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

Olivine Weathered Rock (Dunite) (Dunite ((Mg, Fe)2SiO4)) — igneous

Olivine Weathered Rock (Dunite)

Dunite ((Mg, Fe)2SiO4)

Basalt (Aphanitic Mafic Igneous Rock) — igneous

Basalt

Aphanitic Mafic Igneous Rock

Agate (Silicon Dioxide (SiO2)) — mineral

Agate

Silicon Dioxide (SiO2)

Eclogite (Eclogite (Omphacite-Garnet Metamorphic Rock)) — metamorphic

Eclogite

Eclogite (Omphacite-Garnet Metamorphic Rock)

Eclogite (Eclogite (composed primarily of Omphacite and Garnet)) — metamorphic

Eclogite

Eclogite (composed primarily of Omphacite and Garnet)

Massive Quartz with Host Rock (Silicon Dioxide (SiO2)) — mineral

Massive Quartz with Host Rock

Silicon Dioxide (SiO2)

Basalt Porphyry (Porphyritic Basalt) — igneous

Basalt Porphyry

Porphyritic Basalt

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Serpentinite (Serpentinite (composed primarily of minerals in the Serpentine group)) — metamorphic

Serpentinite

Serpentinite (composed primarily of minerals in the Serpentine group)

White Marble (Recrystallized Calcite (CaCO3)) — metamorphic

White Marble

Recrystallized Calcite (CaCO3)

Banded Gneiss (Gneiss (High-grade metamorphic rock)) — metamorphic

Banded Gneiss

Gneiss (High-grade metamorphic rock)

Sandstone (Greywacke) (Arenite / Wacke (Mainly SiO2 with various lithic fragments)) — sedimentary

Sandstone (Greywacke)

Arenite / Wacke (Mainly SiO2 with various lithic fragments)

Basalt with Quartz/Calcite Vein (Amygdaloidal Basalt (matrix) with Mineral Vein filling) — igneous

Basalt with Quartz/Calcite Vein

Amygdaloidal Basalt (matrix) with Mineral Vein filling

Amethyst (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Quartz Druzy Geode (Silicon Dioxide (SiO2) - Crystalline Variety) — mineral

Quartz Druzy Geode

Silicon Dioxide (SiO2) - Crystalline Variety

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

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Boxwork Quartz / Septarian Jasper (Boxwork (SiO2 with iron oxide inclusions)) — metamorphic

Boxwork Quartz / Septarian Jasper

Boxwork (SiO2 with iron oxide inclusions)

Yellow Quartz or Citrine Geode/Cluster (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz or Citrine Geode/Cluster

Silicon Dioxide (SiO2)

Sandstone and River Pebbles (Sedimentary Rock (Sandstone / Quartzite / Chert)) — sedimentary

Sandstone and River Pebbles

Sedimentary Rock (Sandstone / Quartzite / Chert)

Quartz Pebble (Tumbled / River Pebble) (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble (Tumbled / River Pebble)

Silicon Dioxide (SiO2)

Quartz Pebble (Quartzite Pebble) (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble (Quartzite Pebble)

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Desert Rose (Barite Rose / Gypsum Rose) (Barium Sulfate (BaSO4) or Hydrated Calcium Sulfate (CaSO4·2H2O)) — mineral

Desert Rose (Barite Rose / Gypsum Rose)

Barium Sulfate (BaSO4) or Hydrated Calcium Sulfate (CaSO4·2H2O)

River Pebble (Granitic Sandstone) (Clastic sedimentary rock (Lithic Arenite)) — sedimentary

River Pebble (Granitic Sandstone)

Clastic sedimentary rock (Lithic Arenite)

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

Basalt Pebble / Black River Stone

Aphanitic Mafic Igneous Rock (Basalt)

Vesicular Basalt (Basalt (with vesicular texture)) — igneous

Vesicular Basalt

Basalt (with vesicular texture)

Granite Pebble (River Rock) (Granite) — igneous

Granite Pebble (River Rock)

Granite

Sandstone (Iron-stained) (Arenite (composed primarily of SiO2 with Fe2O3 staining)) — sedimentary

Sandstone (Iron-stained)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Gneiss (with Quartz Vein / Pegmatite Banding) (Metamorphic Gneiss) — metamorphic

Gneiss (with Quartz Vein / Pegmatite Banding)

Metamorphic Gneiss

Concretion (Sedimentary Concretion) — sedimentary

Concretion

Sedimentary Concretion

Shatter Cone (Impactite) (Shock-metamorphosed rock) — metamorphic

Shatter Cone (Impactite)

Shock-metamorphosed rock

Dyed Dalmatian Stone (Aplite (Alkali-feldspar granite) with Arfvedsonite) — igneous

Dyed Dalmatian Stone

Aplite (Alkali-feldspar granite) with Arfvedsonite

Sandstone (Arenite (SiO2 based with various mineral cements)) — sedimentary

Sandstone

Arenite (SiO2 based with various mineral cements)

Quartz Crystal (specifically a Double-Terminated variety) (Silicon Dioxide (SiO2) - Low Quartz) — mineral

Quartz Crystal (specifically a Double-Terminated variety)

Silicon Dioxide (SiO2) - Low Quartz

Sandstone (Iron-stained) (Sandstone (rich in Quartz and Hematite/Limonite coatings)) — sedimentary

Sandstone (Iron-stained)

Sandstone (rich in Quartz and Hematite/Limonite coatings)

Agate (SiO2) — Mineral

Agate

SiO2

Wishing Stone (Veined Pebble) (Quartz-veined Metasedimentary Pebble) — metamorphic

Wishing Stone (Veined Pebble)

Quartz-veined Metasedimentary Pebble

Brecciated Jasper or Chert (SiO2) — Sedimentary/Metamorphic

Brecciated Jasper or Chert

SiO2

Sedimentary/Metamorphic

Fossilized Brachiopod (Brachiopoda (Phylum)) — fossil

Fossilized Brachiopod

Brachiopoda (Phylum)

Agate (Silicon Dioxide (Chalcedony), SiO2) — gemstone

Agate

Silicon Dioxide (Chalcedony), SiO2

Claystone Concretion (Septarian Concretion (Ironstone-rich)) — sedimentary

Claystone Concretion

Septarian Concretion (Ironstone-rich)

Peridotite (Olivine Rock) (Peridotite (composed largely of olivine, (Mg, Fe)2SiO4)) — igneous

Peridotite (Olivine Rock)

Peridotite (composed largely of olivine, (Mg, Fe)2SiO4)