Rock Identifier

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

Rock Salt

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Eulysite

Hornfels

Metabasalt

Halite

Metagabbro

Metarhyolite

Cordierite Hornfels

Cordierite Hornfels

Dolomite

Gypsum

Serpentinite (Serpentine rock (Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4) — metamorphic

Serpentinite

Serpentine rock (Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4

Quartz (Silicon Dioxide (SiO2)) — Mineral

Quartz

Silicon Dioxide (SiO2)

Rhodonite (Rhodonite, manganese inosilicate — MnSiO₃; the specimen may include quartz, feldspar, and black manganese-oxide minerals in the matrix) — mineral

Rhodonite

Rhodonite, manganese inosilicate — MnSiO₃; the specimen may include quartz, feldspar, and black manganese-oxide minerals in the matrix

Almandine Garnet in Schist Matrix (Almandine - Fe3Al2(SiO4)3) — metamorphic

Almandine Garnet in Schist Matrix

Almandine - Fe3Al2(SiO4)3

Quartzite with Epidote (Meta-quartzite containing Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))) — metamorphic

Quartzite with Epidote

Meta-quartzite containing Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Likely weathered quartz-bearing rock (uncertain identification) (Possibly quartz-rich granite or granitic aplite; exact identification requires a clearer, larger image and tests) — igneous

Likely weathered quartz-bearing rock (uncertain identification)

Possibly quartz-rich granite or granitic aplite; exact identification requires a clearer, larger image and tests

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Diamond Drill Core (Greenschist and Quartzite) (Chlorite Schist / Meta-quartzite (Metamorphic Rock Core Sample)) — metamorphic

Diamond Drill Core (Greenschist and Quartzite)

Chlorite Schist / Meta-quartzite (Metamorphic Rock Core Sample)

Tiger's Eye (Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)) — metamorphic

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)

Tumbled or naturally etched mica-rich mineral specimen, likely muscovite (Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂; possibly phlogopite mica) — mineral

Tumbled or naturally etched mica-rich mineral specimen, likely muscovite

Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂; possibly phlogopite mica

Quartz Pebble (Citrine-colored or Stained Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble (Citrine-colored or Stained Quartz)

Silicon Dioxide (SiO2)

Amethyst (Amethyst (Silicon Dioxide, SiO2)) — mineral

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Unakite (Altered Granite (Epidotized Granite)) — metamorphic

Unakite

Altered Granite (Epidotized Granite)

Gneiss (Granitic Gneiss) (Gneiss (from German Gneis, related to 'spark')) — metamorphic

Gneiss (Granitic Gneiss)

Gneiss (from German Gneis, related to 'spark')

Biotite Schist (Biotite Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)) — metamorphic

Biotite Schist

Biotite Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)

Weathered quartz-rich rock, likely quartzite or quartz vein (Quartzite; predominantly quartz (SiO₂), possibly iron-oxide stained) — metamorphic

Weathered quartz-rich rock, likely quartzite or quartz vein

Quartzite; predominantly quartz (SiO₂), possibly iron-oxide stained

Blue Quartzite (Quartzite (primarily SiO2) with inclusions like Dumortierite or Magnesio-riebeckite) — metamorphic

Blue Quartzite

Quartzite (primarily SiO2) with inclusions like Dumortierite or Magnesio-riebeckite

Schist (Garnet-Mica Schist) (Garnet-Mica Schist) — metamorphic

Schist (Garnet-Mica Schist)

Garnet-Mica Schist

Mica Schist (Mica Schist (primarily Muscovite and Quartz)) — metamorphic

Mica Schist

Mica Schist (primarily Muscovite and Quartz)

Mica Schist with Pyrite (Muscovite/Biotite Schist with Iron Sulfide (FeS2)) — metamorphic

Mica Schist with Pyrite

Muscovite/Biotite Schist with Iron Sulfide (FeS2)

Tiger's Eye (Unpolished) (Pseudomorph of Quartz after Crocidolite (SiO2)) — metamorphic

Tiger's Eye (Unpolished)

Pseudomorph of Quartz after Crocidolite (SiO2)

Weathered quartz-rich rock, likely quartzite or altered sandstone (Quartzite (mostly microcrystalline quartz, SiO₂); exact identification is uncertain from the photograph) — metamorphic

Weathered quartz-rich rock, likely quartzite or altered sandstone

Quartzite (mostly microcrystalline quartz, SiO₂); exact identification is uncertain from the photograph

Pink-and-green quartz-rich rock, likely rose quartz with epidote/serpentine (Quartz (SiO₂), variably colored by iron, with possible epidote, chlorite, or serpentine inclusions) — mineral

Pink-and-green quartz-rich rock, likely rose quartz with epidote/serpentine

Quartz (SiO₂), variably colored by iron, with possible epidote, chlorite, or serpentine inclusions

Banded Gneiss (Gneiss (High-grade Regional Metamorphic Rock)) — metamorphic

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Banded Gneiss (Gneiss (High-grade Regional Metamorphic Rock)) — metamorphic

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Granite Gneiss (Gneiss (High-grade metamorphic rock formed from granitic precursor)) — metamorphic

Granite Gneiss

Gneiss (High-grade metamorphic rock formed from granitic precursor)

Mica Schist (Metamorphic Rock (rich in Muscovite or Biotite mica)) — metamorphic

Mica Schist

Metamorphic Rock (rich in Muscovite or Biotite mica)

Greenstone with Quartz Veining (Metamorphosed Mafic Igneous Rock) — metamorphic

Greenstone with Quartz Veining

Metamorphosed Mafic Igneous Rock

Serpentinite (Serpentinite (Mg3Si2O5(OH)4)) — metamorphic

Serpentinite

Serpentinite (Mg3Si2O5(OH)4)

Likely quartz crystal fragment (Quartz (SiO₂), possibly a small tumbled or cleaved fragment) — mineral

Likely quartz crystal fragment

Quartz (SiO₂), possibly a small tumbled or cleaved fragment

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Likely weathered quartz or quartz-rich pebble (Quartz, silicon dioxide (SiO₂)) — mineral

Likely weathered quartz or quartz-rich pebble

Quartz, silicon dioxide (SiO₂)

Agate (SiO2 (Silicon dioxide, chalcedony variety)) — Mineral

Agate

SiO2 (Silicon dioxide, chalcedony variety)

Quartz / Calcite Vein Rock (Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)) — mineral

Quartz / Calcite Vein Rock

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)

Clear Quartz (Rock Crystal) (Silicon Dioxide (SiO2)) — Mineral

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Agate (SiO2 (Chalcedony/Quartz)) — sedimentary

Agate

SiO2 (Chalcedony/Quartz)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Unakite (Epidotized Granite) (Epidote-Feldspar-Quartz Rock) — metamorphic

Unakite (Epidotized Granite)

Epidote-Feldspar-Quartz Rock

Banded Gneiss (Gneiss (High-grade Regional Metamorphic Rock)) — metamorphic

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Pyrite (Fool's Gold) (Iron Pyrite (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Pyrite (FeS2)

Greenstone (Metabasalt (Greenstone Facies)) — metamorphic

Greenstone

Metabasalt (Greenstone Facies)

Orthoclase Feldspar (Salmon variety) (Orthoclase, KAlSi3O8) — mineral

Orthoclase Feldspar (Salmon variety)

Orthoclase, KAlSi3O8