorph after pyrite
Goethite / Limonite pseudomorph after Pyrite (Fe3+O(OH) replacing FeS2)
mineral
Mica (Biotite or Phlogopite variety)
Phyllosilicate (complex mineral formula involving K, Mg, Fe, Al, Si, and O)
mineral
Gneiss
Gneiss
metamorphic
Folded Schist / Gneiss (Metamorphic Rock)
Regional Metaphoric Folded Outcrop (predominantly Schist/Gneiss)
metamorphic