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

Painted Sandstone (Sandstone (clastic sedimentary rock) with acrylic/artistic coating) — sedimentary

Painted Sandstone

Sandstone (clastic sedimentary rock) with acrylic/artistic coating

Coal (Coal (Sedimentary Rock / Organic Rock)) — sedimentary

Coal

Coal (Sedimentary Rock / Organic Rock)

Granite (Intrusive Igneous Rock) — igneous

Granite

Intrusive Igneous Rock

River Cobble (Weathered Granitoid) (Granodiorite / Quartz Diorite) — igneous

River Cobble (Weathered Granitoid)

Granodiorite / Quartz Diorite

Shale with Quartz Veins (Fissile Sedimentary Rock (SiO2)) — sedimentary

Shale with Quartz Veins

Fissile Sedimentary Rock (SiO2)

Basalt (Extrusive mafic igneous rock) — igneous

Basalt

Extrusive mafic igneous rock

Breciated Jasper (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Breciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Eclogite (Eclogite (High-pressure metamorphic rock)) — metamorphic

Eclogite

Eclogite (High-pressure metamorphic rock)

Rugose Coral Fossil (Order Rugosa) — fossil

Rugose Coral Fossil

Order Rugosa

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Basalt (Mafic Igneous Rock (composed primarily of pyroxene and calcium-rich plagioclase)) — igneous

Basalt

Mafic Igneous Rock (composed primarily of pyroxene and calcium-rich plagioclase)

Sandstone (with Iron Staining) (Arenite (primarily SiO2 with Fe2O3/FeO(OH) oxides)) — sedimentary

Sandstone (with Iron Staining)

Arenite (primarily SiO2 with Fe2O3/FeO(OH) oxides)

Granite (Granite) — Igneous

Granite

Granite

Sandstone Pebble / Quartzite Pebble (SiO2 (Silicon Dioxide enriched sedimentary rock)) — sedimentary

Sandstone Pebble / Quartzite Pebble

SiO2 (Silicon Dioxide enriched sedimentary rock)

Basalt (Vesicular Basalt) — igneous

Basalt

Vesicular Basalt

Shale (Lutaceous sedimentary rock) — sedimentary

Shale

Lutaceous sedimentary rock

Banded Gneiss / Veined Metamorphic Pebble (Metamorphic Rock with Quartz/Feldspar Veins) — metamorphic

Banded Gneiss / Veined Metamorphic Pebble

Metamorphic Rock with Quartz/Feldspar Veins

Ironstone Concretion (Ironstone Gourd) (Limonite/Goethite Concretion (FeOO(H))) — sedimentary

Ironstone Concretion (Ironstone Gourd)

Limonite/Goethite Concretion (FeOO(H))

Gneiss (Metamorphic Pebble) (Gneissic Metamorphic Rock) — metamorphic

Gneiss (Metamorphic Pebble)

Gneissic Metamorphic Rock

Chalcedony Geode (Silicon Dioxide (SiO2)) — mineral

Chalcedony Geode

Silicon Dioxide (SiO2)

Shale (Shale (Fine-grained clastic sedimentary rock)) — sedimentary

Shale

Shale (Fine-grained clastic sedimentary rock)

Quartzite with Schist layers (Metamorphosed Quartz-rich Rock (Mixed Schist/Quartzite)) — metamorphic

Quartzite with Schist layers

Metamorphosed Quartz-rich Rock (Mixed Schist/Quartzite)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Dalmation Jasper (Aplite with Arfvedsonite inclusions (SiO2 with Na3(Mg,Fe2+)4AlSi8O22(OH)2)) — igneous

Dalmation Jasper

Aplite with Arfvedsonite inclusions (SiO2 with Na3(Mg,Fe2+)4AlSi8O22(OH)2)

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

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Granodiorite (Granodiorite (Intermediate intrusive igneous rock)) — igneous

Granodiorite

Granodiorite (Intermediate intrusive igneous rock)

Serpentinite (Serpentinite (complex silicate minerals including lizardite, chrysotile, and antigorite: (Mg,Fe)3Si2O5(OH)4)) — metamorphic

Serpentinite

Serpentinite (complex silicate minerals including lizardite, chrysotile, and antigorite: (Mg,Fe)3Si2O5(OH)4)

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

Pink Granite (Phaneritic Plutonic Igneous Rock (high K-feldspar)) — igneous

Pink Granite

Phaneritic Plutonic Igneous Rock (high K-feldspar)

Red Sandstone (Sandstone (principally Quartz with Iron Oxide coating)) — sedimentary

Red Sandstone

Sandstone (principally Quartz with Iron Oxide coating)

Granitic Pebble (Glacial Erratic) (Granite) — igneous

Granitic Pebble (Glacial Erratic)

Granite

Basalt with Vesicles (Vesicular Basalt (comprising Plagioclase Feldspar, Pyroxene, and Olivine)) — igneous

Basalt with Vesicles

Vesicular Basalt (comprising Plagioclase Feldspar, Pyroxene, and Olivine)

Mica Schist (Mica Schist (primarily Muscovite or Biotite sheet silicates)) — metamorphic

Mica Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Shale or Slate with Quartz Veins (Shale (fine-grained clastic sedimentary rock) or Slate (low-grade metamorphic rock formed from shale) with Quartz (SiO2) veins) — Metamorphic, likely Sedimentary with Quartz veins

Shale or Slate with Quartz Veins

Shale (fine-grained clastic sedimentary rock) or Slate (low-grade metamorphic rock formed from shale) with Quartz (SiO2) veins

Metamorphic, likely Sedimentary with Quartz veins

Druzy Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Druzy Quartz Geode

Silicon Dioxide (SiO2)

Plume Agate or Moss Agate (Agate (SiO2)) — mineral

Plume Agate or Moss Agate

Agate (SiO2)

Quartz Veined Basalt (Mafic Volcanic Rock with Microcrystalline Quartz (SiO2)) — igneous

Quartz Veined Basalt

Mafic Volcanic Rock with Microcrystalline Quartz (SiO2)

Brachiopod Fossil (Phylum Brachiopoda) — fossil

Brachiopod Fossil

Phylum Brachiopoda

Vesicular Basalt with Quartz/Chalcedony (Vesicular Basalt (primarily Plagioclase, Pyroxene, and Olivine with SiO2 infill)) — igneous

Vesicular Basalt with Quartz/Chalcedony

Vesicular Basalt (primarily Plagioclase, Pyroxene, and Olivine with SiO2 infill)

Chert (River Pebble) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (River Pebble)

Microcrystalline Quartz (SiO2)

Basalt (Basalt) — igneous

Basalt

Basalt

Granite (Granite (Felsic Plutonic Rock)) — igneous

Granite

Granite (Felsic Plutonic Rock)