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

Agate Geode (Silicon Dioxide (SiO2) - Chalcedony variety) — sedimentary

Agate Geode

Silicon Dioxide (SiO2) - Chalcedony variety

Basalt (Porphyritic Basalt) (Extrusive Igneous Rock) — igneous

Basalt (Porphyritic Basalt)

Extrusive Igneous Rock

Serpentine (Antigorite/Lizardite/Chrysotile group, Mg3Si2O5(OH)4) — metamorphic

Serpentine

Antigorite/Lizardite/Chrysotile group, Mg3Si2O5(OH)4

Pink Granite (Phaneritic Felsic Igneous Rock (composed primarily of Quartz and Potassium Feldspar)) — igneous

Pink Granite

Phaneritic Felsic Igneous Rock (composed primarily of Quartz and Potassium Feldspar)

Basalt (Basalt (Mafic Extrusive)) — igneous

Basalt

Basalt (Mafic Extrusive)

Desert Varnish on Sandstone (Ferromanganese coating on Quartz Arenite) — sedimentary

Desert Varnish on Sandstone

Ferromanganese coating on Quartz Arenite

Pumice and Scoria (Vesicular Volcanic Rock (Pumice: Silicic / Scoria: Mafic)) — igneous

Pumice and Scoria

Vesicular Volcanic Rock (Pumice: Silicic / Scoria: Mafic)

Basalt (Basalt (composition predominately Plagioclase feldspar and Pyroxene)) — igneous

Basalt

Basalt (composition predominately Plagioclase feldspar and Pyroxene)

Rounded quartz-rich river pebble (Likely quartz-bearing rock; exact lithology cannot be determined from the photograph) — igneous

Rounded quartz-rich river pebble

Likely quartz-bearing rock; exact lithology cannot be determined from the photograph

Granite (Felsic intrusive igneous rock) — igneous

Granite

Felsic intrusive igneous rock

Granite (Felsic intrusive igneous rock) — igneous

Granite

Felsic intrusive igneous rock

Hag Stone (Adder Stone / Geode-bearing Pebble) (Sedimentary Rock with Cavity (often Quartzite, Limestone, or Sandstone)) — sedimentary

Hag Stone (Adder Stone / Geode-bearing Pebble)

Sedimentary Rock with Cavity (often Quartzite, Limestone, or Sandstone)

Dark basalt cobble (Basalt, a fine-grained mafic volcanic rock) — igneous

Dark basalt cobble

Basalt, a fine-grained mafic volcanic rock

Basalt (Greenstone/Water-worn Pebble) (Basalt (containing Chlorite/Epidote)) — igneous

Basalt (Greenstone/Water-worn Pebble)

Basalt (containing Chlorite/Epidote)

Fossilized Bone (Permineralized Vertebrate Bone) — fossil

Fossilized Bone

Permineralized Vertebrate Bone

Granite (Granite) — Igneous

Granite

Granite

Asphalt aggregate (Human-made bituminous asphalt containing crushed silicate rock aggregate) — sedimentary

Asphalt aggregate

Human-made bituminous asphalt containing crushed silicate rock aggregate

Sandstone Pebble / Quartzite Pebble (SiO2 (Silicon Dioxide enriched sedimentary rock)) — sedimentary

Sandstone Pebble / Quartzite Pebble

SiO2 (Silicon Dioxide enriched sedimentary rock)

Likely weathered granite or granitic pegmatite fragment (Granite; primarily quartz (SiO₂), feldspar, and mica) — igneous

Likely weathered granite or granitic pegmatite fragment

Granite; primarily quartz (SiO₂), feldspar, and mica

Rugose Coral Fossil (Order Rugosa) — fossil

Rugose Coral Fossil

Order Rugosa

Basalt (Mafic extrusive igneous rock) — igneous

Basalt

Mafic extrusive igneous rock

Weathered granite (Granite; quartz–feldspar–mica plutonic rock) — igneous

Weathered granite

Granite; quartz–feldspar–mica plutonic rock

Weathered granite (Granite; interlocking quartz, feldspar, and mica minerals) — igneous

Weathered granite

Granite; interlocking quartz, feldspar, and mica minerals

Sandstone (Arenite) — Sedimentary

Sandstone

Arenite

Painted Sandstone (Sandstone (clastic sedimentary rock) with acrylic/artistic coating) — sedimentary

Painted Sandstone

Sandstone (clastic sedimentary rock) with acrylic/artistic coating

Iron-stained quartz-rich rock (possibly ironstone) (Quartz (SiO₂) with iron-oxide/hydroxide staining, likely limonite/goethite) — mineral

Iron-stained quartz-rich rock (possibly ironstone)

Quartz (SiO₂) with iron-oxide/hydroxide staining, likely limonite/goethite

Plume Agate or Moss Agate (Agate (SiO2)) — mineral

Plume Agate or Moss Agate

Agate (SiO2)

Quartz vein in host rock (Milky quartz (SiO₂) with likely metamorphic country rock, possibly gneiss or schist) — metamorphic

Quartz vein in host rock

Milky quartz (SiO₂) with likely metamorphic country rock, possibly gneiss or schist

Fossil Shell (Invertebrate fossil (Mollusca)) — fossil

Fossil Shell

Invertebrate fossil (Mollusca)

Sandstone (Sandstone (clastic sedimentary rock)) — Rock

Sandstone

Sandstone (clastic sedimentary rock)

Weathered limestone or calcareous sandstone (Calcitic carbonate rock, likely limestone (CaCO₃), possibly slightly dolomitic) — sedimentary

Weathered limestone or calcareous sandstone

Calcitic carbonate rock, likely limestone (CaCO₃), possibly slightly dolomitic

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Quartzite Pebble (Metamorphosed Quartz Sandstone (SiO2)) — metamorphic

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Banded Greywacke (Greywacke (Lithic wacke)) — sedimentary

Banded Greywacke

Greywacke (Lithic wacke)

Granite (Intrusive Igneous Rock) — igneous

Granite

Intrusive Igneous Rock

Granite Cobble (Intrusive Igneous Rock (Felsic to Intermediate)) — igneous

Granite Cobble

Intrusive Igneous Rock (Felsic to Intermediate)

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Dyed Quartzite (Metamorphosed Quartz (SiO2) with synthetic pigment) — metamorphic

Dyed Quartzite

Metamorphosed Quartz (SiO2) with synthetic pigment

Granite (Plutonic felsic rock (Quartz, Feldspar, Mica)) — igneous

Granite

Plutonic felsic rock (Quartz, Feldspar, Mica)

Basalt (Extrusive mafic igneous rock) — igneous

Basalt

Extrusive mafic igneous rock

Slate (Foliated Metamorphic Rock (Mainly composed of Quartz, Illite, Chlorite)) — metamorphic

Slate

Foliated Metamorphic Rock (Mainly composed of Quartz, Illite, Chlorite)