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

Dalmation Stone (often called Dalmatian Jasper) (Peralkaline Rock (Microgranite/Aplite), SiO2 with inclusions of Arfvedsonite) — igneous

Dalmation Stone (often called Dalmatian Jasper)

Peralkaline Rock (Microgranite/Aplite), SiO2 with inclusions of Arfvedsonite

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Basalt River Stone (Basalt (Aphanitic Mafic Igneous Rock)) — igneous

Basalt River Stone

Basalt (Aphanitic Mafic Igneous Rock)

Serpentinite (Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4) — metamorphic

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Basalt with Quartz Veining (Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene)) — igneous

Basalt with Quartz Veining

Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

River Stone (Basalt or fine-grained Schist) (Mafic Igneous Rock / Volcanic Basalt) — igneous

River Stone (Basalt or fine-grained Schist)

Mafic Igneous Rock / Volcanic Basalt

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

Quartz Crystal Point

Silicon Dioxide (SiO2)

Basalt (Basalt (Aphanitic Mafic Igneous Rock)) — igneous

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Basalt Beach Pebble (Basalt (Aphanitic Mafic Igneous Rock)) — igneous

Basalt Beach Pebble

Basalt (Aphanitic Mafic Igneous Rock)

Basalt (Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)) — igneous

Basalt

Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

River Stone (Basalt) (Basalt (Aphanitic Mafic Igneous Rock)) — igneous

River Stone (Basalt)

Basalt (Aphanitic Mafic Igneous Rock)

Basalt (River Stone) (Basalt) — igneous

Basalt (River Stone)

Basalt

River Stone (likely Basalt or Greywacke) (Basalt (fine-grained mafic igneous rock)) — igneous

River Stone (likely Basalt or Greywacke)

Basalt (fine-grained mafic igneous rock)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Basalt River Stone (Basalt) — igneous

Basalt River Stone

Basalt

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Basalt (Basalt (Aphanitic Mafic Volcanic)) — igneous

Basalt

Basalt (Aphanitic Mafic Volcanic)

River Stone (Basalt) (Basalt) — igneous

River Stone (Basalt)

Basalt

Basalt (Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)) — igneous

Basalt

Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)

Quartzite Pebble (Quartzite (SiO2)) — metamorphic

Quartzite Pebble

Quartzite (SiO2)

Pink Granite (Granite (enriched in Potassium Feldspar)) — igneous

Pink Granite

Granite (enriched in Potassium Feldspar)

Unakite (Epidotized Granite) — metamorphic

Unakite

Epidotized Granite

Granite (Granite (compositionally of Quartz, Alkali Feldspar, and Plagioclase)) — igneous

Granite

Granite (compositionally of Quartz, Alkali Feldspar, and Plagioclase)

Basalt (Basalt (dominated by Plagioclase and Pyroxene)) — igneous

Basalt

Basalt (dominated by Plagioclase and Pyroxene)

Sandstone (Pebble/Cobble) (Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)) — Sedimentary

Sandstone (Pebble/Cobble)

Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)

Basalt with Quartz/Feldspar Vein (Mafic Volcanic Rock (Basalt) with SiO2 hydrothermal vein) — igneous

Basalt with Quartz/Feldspar Vein

Mafic Volcanic Rock (Basalt) with SiO2 hydrothermal vein

Peridot in Basalt (Olivine ((Mg, Fe)2SiO4) in Basalt) — mineral

Peridot in Basalt

Olivine ((Mg, Fe)2SiO4) in Basalt

Granite (Granite (Felsic Plutonic Rock)) — igneous

Granite

Granite (Felsic Plutonic Rock)

Granite (Granite (Felsic Plutonic Rock)) — Igneous

Granite

Granite (Felsic Plutonic Rock)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Desert Rose (Gypsum / Barite Rose)

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

Sandstone (Sandstone (SiO2 predominant)) — sedimentary

Sandstone

Sandstone (SiO2 predominant)

Sandstone Pebble (Sandstone (Siliciclastic Sedimentary Rock)) — sedimentary

Sandstone Pebble

Sandstone (Siliciclastic Sedimentary Rock)

Quartz pebble (Quartzite / Chert) (Silicon Dioxide (SiO2)) — sedimentary

Quartz pebble (Quartzite / Chert)

Silicon Dioxide (SiO2)

Beach Pebble (Basalt / Greywacke Gravel) (Mafic Volcanic Rock (Basalt)) — igneous

Beach Pebble (Basalt / Greywacke Gravel)

Mafic Volcanic Rock (Basalt)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Diorite (River Cobble) (Intermediate phaneritic igneous rock) — igneous

Diorite (River Cobble)

Intermediate phaneritic igneous rock

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

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

River Pebbles / Mudstone (Sedimentary Rock / Silty Claystone) — sedimentary

River Pebbles / Mudstone

Sedimentary Rock / Silty Claystone

Quartz Geode Cluster (Iron-stained Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz Geode Cluster (Iron-stained Quartz)

Silicon Dioxide (SiO2)

Yellow Chalcedony (Carnelian / Agate Pebbles) (Silicon Dioxide (SiO2)) — mineral

Yellow Chalcedony (Carnelian / Agate Pebbles)

Silicon Dioxide (SiO2)

Sandstone Pebble (Ferruginous Sandstone (SiO2 with Fe2O3)) — sedimentary

Sandstone Pebble

Ferruginous Sandstone (SiO2 with Fe2O3)