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

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

Jasper (Chert) (Silicon Dioxide (SiO2)) — sedimentary

Jasper (Chert)

Silicon Dioxide (SiO2)

Olivine in Basalt matrix (Peridotite (Mg, Fe)2SiO4) — igneous

Olivine in Basalt matrix

Peridotite (Mg, Fe)2SiO4

Amygdaloidal Basalt (Amygdaloidal Basalt (Mafic Extrusive volcanic rock)) — igneous

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Extrusive volcanic rock)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Basalt Porphyry (Porphyritic Basalt) — igneous

Basalt Porphyry

Porphyritic Basalt

Crinoid Fossil in Limestone (Crinoid (Class Crinoidea) in Fossiliferous Limestone (CaCO3)) — sedimentary

Crinoid Fossil in Limestone

Crinoid (Class Crinoidea) in Fossiliferous Limestone (CaCO3)

Limonite (Iron Ore) (Goethite and related iron hydroxides (FeO(OH)·nH2O)) — mineral

Limonite (Iron Ore)

Goethite and related iron hydroxides (FeO(OH)·nH2O)

Unakite (Altered Granite (Unakite)) — metamorphic

Unakite

Altered Granite (Unakite)

Mixed Mineral Collection (with Quartz, Beryl, and host rock) (Silicon Dioxide (Quartz), Be3Al2Si6O18 (Beryl), and associated Schist/Pegmatite) — mineral

Mixed Mineral Collection (with Quartz, Beryl, and host rock)

Silicon Dioxide (Quartz), Be3Al2Si6O18 (Beryl), and associated Schist/Pegmatite

Quartz vein in metamorphic rock (Crystalline Silicon Dioxide (SiO2) in Host Rock) — metamorphic

Quartz vein in metamorphic rock

Crystalline Silicon Dioxide (SiO2) in Host Rock

Pyrite on Limestone (Iron Disulfide (FeS2) in Calcium Carbonate (CaCO3) matrix) — sedimentary (matrix) / mineral (inclusion)

Pyrite on Limestone

Iron Disulfide (FeS2) in Calcium Carbonate (CaCO3) matrix

sedimentary (matrix) / mineral (inclusion)

Note regarding image quality — Indeterminate

Note regarding image quality

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Granite Pebble (Intrusive Felsic Igneous Rock (Granite)) — igneous

Granite Pebble

Intrusive Felsic Igneous Rock (Granite)

Lake Superior Agate (Cryptocrystalline Quartz (SiO2) with iron impurities) — sedimentary

Lake Superior Agate

Cryptocrystalline Quartz (SiO2) with iron impurities

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

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

Serpentine / Antigorite (Mg3Si2O5(OH)4 (Serpentine Group)) — metamorphic

Serpentine / Antigorite

Mg3Si2O5(OH)4 (Serpentine Group)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Basalt Pebble (Basalt) — igneous

Basalt Pebble

Basalt

Quartz / Chalcedony Geode Fragment (Silicon Dioxide (SiO2)) — mineral

Quartz / Chalcedony Geode Fragment

Silicon Dioxide (SiO2)

Basalt Pebble (Basalt (SiO2 range 45-52%)) — igneous

Basalt Pebble

Basalt (SiO2 range 45-52%)

Clear Quartz Point (Silicon Dioxide (SiO2)) — mineral

Clear Quartz Point

Silicon Dioxide (SiO2)

Unakite (Unakite (Epidotized Granite)) — metamorphic

Unakite

Unakite (Epidotized Granite)

Basalt (Basalt (principally Plagioclase Feldspar and Pyroxene)) — igneous

Basalt

Basalt (principally Plagioclase Feldspar and Pyroxene)

Basalt pebble (Basalt) — igneous

Basalt pebble

Basalt

Laterite Gravel with Quartz (Ferruginous Laterite (Fe2O3·nH2O)) — sedimentary

Laterite Gravel with Quartz

Ferruginous Laterite (Fe2O3·nH2O)

Basalt River Stone (Basalt) — igneous

Basalt River Stone

Basalt

Unakite (Unakite (Epidotized Granite)) — metamorphic

Unakite

Unakite (Epidotized Granite)

Basalt River Stone (Basalt) — igneous

Basalt River Stone

Basalt

Granodiorite (Granodiorite) — igneous

Granodiorite

Granodiorite

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Basalt (Phaneritic or Diabase) (Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)) — igneous

Basalt (Phaneritic or Diabase)

Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)

Basalt (with possible epidote or olivine) (Mafic Igneous Rock (primarily Plagioclase and Pyroxene)) — igneous

Basalt (with possible epidote or olivine)

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Basalt (Basalt) — igneous

Basalt

Basalt

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

Basalt with Oxidized Inclusions (Extrusive Mafic Igneous Rock (primarily Plagioclase and Pyroxene)) — igneous

Basalt with Oxidized Inclusions

Extrusive Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Basalt Pebble (Basalt) — igneous

Basalt Pebble

Basalt

Basalt River Stone (Basalt) — igneous

Basalt River Stone

Basalt

Vesicular Basalt (Basalt (Mafic Extrusive)) — igneous

Vesicular Basalt

Basalt (Mafic Extrusive)

Dalmatian Stone (Peralkaline rhyolite) — igneous

Dalmatian Stone

Peralkaline rhyolite