Greenstone / Greenschist
Greenschist (composed of chlorite, epidote, and actinolite)
metamorphic
Category
Metamorphic Rock (For Nephrite And Some Jadeite); Mineral (For Jadeite)
Browse metamorphic rock (for nephrite and some jadeite); mineral (for jadeite) specimens identified by the Rock Identifier community.
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Unakite
Unakite (Metasomatized Granite)
metamorphic
Banded Gneiss
Gneiss
metamorphic
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Blue Quartz (specifically Dumortierite Quartz)
SiO2 (Silicon Dioxide) with inclusions of AlAl6BSi3O18 (Dumortierite)
mineral
Granite Gneiss
Gneiss (High-grade metamorphic rock formed from granitic precursor)
metamorphic
Bronzite
MgSiO3 (Enstatite with 10-30% FeSiO3 in solid solution)
Mineral
River Cobble (likely Serpentinite or Greenstone)
Serpentinite / Greenschist facies rock
metamorphic
Magnetite or Magnetic Iron Ore
Magnetite (Fe3O4)
mineral
Gneiss
Gneiss
metamorphic
Tumbled greenish serpentine
Serpentinite; chiefly antigorite/lizardite, Mg₃Si₂O₅(OH)₄
metamorphic
Mica Schist
Mica Schist (Intermediate-grade Metamorphic Rock)
metamorphic
Quartzite
Metamorphic Rock (Quartzite)
metamorphic
Greenstone / Serpentinite
Antigorite and Lizardite mixture (Mg3Si2O5(OH)4)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Serpentine
Serpentine Group (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Tumbled pale greenish stone, likely serpentine or altered limestone
Probable serpentine-group rock (antigorite/lizardite), possibly serpentinite; identification is visual only
metamorphic
Schist
N/A (a rock type, not a mineral formula)
metamorphic
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Prehnite
Ca2Al(AlSi3O10)(OH)2
mineral
Garnet
Garnet Group (Silicate Minerals), formula varies e.g., Almandine Fe3Al2(SiO4)3
mineral
Gneiss
Gneiss
metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Feldspar (Orthoclase)
Potassium Feldspar (KAlSi3O8)
mineral
Amazonite
Microcline (KAlSi3O8)
mineral
Magnetite (Octahedral Crystal)
Magnetite (Fe3O4)
mineral
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Quartz on Greenstone
Silicon Dioxide (SiO2) on Altered Igneous Geologic Unit
metamorphic
Pegmatite (Granitic Pegmatite with Quartz and Feldspar)
Intrusive Igneous Rock (Granitic Pegmatite)
igneous
Gneiss (specifically a granitic gneiss cobble)
Gneiss (high-grade regional metamorphic rock)
metamorphic
Quartzite
Quartzite (SiO2 silicon dioxide)
metamorphic
Banded Gneiss (with possible weathered sulfide or iron staining)
Gneiss, potentially with iron oxide/hydroxide staining (e.g., limonite) or weathered sulfides
Metamorphic
Serpentinite
Serpentinite (composed primarily of serpentine group minerals including antigorite, chrysotile, and lizardite)
metamorphic
Charnockite
Orthopyroxene-bearing granite (Charnockite)
metamorphic
Amazonite
Microcline (KAlSi3O8) with trace lead (Pb)
mineral
Unakite
Epidote–pink feldspar–quartz rock
metamorphic
Likely polished garnet
Garnet group; probably almandine, iron-aluminum silicate (Fe₃Al₂Si₃O₁₂)
gemstone
Quartz-rich metamorphic pebble, possibly jade-like greenstone
Likely quartzite or altered basalt/greenstone; visible minerals may include quartz, feldspar, chlorite/epidote, and iron oxides
metamorphic
Granite Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Amazonite
Potassium aluminum silicate (KAlSi3O8)
mineral
Garnet
Garnet Group (formula varies, e.g., Almasndine: Fe3Al2(SiO4)3)
mineral