Rock Identifier

Category

Rock

Browse rock specimens identified by the Rock Identifier community.

Learn about Rock in the encyclopedia

Rock Gypsum

Coral Rock

Asphalt Rock

Rock Salt

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Anorthosite

Cataclasite

Peridotite

Phosphorite

Gondite

Dunite

Quartz (River Siltstone Quartzite Pebble) (Silicon Dioxide (SiO2)) — metamorphic

Quartz (River Siltstone Quartzite Pebble)

Silicon Dioxide (SiO2)

Basalt Cobble (Basalt) — igneous

Basalt Cobble

Basalt

Schist (Mica Schist (primarily consisting of muscovite KAl2(AlSi3O10)(OH)2 or biotite K(Mg,Fe)3(AlSi3O10)(OH)2)) — metamorphic

Schist

Mica Schist (primarily consisting of muscovite KAl2(AlSi3O10)(OH)2 or biotite K(Mg,Fe)3(AlSi3O10)(OH)2)

Quartz Geode (Druzy Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz Geode (Druzy Quartz)

Silicon Dioxide (SiO2)

Scoria (Lava Rock) (Scoria) — igneous

Scoria (Lava Rock)

Scoria

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Conglomerate (Pebble Conglomerate) (Conglomerate) — sedimentary

Conglomerate (Pebble Conglomerate)

Conglomerate

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Sandstone (Calcareous or Quartz-rich) (Arenite) — sedimentary

Sandstone (Calcareous or Quartz-rich)

Arenite

Quartzite (Metamorphosed Quartz Sandstone (SiO2)) — metamorphic

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Eclogite (retrograded) (Eclogite (Omphacite-Garnet rock)) — metamorphic

Eclogite (retrograded)

Eclogite (Omphacite-Garnet rock)

Chondrite Meteorite (Ordinary Chondrite (L or H Group)) — igneous

Chondrite Meteorite

Ordinary Chondrite (L or H Group)

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

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Granite Cobble (Granite (Felsic intrusive igneous rock)) — igneous

Granite Cobble

Granite (Felsic intrusive igneous rock)

Limestone (Limestone (Calcium Carbonate: CaCO3)) — sedimentary

Limestone

Limestone (Calcium Carbonate: CaCO3)

Olivine Peridotite (Peridotite (comprising Olivine (Mg,Fe)2SiO4 and Pyroxene)) — igneous

Olivine Peridotite

Peridotite (comprising Olivine (Mg,Fe)2SiO4 and Pyroxene)

Sandstone (likely Arkosic) (Arenite (SiO2 with KAlSi3O8)) — sedimentary

Sandstone (likely Arkosic)

Arenite (SiO2 with KAlSi3O8)

Granite (Intrusive igneous felsic rock) — igneous

Granite

Intrusive igneous felsic rock

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Quartzite (Quartzite (composed primarily of SiO2)) — metamorphic

Quartzite

Quartzite (composed primarily of SiO2)

Limestone (Weathered) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (Weathered)

Calcium Carbonate (CaCO3)

Quartzite River Rock (Quartzite (primarily SiO2)) — metamorphic

Quartzite River Rock

Quartzite (primarily SiO2)

Feldspar-Quartz Rock (likely Pegmatite or Granite) (Feldspar-Quartz composite rock (KAlSi3O8 - SiO2)) — igneous

Feldspar-Quartz Rock (likely Pegmatite or Granite)

Feldspar-Quartz composite rock (KAlSi3O8 - SiO2)

Faceted Clear Quartz (Rock Crystal) (Silicon Dioxide (SiO2)) — gemstone

Faceted Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Chert Breccia (Brecciated Chert (Sedimentary Rock)) — sedimentary

Chert Breccia

Brecciated Chert (Sedimentary Rock)

Sandstone (Lithic Sandstone / Greywacke) (Sandstone (SiO2 rich clastic sedimentary rock)) — sedimentary

Sandstone (Lithic Sandstone / Greywacke)

Sandstone (SiO2 rich clastic sedimentary rock)

Ammonite Fossil in Limestone Matrix (Ammonoidea (subclass) in Calcium Carbonate (CaCO3)) — sedimentary

Ammonite Fossil in Limestone Matrix

Ammonoidea (subclass) in Calcium Carbonate (CaCO3)

Basalt Pebble (Basalt (Mafic Extrusive Igneous Rock)) — igneous

Basalt Pebble

Basalt (Mafic Extrusive Igneous Rock)

Sandstone (Sandstone (clastic sedimentary rock)) — sedimentary

Sandstone

Sandstone (clastic sedimentary rock)

Basalt (Basalt (Mafic igneous rock)) — igneous

Basalt

Basalt (Mafic igneous rock)

Granite (Pebble) (Granite (composed of Quartz, Feldspar, and Mica/Amphibole)) — igneous

Granite (Pebble)

Granite (composed of Quartz, Feldspar, and Mica/Amphibole)

Pink Granite / Potassium Feldspar with Quartz (Granite (composed mainly of Orthoclase KAlSi3O8 and Quartz SiO2)) — igneous

Pink Granite / Potassium Feldspar with Quartz

Granite (composed mainly of Orthoclase KAlSi3O8 and Quartz SiO2)

Quartz (Milky/Smoky variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Smoky variety)

Silicon Dioxide (SiO2)

Scoria (Lava Rock) (Scoria (Mafic volcanic rock)) — igneous

Scoria (Lava Rock)

Scoria (Mafic volcanic rock)

Thunder Egg (Agate Core) (Cryptocrystalline Quartz (SiO2) in Rhyolite/Perlite Matrix) — mineral

Thunder Egg (Agate Core)

Cryptocrystalline Quartz (SiO2) in Rhyolite/Perlite Matrix

Sandstone (Arenite (primarily SiO2 with various cementing agents)) — sedimentary

Sandstone

Arenite (primarily SiO2 with various cementing agents)

Granite (Phaneritic Plutonic Felsic Rock) — igneous

Granite

Phaneritic Plutonic Felsic Rock

Basalt (Basalt (extrusive volcanic rock)) — igneous

Basalt

Basalt (extrusive volcanic rock)

Granodiorite Pebble (Granodiorite) — igneous

Granodiorite Pebble

Granodiorite

Pink Tumbled Agate (Silicon Dioxide (SiO2) with dye) — mineral

Pink Tumbled Agate

Silicon Dioxide (SiO2) with dye

Sandstone (Sandstone (SiO2 dominant)) — sedimentary

Sandstone

Sandstone (SiO2 dominant)

Sandstone (Quartzose) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Quartzose)

Arenite (primarily SiO2)