Rock Identifier

Category

Mineral (Tectosilicate)

Browse mineral (tectosilicate) specimens identified by the Rock Identifier community.

Learn about Mineral (Tectosilicate) in the encyclopedia

Glauconite

Hutcheonite

Halite

Sperrylite

Baddeleyite

Anatase

Brookite

Talc

Euxenite

Eltyubyuite

Buergerite

Dolomite

Limonite (Iron Ore) (Limonite (FeO(OH)·nH2O)) — mineral

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Green Apatite on Albite (Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]) — mineral

Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]

Pale green stone, possibly serpentine (Serpentinite (dominantly serpentine-group minerals; visual identification is uncertain)) — metamorphic

Pale green stone, possibly serpentine

Serpentinite (dominantly serpentine-group minerals; visual identification is uncertain)

Quartz-rich pegmatite with black tourmaline (Granitic pegmatite composed chiefly of quartz, with black tourmaline (schorl); possibly feldspar) — igneous

Quartz-rich pegmatite with black tourmaline

Granitic pegmatite composed chiefly of quartz, with black tourmaline (schorl); possibly feldspar

Biotite Schist (Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]) — metamorphic

Biotite Schist

Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]

Rounded granitic pebble (Granite, a quartz–feldspar-rich plutonic rock) — igneous

Rounded granitic pebble

Granite, a quartz–feldspar-rich plutonic rock

Veined Sandstone with Calcite Veins (Sedimentary sandstone with hydrothermal/mineral veins) — sedimentary

Veined Sandstone with Calcite Veins

Sedimentary sandstone with hydrothermal/mineral veins

Limonite with Quartz (Hydrated Iron Oxide Hydroxide with Silicon Dioxide (FeO(OH)·nH2O + SiO2)) — mineral

Limonite with Quartz

Hydrated Iron Oxide Hydroxide with Silicon Dioxide (FeO(OH)·nH2O + SiO2)

Pink granite pebble (Granite, a coarse-grained felsic intrusive igneous rock) — igneous

Pink granite pebble

Granite, a coarse-grained felsic intrusive igneous rock

Shark Tooth Fossil (Vertebrate fossilized tooth) — fossil

Shark Tooth Fossil

Vertebrate fossilized tooth

Small rounded pebble (rock type indeterminate) (Unidentified lithic pebble; specific composition cannot be determined from the image) — sedimentary

Small rounded pebble (rock type indeterminate)

Unidentified lithic pebble; specific composition cannot be determined from the image

Pyrite in Quartz Matrix (Iron Sulfide (FeS2) embedded in Silicon Dioxide (SiO2)) — mineral

Pyrite in Quartz Matrix

Iron Sulfide (FeS2) embedded in Silicon Dioxide (SiO2)

Epidote (Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)) — mineral

Epidote

Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

Limonite (FeO(OH)·nH2O) — mineral

Limonite

FeO(OH)·nH2O

Granite (Phaneritic felsic intrusive igneous rock) — igneous

Granite

Phaneritic felsic intrusive igneous rock

Small gray-green tumbled stone, likely serpentine (Serpentine-group minerals, approximately Mg₃Si₂O₅(OH)₄; identification is uncertain from the image alone) — metamorphic

Small gray-green tumbled stone, likely serpentine

Serpentine-group minerals, approximately Mg₃Si₂O₅(OH)₄; identification is uncertain from the image alone

Likely serpentine (Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; approximate formula Mg₃Si₂O₅(OH)₄) — metamorphic

Likely serpentine

Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; approximate formula Mg₃Si₂O₅(OH)₄

Pyrite or Chalcopyrite specimen (Gold-colored mineral coating) (Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)) — mineral

Pyrite or Chalcopyrite specimen (Gold-colored mineral coating)

Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)

Likely rough garnet crystal (Garnet group, possibly almandine (Fe₃Al₂(SiO₄)₃)) — mineral

Likely rough garnet crystal

Garnet group, possibly almandine (Fe₃Al₂(SiO₄)₃)

Green Fluorite (Calcium Fluoride (CaF2)) — mineral

Green Fluorite

Calcium Fluoride (CaF2)

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Rainbow Fluorite (Fluorite (Calcium Fluoride, CaF2)) — mineral

Rainbow Fluorite

Fluorite (Calcium Fluoride, CaF2)

Serpentinite (Serpentinite, a rock composed mainly of serpentine-group minerals (approximately Mg₃Si₂O₅(OH)₄)) — metamorphic

Serpentinite

Serpentinite, a rock composed mainly of serpentine-group minerals (approximately Mg₃Si₂O₅(OH)₄)

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

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

Orthoclase Feldspar (Granitic) (KAlSi3O8 (Potassium Feldspar)) — igneous

Orthoclase Feldspar (Granitic)

KAlSi3O8 (Potassium Feldspar)

Limonite (FeO(OH)•nH2O) — mineral

Limonite

FeO(OH)•nH2O

Weathered, iron-stained granite (possible granitic gneiss) (Granite, a quartz–feldspar–mica plutonic rock; visual identification is uncertain) — igneous

Weathered, iron-stained granite (possible granitic gneiss)

Granite, a quartz–feldspar–mica plutonic rock; visual identification is uncertain

Pink Granite Gneiss (Gneiss (High-grade metamorphic rock)) — metamorphic

Pink Granite Gneiss

Gneiss (High-grade metamorphic rock)

Polished garnet bead (likely almandine) (Almandine garnet, Fe₃Al₂(SiO₄)₃ (tentative visual identification)) — gemstone

Polished garnet bead (likely almandine)

Almandine garnet, Fe₃Al₂(SiO₄)₃ (tentative visual identification)

Potassium Feldspar (Orthoclase) (Orthoclase (KAlSi3O8)) — mineral

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

Orthoclase Feldspar (Orthoclase (KAlSi3O8)) — mineral

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Possible weathered metallic mineral specimen (Uncertain; possibly native copper-bearing rock or iron sulfide in a gray host matrix) — mineral

Possible weathered metallic mineral specimen

Uncertain; possibly native copper-bearing rock or iron sulfide in a gray host matrix

Granite (Felsic intrusive igneous rock) — igneous

Granite

Felsic intrusive igneous rock

Lepidolite (K(Li,Al)3(Al,Si,4)10(O,F,OH)2) — mineral

Lepidolite

K(Li,Al)3(Al,Si,4)10(O,F,OH)2

Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2) — mineral

Fuchsite

K(Al,Cr)2(AlSi3O10)(OH)2

Quartz with Sericite and Cinnabar (Silicon Dioxide (SiO2) with muscovite/sericite and mercury sulfide (HgS)) — mineral

Quartz with Sericite and Cinnabar

Silicon Dioxide (SiO2) with muscovite/sericite and mercury sulfide (HgS)

Rhodochrosite (Manganese carbonate (MnCO3)) — mineral

Rhodochrosite

Manganese carbonate (MnCO3)

Chrysocolla and Malachite Beads (Hydrated copper silicates (Chrysocolla) and Copper carbonate hydroxide (Malachite)) — mineral

Chrysocolla and Malachite Beads

Hydrated copper silicates (Chrysocolla) and Copper carbonate hydroxide (Malachite)

Limonite (FeO(OH)•nH2O) — mineral

Limonite

FeO(OH)•nH2O

Copper-bearing Quartz Vein in Host Rock (Quartz with Malachite/Chrysocolla staining) — igneous/metamorphic with 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

Lepidolite

K(Li,Al)3(Si,Al)4O10(F,OH)2