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 (River Stone) (Extrusive mafic igneous rock) — igneous

Basalt (River Stone)

Extrusive mafic igneous rock

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

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Unakite (Epidotized Granite) — metamorphic

Unakite

Epidotized Granite

Fossil Coral (Scleractinia (fossilized calcium carbonate)) — sedimentary

Fossil Coral

Scleractinia (fossilized calcium carbonate)

Sandstone (Sandstone (SiO2 dominant)) — sedimentary

Sandstone

Sandstone (SiO2 dominant)

Vesicular Basalt (Basalt with a vesicular texture) — igneous

Vesicular Basalt

Basalt with a vesicular texture

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Limestone Cobble (Sedimentary Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Limestone Cobble

Sedimentary Limestone (Calcium Carbonate, CaCO3)

Sandstone (Ferruginous) (Arenite with Iron-Oxide Cement) — sedimentary

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Basalt with Quartz/Calcite matrix (Basalt (SiO2 with Ca/Mg/Fe silicates) on a Mineral Matrix) — igneous

Basalt with Quartz/Calcite matrix

Basalt (SiO2 with Ca/Mg/Fe silicates) on a Mineral Matrix

Quartzite (Metamorphosed Quartz Sandstone (SiO2)) — metamorphic

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Sandstone (Quartzose Sandstone) (Arenite (SiO2 principal component)) — sedimentary

Sandstone (Quartzose Sandstone)

Arenite (SiO2 principal component)

Red Sandstone (Arenite (Ferruginous Sandstone)) — sedimentary

Red Sandstone

Arenite (Ferruginous Sandstone)

Basalt River Stone with Quartz Vein (Basalt (Mafic volcanic rock)) — igneous

Basalt River Stone with Quartz Vein

Basalt (Mafic volcanic rock)

Sandstone (Sandstone (Arenite)) — sedimentary

Sandstone

Sandstone (Arenite)

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Sandstone (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone

Arenite (composed primarily of SiO2)

Green Quartzite (Metamorphic Quartz Sandstone (SiO2)) — metamorphic

Green Quartzite

Metamorphic Quartz Sandstone (SiO2)

Banded Calcite (often sold as 'Travertine' or 'Mexican Onyx') (Calcium Carbonate (CaCO3)) — sedimentary

Banded Calcite (often sold as 'Travertine' or 'Mexican Onyx')

Calcium Carbonate (CaCO3)

Basalt (Aphanitic Mafic Igneous Rock) — igneous

Basalt

Aphanitic Mafic Igneous Rock

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

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Basalt (River Stone) (Basalt) — igneous

Basalt (River Stone)

Basalt

River Cobble (Quartzite or Sandstone) (Arenite or Meta-quartzite (SiO2 composition)) — sedimentary

River Cobble (Quartzite or Sandstone)

Arenite or Meta-quartzite (SiO2 composition)

Basalt (Basalt (primarily Plagioclase feldspar and Pyroxene)) — igneous

Basalt

Basalt (primarily Plagioclase feldspar and Pyroxene)

Sandstone (Arenite (Siliclastic Sedimentary Rock)) — sedimentary

Sandstone

Arenite (Siliclastic Sedimentary Rock)

Vesicular Basalt (Amygdaloidal Basalt) (Basalt with Secondary Mineral Inclusions) — igneous

Vesicular Basalt (Amygdaloidal Basalt)

Basalt with Secondary Mineral Inclusions

Sandstone (Water-worn pebble) (Sedimentary Rock (Quartz arenite)) — sedimentary

Sandstone (Water-worn pebble)

Sedimentary Rock (Quartz arenite)

Banded Chert or Unakite-like Rock (Epidotized Granulite or Jasperoid Chert) — metamorphic

Banded Chert or Unakite-like Rock

Epidotized Granulite or Jasperoid Chert

Pumice (Pumice (a frothy volcanic glass)) — igneous

Pumice

Pumice (a frothy volcanic glass)

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)

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)

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)