Banded gneiss
Foliated quartz–feldspar gneiss, likely with mica
metamorphic
Category
Mineral Composite
Browse mineral composite specimens identified by the Rock Identifier community.
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Likely serpentine
Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; approximate formula Mg₃Si₂O₅(OH)₄
metamorphic
Pyrite or Chalcopyrite specimen (Gold-colored mineral coating)
Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)
mineral
Likely rough garnet crystal
Garnet group, possibly almandine (Fe₃Al₂(SiO₄)₃)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Rainbow Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Raw dark metallic mineral specimen, possibly native gold-bearing quartz or sulfide ore
Uncertain from image; possible pyrite/chalcopyrite-bearing quartz or gold-bearing sulfide matrix
mineral
Orthoclase Feldspar (Granitic)
KAlSi3O8 (Potassium Feldspar)
igneous
Limonite
FeO(OH)•nH2O
mineral
Weathered, iron-stained granite (possible granitic gneiss)
Granite, a quartz–feldspar–mica plutonic rock; visual identification is uncertain
igneous
Pink Granite Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Polished garnet bead (likely almandine)
Almandine garnet, Fe₃Al₂(SiO₄)₃ (tentative visual identification)
gemstone
Lapis Lazuli
Lapis Lazuli (Rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)
metamorphic
Possible weathered metallic mineral specimen
Uncertain; possibly native copper-bearing rock or iron sulfide in a gray host matrix
mineral
Granite
Felsic intrusive igneous rock
igneous
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Lepidolite
K(Li,Al)3(Al,Si,4)10(O,F,OH)2
mineral
Granite
Intrusive Igneous Rock
igneous
Lapis Lazuli
Lapis Lazuli (Mineral composition: Lazurite, Calcite, Sodalite, and Pyrite)
metamorphic
Lapis Lazuli
Lapis Lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)
metamorphic
Bauxite
AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)
sedimentary
Fuchsite
K(Al,Cr)2(AlSi3O10)(OH)2
mineral
Quartz with Sericite and Cinnabar
Silicon Dioxide (SiO2) with muscovite/sericite and mercury sulfide (HgS)
mineral
Epidote
Calcium aluminum iron silicate hydroxide, Ca2(Al, Fe)3(SiO4)3(OH)
mineral
Sandstone
Clastic sedimentary rock
sedimentary
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Chrysocolla and Malachite Beads
Hydrated copper silicates (Chrysocolla) and Copper carbonate hydroxide (Malachite)
mineral
Greenstone (likely serpentine-rich rock)
Serpentinite, composed mainly of serpentine-group minerals
metamorphic
Limonite
FeO(OH)•nH2O
mineral
Sandstone
Arenite
sedimentary
Likely milky quartz, possibly quartz-rich vein rock
Quartz (SiO₂); identification from the image is uncertain
mineral
Copper-bearing Quartz Vein in Host Rock
Quartz with Malachite/Chrysocolla staining
igneous/metamorphic with mineral
Lepidolite
K(Li,Al)3(Si,Al)4O10(F,OH)2
mineral
Granite (likely weathered, coarse-grained specimen)
Granite; chiefly quartz, feldspar, and mica
igneous
Serpentine (rough serpentine-rich rock)
Serpentine-group minerals, chiefly antigorite and/or lizardite; composition broadly Mg₃Si₂O₅(OH)₄
metamorphic
Granite
Granite, a felsic intrusive igneous rock composed chiefly of quartz, feldspar, and mica
igneous
Chrysocolla-bearing copper ore (tentative)
Chrysocolla, a hydrated copper silicate; commonly intergrown with quartz and/or other copper minerals
mineral
Granite with Epidote
Granite, containing quartz, feldspar, and epidote
Igneous
Banded Gneiss
Gneiss (Felsic to Mafic Metamorphic Rock)
metamorphic
Likely rough garnet
Garnet group, possibly almandine (Fe₃Al₂(SiO₄)₃); identification is uncertain from the image
mineral