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

Weathered River Rock (likely Chert or Basalt with algae) (Silicon dioxide (SiO2) with organic biofilm) — sedimentary

Weathered River Rock (likely Chert or Basalt with algae)

Silicon dioxide (SiO2) with organic biofilm

Basalt (Vesicular) (Mafic Volcanic Rock (rich in Magnesium and Iron)) — Igneous

Basalt (Vesicular)

Mafic Volcanic Rock (rich in Magnesium and Iron)

Agate (Chalcedony (SiO2)) — mineral

Agate

Chalcedony (SiO2)

Fossilized Gastropod Shell (Gastropoda (Class) replacement / internal cast (steinkern)) — fossil

Fossilized Gastropod Shell

Gastropoda (Class) replacement / internal cast (steinkern)

Blue Agate (Dyed Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Blue Agate (Dyed Chalcedony)

Silicon Dioxide (SiO2)

Quartz Druzy (on Matrix) (Silicon Dioxide (SiO2)) — mineral

Quartz Druzy (on Matrix)

Silicon Dioxide (SiO2)

Chert Nodules in Limestone (Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)) — sedimentary

Chert Nodules in Limestone

Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)

Chert Nodules or Concretion (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert Nodules or Concretion

Cryptocrystalline Quartz (SiO2)

Wishing Stone (Basalt/Siltstone with Quartz/Calcite vein) (Carbonaceous Siltstone with Quartz (SiO2) or Calcite (CaCO3) vein) — sedimentary

Wishing Stone (Basalt/Siltstone with Quartz/Calcite vein)

Carbonaceous Siltstone with Quartz (SiO2) or Calcite (CaCO3) vein

Basalt River Pebble (Extrusive mafic igneous rock) — igneous

Basalt River Pebble

Extrusive mafic igneous rock

Chert (Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline Quartz (SiO2)

Conglomerate (Polymictic Conglomerate) — sedimentary

Conglomerate

Polymictic Conglomerate

Quartz (Milky Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Druzy Quartz on Sandstone (Silicon Dioxide (SiO2) with Quartz crystals) — sedimentary

Druzy Quartz on Sandstone

Silicon Dioxide (SiO2) with Quartz crystals

Quartz (White/Milky) (Silicon Dioxide (SiO2)) — mineral

Quartz (White/Milky)

Silicon Dioxide (SiO2)

Gneiss with Quartz Vein (Metamorphic Gneiss with Quartz (SiO2) and Feldspar Injection) — metamorphic

Gneiss with Quartz Vein

Metamorphic Gneiss with Quartz (SiO2) and Feldspar Injection

Crushed Granite / Landscaping Gravel (Granitoid) — igneous

Crushed Granite / Landscaping Gravel

Granitoid

Granodiorite (Granodiorite) — igneous

Granodiorite

Granodiorite

Sandstone (Pebble) (Arenite) — sedimentary

Sandstone (Pebble)

Arenite

Serpentine (Antigorite/Lizardite/Chrysotile group, Mg3Si2O5(OH)4) — metamorphic

Serpentine

Antigorite/Lizardite/Chrysotile group, Mg3Si2O5(OH)4

Serpentine (Antigorite/Lizardite (Mg, Fe)3Si2O5(OH)4) — metamorphic

Serpentine

Antigorite/Lizardite (Mg, Fe)3Si2O5(OH)4

Granodiorite (Granodiorite (containing Plagioclase, Quartz, and Biotite)) — igneous

Granodiorite

Granodiorite (containing Plagioclase, Quartz, and Biotite)

Granodiorite with Biotite Mica (Granodiorite (containing Quartz, Plagioclase Feldspar, and Biotite Mica)) — igneous

Granodiorite with Biotite Mica

Granodiorite (containing Quartz, Plagioclase Feldspar, and Biotite Mica)

Basalt with Quartz Vein (Mafic Igneous Rock (SiO2 filling)) — igneous

Basalt with Quartz Vein

Mafic Igneous Rock (SiO2 filling)

Granite (Granite) — igneous

Granite

Granite

Conglomerate (Conglomeratic Sandstone) — sedimentary

Conglomerate

Conglomeratic Sandstone

Basalt (with Iron Staining) (Mafic Igneous Rock) — igneous

Basalt (with Iron Staining)

Mafic Igneous Rock

Quartzite (Water-worn Cobble) (Quartzite (Composition: 90%+ SiO2)) — metamorphic

Quartzite (Water-worn Cobble)

Quartzite (Composition: 90%+ SiO2)

Geode or Concretion (Silica-filled nodule (likely SiO2)) — sedimentary

Geode or Concretion

Silica-filled nodule (likely SiO2)

Basalt (Basalt (dominated by plagioclase feldspar and pyroxene)) — igneous

Basalt

Basalt (dominated by plagioclase feldspar and pyroxene)

Shale or Mudstone (Argillaceous sedimentary rock) — sedimentary

Shale or Mudstone

Argillaceous sedimentary rock

Basalt (Mafic Igneous Rock (Basalt)) — igneous

Basalt

Mafic Igneous Rock (Basalt)

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

Conglomerate (Conglomerate (a clastic sedimentary rock)) — Sedimentary Rock

Conglomerate

Conglomerate (a clastic sedimentary rock)

Sedimentary Rock

Granite (Felsic intrusive igneous rock) — igneous

Granite

Felsic intrusive igneous rock

Granite (Felsic intrusive igneous rock) — igneous

Granite

Felsic intrusive igneous rock

Conglomerate (Conglomerate (Clastic Sedimentary Rock)) — sedimentary

Conglomerate

Conglomerate (Clastic Sedimentary Rock)

Quartzite (Metamorphosed Quartz Sandstone (SiO2)) — metamorphic

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Desert Rose (Gypsum (variety Selenite) - CaSO4·2H2O) — mineral

Desert Rose

Gypsum (variety Selenite) - CaSO4·2H2O

Quartzite River Rock (Metamorphosed Quartz-rich Sandstone (SiO2)) — metamorphic

Quartzite River Rock

Metamorphosed Quartz-rich Sandstone (SiO2)

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

Quartzite River Rock

Metamorphic Quartzite (primarily SiO2)

Sandstone (Ferruginous) (Arenite (primarily SiO2 with iron oxide cement)) — sedimentary

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide cement)