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

Quartz Vein with Host Rock (Greywacke/Siltstone) (Silicon Dioxide (SiO2) within Clastic Sedimentary/Metamorphic Matrix) — metamorphic

Quartz Vein with Host Rock (Greywacke/Siltstone)

Silicon Dioxide (SiO2) within Clastic Sedimentary/Metamorphic Matrix

Unakite (Epidote with Quartz and Feldspar) (Unakite (Metasomatized Granitic Rock)) — metamorphic

Unakite (Epidote with Quartz and Feldspar)

Unakite (Metasomatized Granitic Rock)

Quartz Vein in Host Rock (Silicon Dioxide (SiO2) with host rock (often Schist or Basalt)) — mineral

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) with host rock (often Schist or Basalt)

Basalt (River Stone) (Vesicular Basalt) — igneous

Basalt (River Stone)

Vesicular Basalt

Basalt River Pebble (Basalt (Aphanitic Mafic Volcanic Rock)) — igneous

Basalt River Pebble

Basalt (Aphanitic Mafic Volcanic Rock)

Quartzite (Metamorphic rock (SiO2)) — metamorphic

Quartzite

Metamorphic rock (SiO2)

Gastropod Fossil (Class Gastropoda (fossilized)) — fossil

Gastropod Fossil

Class Gastropoda (fossilized)

Silicon Carbide (Carborundum) (Silicon Carbide, SiC) — mineral

Silicon Carbide (Carborundum)

Silicon Carbide, SiC

Sandstone Pebble (Arenite (SiO2 dominated with iron oxide)) — sedimentary

Sandstone Pebble

Arenite (SiO2 dominated with iron oxide)

Crazy Lace Agate (Butterfly Carving) (Silicon Dioxide (Microcrystalline Quartz) - SiO2) — sedimentary

Crazy Lace Agate (Butterfly Carving)

Silicon Dioxide (Microcrystalline Quartz) - SiO2

Quartzite Pebble with Quartz Vein (Metamorphic Sandstone (Quartzite) with Hydrothermal Quartz) — metamorphic

Quartzite Pebble with Quartz Vein

Metamorphic Sandstone (Quartzite) with Hydrothermal Quartz

Fossilized Bone Fragment (Vertebrate Fossil) — fossil

Fossilized Bone Fragment

Vertebrate Fossil

Sandstone Concretion (Carbonate-cemented Sandstone Concretion) — sedimentary

Sandstone Concretion

Carbonate-cemented Sandstone Concretion

Auriferous Quartz (Gold-bearing Quartz) (Silicon Dioxide (SiO2) with trace Gold (Au) and Iron Oxides) — mineral

Auriferous Quartz (Gold-bearing Quartz)

Silicon Dioxide (SiO2) with trace Gold (Au) and Iron Oxides

Brachiopod Fossil in Sedimentary Matrix (Phylum Brachiopoda in Siltstone/Mudstone matrix) — fossil

Brachiopod Fossil in Sedimentary Matrix

Phylum Brachiopoda in Siltstone/Mudstone matrix

Limonite (Ochreous Sandstone) (Hydrous ferric oxides (FeO(OH)qnH2O)) — sedimentary

Limonite (Ochreous Sandstone)

Hydrous ferric oxides (FeO(OH)qnH2O)

Seashell Fragment (Calcium Carbonate (CaCO3) in the form of Aragonite or Calcite) — mineral

Seashell Fragment

Calcium Carbonate (CaCO3) in the form of Aragonite or Calcite

Pet Rock (Man-made Quartzite or Granite Cobble) (Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica) — igneous or metamorphic (base stone); anthropogenic (decoration)

Pet Rock (Man-made Quartzite or Granite Cobble)

Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica

igneous or metamorphic (base stone); anthropogenic (decoration)

Diamond (in Matrix) (Carbon (C)) — mineral

Diamond (in Matrix)

Carbon (C)

Quartz Vein in Metamorphic Rock (Silicon Dioxide (SiO2) within Metasedimentary host) — metamorphic

Quartz Vein in Metamorphic Rock

Silicon Dioxide (SiO2) within Metasedimentary host

Jasper (Silicon Dioxide (SiO2)) — mineral

Jasper

Silicon Dioxide (SiO2)

N/A - Man-made object (Jewelry Chain) (Antiqued or Oxidized Metal Chain (often Steel or Brass)) — Mineral (processed metal)

N/A - Man-made object (Jewelry Chain)

Antiqued or Oxidized Metal Chain (often Steel or Brass)

Mineral (processed metal)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Goethite (Goethite (FeO(OH))) — mineral

Goethite

Goethite (FeO(OH))

Conglomerate with Quartz Inclusions (Conglomerate (clastic sedimentary rock) with internal Quartz (SiO2)) — sedimentary

Conglomerate with Quartz Inclusions

Conglomerate (clastic sedimentary rock) with internal Quartz (SiO2)

Granite (Granite (composed primarily of Quartz SiO2, Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8), and Mica)) — igneous

Granite

Granite (composed primarily of Quartz SiO2, Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8), and Mica)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Pink Granite (Phaneritic Plutonic Rock (Felsic)) — igneous

Pink Granite

Phaneritic Plutonic Rock (Felsic)

Granite (Granite (Alkali-feldspar, Quartz, and Plagioclase composition)) — igneous

Granite

Granite (Alkali-feldspar, Quartz, and Plagioclase composition)

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

Crushed Rock (Basalt)

Basalt (Aphanitic Mafic Igneous Rock)

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

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2)

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Banded Gneiss (Gneiss (Metamorphic Rock)) — metamorphic

Banded Gneiss

Gneiss (Metamorphic Rock)

Gneiss (with Mica and Quartz) (Gneissic Metamorphic Rock) — metamorphic

Gneiss (with Mica and Quartz)

Gneissic Metamorphic Rock

Scoria (Vesicular Basaltic Rock) — igneous

Scoria

Vesicular Basaltic Rock

Sandstone (Arenite (Sedimentary Rock)) — sedimentary

Sandstone

Arenite (Sedimentary Rock)

Sandstone (Sandstone (Quartz-rich sedimentary rock)) — sedimentary

Sandstone

Sandstone (Quartz-rich sedimentary rock)

Quartz Vein in Schist (Quartz-rich Micaceous Schist (SiO2 + phyllosilicates)) — metamorphic

Quartz Vein in Schist

Quartz-rich Micaceous Schist (SiO2 + phyllosilicates)

Fossil Coral in Limestone (Scleractinia (Anthomastodon or similar) in Sedimentary Calcarenite) — fossil

Fossil Coral in Limestone

Scleractinia (Anthomastodon or similar) in Sedimentary Calcarenite

Agate (Silicon dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Agate

Silicon dioxide (SiO2) - Microcrystalline Quartz

Grey Agate (Tumbled) (Silicon Dioxide (SiO2)) — mineral

Grey Agate (Tumbled)

Silicon Dioxide (SiO2)

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)