Rock Identifier

Category

Rock

Browse rock specimens identified by the Rock Identifier community.

Learn about Rock in the encyclopedia

Rock Gypsum

Coral Rock

Rock Salt

Asphalt Rock

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Cataclasite

Anorthosite

Peridotite

Gondite

Phosphorite

Epidosite

Chert (Jasper/Flint Pebble) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (Jasper/Flint Pebble)

Microcrystalline quartz (SiO2)

Granitic rock, likely weathered granite (Granite; primarily quartz, feldspar, and mica) — igneous

Granitic rock, likely weathered granite

Granite; primarily quartz, feldspar, and mica

Quartzite Pebble with Feldspar Vein (Quartzite (SiO2) with Feldspar (KAlSi3O8)) — metamorphic

Quartzite Pebble with Feldspar Vein

Quartzite (SiO2) with Feldspar (KAlSi3O8)

Schist (likely Mica Schist) (Mica Schist) — metamorphic

Schist (likely Mica Schist)

Mica Schist

Yellow Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Beach Pebble (Basalt/Porphyry) (Weathered Basalt or Porphyry) — igneous

Beach Pebble (Basalt/Porphyry)

Weathered Basalt or Porphyry

Quartz pebble with calcite (Silicon dioxide (SiO2) with Calcium carbonate (CaCO3)) — sedimentary

Quartz pebble with calcite

Silicon dioxide (SiO2) with Calcium carbonate (CaCO3)

Yellow Jasper with Hematite (Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions) — sedimentary

Yellow Jasper with Hematite

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Likely serpentinite (green serpentine rock) (Serpentinite, composed chiefly of serpentine-group minerals (antigorite, lizardite, and/or chrysotile)) — metamorphic

Likely serpentinite (green serpentine rock)

Serpentinite, composed chiefly of serpentine-group minerals (antigorite, lizardite, and/or chrysotile)

Weathered, rounded rock (likely metamorphic or igneous) (Undetermined; possibly a quartz- and feldspar-bearing rock) — metamorphic

Weathered, rounded rock (likely metamorphic or igneous)

Undetermined; possibly a quartz- and feldspar-bearing rock

Granite (Granite, a coarse-grained intrusive felsic igneous rock composed chiefly of quartz, feldspar, and mica) — igneous

Granite

Granite, a coarse-grained intrusive felsic igneous rock composed chiefly of quartz, feldspar, and mica

Porphyritic volcanic rock (likely andesite) (Porphyritic andesite; exact identification requires closer examination) — igneous

Porphyritic volcanic rock (likely andesite)

Porphyritic andesite; exact identification requires closer examination

Gray granite or granitic gneiss fragment (Granite; mainly quartz, feldspar, and mica (exact identification is uncertain from the image)) — igneous

Gray granite or granitic gneiss fragment

Granite; mainly quartz, feldspar, and mica (exact identification is uncertain from the image)

Weathered granite or granitic gneiss (Granite; predominantly quartz, feldspar, and mica (exact identification is uncertain from the image)) — igneous

Weathered granite or granitic gneiss

Granite; predominantly quartz, feldspar, and mica (exact identification is uncertain from the image)

Likely beach-worn pebbles (Lithified rock fragments; exact rock type cannot be determined from the photo) — sedimentary

Likely beach-worn pebbles

Lithified rock fragments; exact rock type cannot be determined from the photo

Ruby in Zoisite (Anyolite (composite of Corundum and Zoisite)) — metamorphic

Ruby in Zoisite

Anyolite (composite of Corundum and Zoisite)

Veined Limestone (Micrite) with Quartz/Calcite Veins (Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions) — sedimentary

Veined Limestone (Micrite) with Quartz/Calcite Veins

Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions

Shale or Slaty Mudstone (Argillaceous sedimentary rock) — sedimentary

Shale or Slaty Mudstone

Argillaceous sedimentary rock

Druzy Quartz on Limestone (Silicon Dioxide (SiO2) on Calcium Carbonate (CaCO3)) — sedimentary

Druzy Quartz on Limestone

Silicon Dioxide (SiO2) on Calcium Carbonate (CaCO3)

Xenolith in Basalt (Mafic Igneous Rock with Felsic Inclusion) — igneous

Xenolith in Basalt

Mafic Igneous Rock with Felsic Inclusion

Serpentine-rich serpentinite (Serpentinite, chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), with possible magnetite, brucite, and carbonate) — metamorphic

Serpentine-rich serpentinite

Serpentinite, chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), with possible magnetite, brucite, and carbonate

Sandstone with Lichen and Iron Oxide Staining (Quartz Arenite / Sandstone) — sedimentary

Sandstone with Lichen and Iron Oxide Staining

Quartz Arenite / Sandstone

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Unknown Rock Fragment (Unknown) — unknown

Unknown Rock Fragment

Unknown

Shale (Shale (Lutite)) — sedimentary

Shale

Shale (Lutite)

Vesicular Basalt (Pumice-like) (Vesicular Basalt) — igneous

Vesicular Basalt (Pumice-like)

Vesicular Basalt

Granodiorite (Granodiorite (containing Plagioclase, Quartz, and Biotite)) — igneous

Granodiorite

Granodiorite (containing Plagioclase, Quartz, and Biotite)

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

Serpentine

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Pink Granite (Phaneritic Felsic Intrusive Igneous Rock) — igneous

Pink Granite

Phaneritic Felsic Intrusive Igneous Rock

Mixed Rock Collection (Pebbles and Stones) (Various geological specimens) — igneous, sedimentary, and metamorphic

Mixed Rock Collection (Pebbles and Stones)

Various geological specimens

igneous, sedimentary, and metamorphic

Granite (Phaneritic plutonic rock (primarily Quartz, Feldspar, and Mica)) — igneous

Granite

Phaneritic plutonic rock (primarily Quartz, Feldspar, and Mica)

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Granite (Plutonic Igneous Rock) — igneous

Granite

Plutonic Igneous Rock

Granite (Intrusive Igneous Rock) — igneous

Granite

Intrusive Igneous Rock

Granite (Intrusive Igneous Rock) — igneous

Granite

Intrusive Igneous Rock

Greenstone, likely altered basalt (Metabasalt (chlorite–actinolite–epidote assemblage), likely greenschist-facies greenstone) — metamorphic

Greenstone, likely altered basalt

Metabasalt (chlorite–actinolite–epidote assemblage), likely greenschist-facies greenstone

Basalt Pebble / River Stone (Basalt (Mafic Extrusive Igneous Rock)) — igneous

Basalt Pebble / River Stone

Basalt (Mafic Extrusive Igneous Rock)

Fossil-bearing limestone with a likely fossil shell (Bioclastic limestone, chiefly calcite (CaCO₃); fossil identity uncertain from the photo) — fossil

Fossil-bearing limestone with a likely fossil shell

Bioclastic limestone, chiefly calcite (CaCO₃); fossil identity uncertain from the photo

Granite boulder (Granite, chiefly quartz–feldspar–mica plutonic rock) — igneous

Granite boulder

Granite, chiefly quartz–feldspar–mica plutonic rock

Granite pebble (Granite, typically quartz–feldspar–mica aggregate) — igneous

Granite pebble

Granite, typically quartz–feldspar–mica aggregate

Shale (or Mudstone) (Laminose Mudrock (composition: clay minerals, quartz, and mica flakes)) — sedimentary

Shale (or Mudstone)

Laminose Mudrock (composition: clay minerals, quartz, and mica flakes)

Fossil Snail (Gastropoda fossil) — fossil

Fossil Snail

Gastropoda fossil