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

Sandstone (Banded) (Arenite with Iron Oxide Banding) — sedimentary

Sandstone (Banded)

Arenite with Iron Oxide Banding

Sandstone (with Concretion) (Arenite / Quartzose Sandstone) — sedimentary

Sandstone (with Concretion)

Arenite / Quartzose Sandstone

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

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Sandstone (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone

Clastic sedimentary rock (primarily SiO2)

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

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

Clear Quartz (Faceted Crystal) (Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Faceted Crystal)

Silicon Dioxide (SiO2)

Fossilized Bone Fragment (Vertebrate Fossil Material (Apatite/Calcium Phosphate)) — fossil

Fossilized Bone Fragment

Vertebrate Fossil Material (Apatite/Calcium Phosphate)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Mica Schist (Mica Schist (principally Biotite/Muscovite, Quartz, and Feldspar)) — metamorphic

Mica Schist

Mica Schist (principally Biotite/Muscovite, Quartz, and Feldspar)

Lapis Lazuli (Lapis lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)) — metamorphic

Lapis Lazuli

Lapis lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)

Basalt (Extrusive Igneous Basalt) — igneous

Basalt

Extrusive Igneous Basalt

Serpentinite (Serpentinite (composed primarily of Serpentine minerals: Mg3Si2O5(OH)4)) — metamorphic

Serpentinite

Serpentinite (composed primarily of Serpentine minerals: Mg3Si2O5(OH)4)

Basalt with Vesicular Texture (Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene)) — igneous

Basalt with Vesicular Texture

Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Flagstone (Sedimentary Sandstone / Flagstone) — sedimentary

Flagstone

Sedimentary Sandstone / Flagstone

Crushed Granite Gravel (Granite (Plagioclase feldspar, Quartz, Alkali feldspar, Biotite)) — igneous

Crushed Granite Gravel

Granite (Plagioclase feldspar, Quartz, Alkali feldspar, Biotite)

Basalt Pebble (Basalt) — igneous

Basalt Pebble

Basalt

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

Serpentine

Serpentine group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al)2O5(OH)4)

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

Druzy Quartz on Quartz Base

Silicon Dioxide (SiO2)

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

Serpentine (Serpentinite)

Serpentine group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Fe)2O5(OH)4)

Quartz / Calcite Pebble (SiO2 (Quartz) or CaCO3 (Calcite)) — mineral

Quartz / Calcite Pebble

SiO2 (Quartz) or CaCO3 (Calcite)

Banded Serpentinite (Beach Pebble) (Serpentine-group silicate rock ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Fe,Al)2O5(OH)4)) — metamorphic

Banded Serpentinite (Beach Pebble)

Serpentine-group silicate rock ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Fe,Al)2O5(OH)4)

Serpentinite (or Green Quartz Pebble) (Mg3Si2O5(OH)4 (Serpentine group) / SiO2 (Quartz mix)) — metamorphic

Serpentinite (or Green Quartz Pebble)

Mg3Si2O5(OH)4 (Serpentine group) / SiO2 (Quartz mix)

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Conglomerate (Polymictic Conglomerate) — sedimentary

Conglomerate

Polymictic Conglomerate

Basalt River Stone (Basalt) — igneous

Basalt River Stone

Basalt

Quartz-veined Greywacke (Silicon dioxide (SiO2) in Lithic Sandstone) — sedimentary

Quartz-veined Greywacke

Silicon dioxide (SiO2) in Lithic Sandstone

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

Basalt (River Worn)

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

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

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Unakite (Epidotized Granite) — metamorphic

Unakite

Epidotized Granite

Basalt River Stone (Basalt (Ma-fi-ic Extrusive Igneous Rock)) — igneous

Basalt River Stone

Basalt (Ma-fi-ic Extrusive Igneous Rock)

Lake Superior Agate (Banded Chalcedony (Silicon Dioxide, SiO2)) — mineral

Lake Superior Agate

Banded Chalcedony (Silicon Dioxide, SiO2)

River Pebble (Quartzite/Chert) (Silicon Dioxide (SiO2)) — sedimentary

River Pebble (Quartzite/Chert)

Silicon Dioxide (SiO2)

Quartzite Pebble (Metamorphosed Quartz-rich Sandstone (SiO2)) — metamorphic

Quartzite Pebble

Metamorphosed Quartz-rich Sandstone (SiO2)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Greenstone / Serpentinite (Serpentinite (composed primarily of serpentine minerals: Mg3Si2O5(OH)4)) — metamorphic

Greenstone / Serpentinite

Serpentinite (composed primarily of serpentine minerals: Mg3Si2O5(OH)4)

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

Sandstone (Iron-stained)

Arenite (primarily SiO2 with Fe2O3 staining)

Banded Gneiss (Metamorphic Gneiss) — metamorphic

Banded Gneiss

Metamorphic Gneiss

Sandstone Pebble (Ventifact) (Arenite (mostly SiO2)) — sedimentary

Sandstone Pebble (Ventifact)

Arenite (mostly SiO2)