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

Desert Rose (Baryte or Selenite variant) (Barium Sulfate (BaSO4) or Gypsum (CaSO4·2H2O) with Sand inclusions) — mineral

Desert Rose (Baryte or Selenite variant)

Barium Sulfate (BaSO4) or Gypsum (CaSO4·2H2O) with Sand inclusions

Likely tumbled greenstone (identity uncertain) (Greenstone: metamorphosed mafic volcanic rock, commonly composed of chlorite, actinolite, and epidote) — metamorphic

Likely tumbled greenstone (identity uncertain)

Greenstone: metamorphosed mafic volcanic rock, commonly composed of chlorite, actinolite, and epidote

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Basalt (Mafic extrusive igneous rock) — igneous

Basalt

Mafic extrusive igneous rock

Basalt (Extrusive igneous rock) — igneous

Basalt

Extrusive igneous rock

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Basalt Cobble (Vesicular Basalt (Mafic Extrusive)) — igneous

Basalt Cobble

Vesicular Basalt (Mafic Extrusive)

Granodiorite (Granodiorite) — igneous

Granodiorite

Granodiorite

Metaconglomerate (Metaconglomerate (Quartzite conglomerate)) — metamorphic

Metaconglomerate

Metaconglomerate (Quartzite conglomerate)

Dalmatian Jasper (Peralkaline Quartz-Feldspar Rock with Arfvedsonite) — igneous

Dalmatian Jasper

Peralkaline Quartz-Feldspar Rock with Arfvedsonite

Vesicular Basalt (Lava Rock) (Basalt) — igneous

Vesicular Basalt (Lava Rock)

Basalt

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Granite (Intrusive Igneous Rock (composed primarily of quartz, alkali feldspar, and plagioclase)) — igneous

Granite

Intrusive Igneous Rock (composed primarily of quartz, alkali feldspar, and plagioclase)

Granite (Intrusive Igneous Rock (composed mainly of quartz, alkali feldspar, and plagioclase)) — igneous

Granite

Intrusive Igneous Rock (composed mainly of quartz, alkali feldspar, and plagioclase)

Granite (Felsic intrusive igneous rock) — igneous

Granite

Felsic intrusive igneous rock

Quartz (Clear/Smoky Geode fragment) (Silicon Dioxide (SiO2)) — mineral

Quartz (Clear/Smoky Geode fragment)

Silicon Dioxide (SiO2)

Vesicular Basalt (or Scoria) (Extrusive Igneous Rock (Mafic)) — igneous

Vesicular Basalt (or Scoria)

Extrusive Igneous Rock (Mafic)

Granite (small weathered fragment) (Granite, composed chiefly of quartz, feldspar, and mica) — igneous

Granite (small weathered fragment)

Granite, composed chiefly of quartz, feldspar, and mica

Weathered granite pebble (Granite, a quartz–feldspar–mica intrusive rock) — igneous

Weathered granite pebble

Granite, a quartz–feldspar–mica intrusive rock

Conglomerate (Clastic conglomerate (rounded pebble- to cobble-sized clasts in a finer matrix)) — sedimentary

Conglomerate

Clastic conglomerate (rounded pebble- to cobble-sized clasts in a finer matrix)

Weathered granite or granitic gneiss (Granite; primarily quartz, feldspar, and mica) — igneous

Weathered granite or granitic gneiss

Granite; primarily quartz, feldspar, and mica

Rounded granite or granitic gneiss pebble (Granite, chiefly quartz, feldspar, and mica; exact identification requires testing) — igneous

Rounded granite or granitic gneiss pebble

Granite, chiefly quartz, feldspar, and mica; exact identification requires testing

Basalt (Extrusive igneous rock) — igneous

Basalt

Extrusive igneous rock

Granite (Intrusive Igneous Rock) — igneous

Granite

Intrusive Igneous Rock

Granite (Intrusive Igneous Rock) — igneous

Granite

Intrusive Igneous Rock

Fossil Coral (Rugose Coral or Tabulate Coral (Phylum Cnidaria)) — fossil

Fossil Coral

Rugose Coral or Tabulate Coral (Phylum Cnidaria)

Quartz-rich rock, possibly vein quartz in host rock (Quartz (SiO₂), with unidentified host-rock minerals) — metamorphic

Quartz-rich rock, possibly vein quartz in host rock

Quartz (SiO₂), with unidentified host-rock minerals

Weathered granite or granitic gneiss (Granite; primarily quartz, feldspar, and mica) — igneous

Weathered granite or granitic gneiss

Granite; primarily quartz, feldspar, and mica

Quartz-rich rock, possibly milky quartz (Quartz (SiO₂), likely a massive quartz specimen; exact identification is uncertain from the image) — mineral

Quartz-rich rock, possibly milky quartz

Quartz (SiO₂), likely a massive quartz specimen; exact identification is uncertain from the image

Milky quartz in a light-colored host rock (Quartz (SiO₂), likely with feldspar-rich matrix; exact host rock is unclear from the photo) — mineral

Milky quartz in a light-colored host rock

Quartz (SiO₂), likely with feldspar-rich matrix; exact host rock is unclear from the photo

Fossilized Shell Impression / Siltstone Fossil (Bivalvia / Brachiopoda mold in Siltstone) — fossil

Fossilized Shell Impression / Siltstone Fossil

Bivalvia / Brachiopoda mold in Siltstone

Basalt Pebble (Vesicular / Beach Cobble) (Basalt (mafic extrusive igneous rock)) — igneous

Basalt Pebble (Vesicular / Beach Cobble)

Basalt (mafic extrusive igneous rock)

Jasper (Silicon dioxide (SiO2)) — mineral

Jasper

Silicon dioxide (SiO2)

Granite / Quartzite Specimen (Granite / Quartz (SiO2 with Feldspar and Mica)) — igneous

Granite / Quartzite Specimen

Granite / Quartz (SiO2 with Feldspar and Mica)

Chert Pebble (Chert (Microcrystalline Quartz, SiO2)) — sedimentary

Chert Pebble

Chert (Microcrystalline Quartz, SiO2)

Yellow Quartzite (River Pebble) (Quartzite (SiO2)) — metamorphic

Yellow Quartzite (River Pebble)

Quartzite (SiO2)

Rounded river pebble, likely quartz-rich stone (Unidentified lithic clast; exact mineralogy cannot be determined from the image) — sedimentary

Rounded river pebble, likely quartz-rich stone

Unidentified lithic clast; exact mineralogy cannot be determined from the image

Sandstone (Clastic Sedimentary Rock) — sedimentary

Sandstone

Clastic Sedimentary Rock

Unidentified Rock Fragment (Unknown) — Rock

Unidentified Rock Fragment

Unknown

Quartz geode fragment (Quartz (SiO₂), lining a cavity in a silica-rich rock) — mineral

Quartz geode fragment

Quartz (SiO₂), lining a cavity in a silica-rich rock

Chert with Quartz Veining (Microcrystalline Silica (SiO2)) — sedimentary

Chert with Quartz Veining

Microcrystalline Silica (SiO2)