Rock Identifier

Category

Not A Rock

Browse not a rock specimens identified by the Rock Identifier community.

Learn about Not A Rock in the encyclopedia

Rock Gypsum

Coral Rock

Rock Salt

Asphalt Rock

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Cataclasite

Anorthosite

Peridotite

Gondite

Phosphorite

Epidosite

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)

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

Granodiorite

Granodiorite (Intermediate intrusive igneous rock)

Red Sandstone (Sedimentary Arenite / Quartzose Sandstone) — sedimentary

Red Sandstone

Sedimentary Arenite / Quartzose Sandstone

Chalcedony Geode (Silicon Dioxide (SiO2)) — mineral

Chalcedony Geode

Silicon Dioxide (SiO2)

Basalt (Extrusive igneous rock primarily composed of plagioclase feldspar and pyroxene) — igneous

Basalt

Extrusive igneous rock primarily composed of plagioclase feldspar and pyroxene

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)

Basalt (Vesicular Basalt) — igneous

Basalt

Vesicular Basalt

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)

Weathered quartz-rich rock, possibly granite or quartzite (Indeterminate; likely quartz–feldspar aggregate, possibly granitic gneiss) — igneous

Weathered quartz-rich rock, possibly granite or quartzite

Indeterminate; likely quartz–feldspar aggregate, possibly granitic gneiss

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Granite with Cupules / Bedrock Mortars (Granite (felsic intrusive plutonic rock)) — igneous

Granite with Cupules / Bedrock Mortars

Granite (felsic intrusive plutonic rock)

Quartzite with Hematite staining (Quartzite (SiO2) with iron oxide inclusions) — metamorphic

Quartzite with Hematite staining

Quartzite (SiO2) with iron oxide inclusions

Halite (Sodium Chloride (NaCl)) — mineral

Halite

Sodium Chloride (NaCl)

Schist (Metamorphic Schist) — metamorphic

Schist

Metamorphic Schist

Coal (Carbonaceous sedimentary rock / Lignite to Bituminous coal) — sedimentary

Coal

Carbonaceous sedimentary rock / Lignite to Bituminous coal

Pyrite-bearing Rock / Pyrite Ore (Iron Sulfide (FeS2) in host rock matrix) — mineral

Pyrite-bearing Rock / Pyrite Ore

Iron Sulfide (FeS2) in host rock matrix

Quartzite (River Pebble) (Meta-quartzite (composed primarily of SiO2)) — metamorphic

Quartzite (River Pebble)

Meta-quartzite (composed primarily of SiO2)

Gneiss Pebble (Gneiss) — metamorphic

Gneiss Pebble

Gneiss

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)

Druzy quartz on matrix (Quartz (SiO₂), likely microcrystalline-to-fine crystalline drusy quartz) — mineral

Druzy quartz on matrix

Quartz (SiO₂), likely microcrystalline-to-fine crystalline drusy quartz

Granite pebble (Granite, a coarse-grained felsic intrusive igneous rock) — igneous

Granite pebble

Granite, a coarse-grained felsic intrusive igneous rock

Likely granite pebble (Granite, a quartz–feldspar–mica intrusive igneous rock) — igneous

Likely granite pebble

Granite, a quartz–feldspar–mica intrusive igneous rock

Granite (Granite; chiefly quartz, feldspar, and mica or amphibole) — igneous

Granite

Granite; chiefly quartz, feldspar, and mica or amphibole

Granite (likely weathered feldspathic granite) (Granite; chiefly quartz (SiO₂), feldspar, and mica/amphibole) — igneous

Granite (likely weathered feldspathic granite)

Granite; chiefly quartz (SiO₂), feldspar, and mica/amphibole

Quartz-bearing granite or pegmatitic rock (Granite, composed mainly of quartz, feldspar, and mica; exact identification is uncertain from the image) — igneous

Quartz-bearing granite or pegmatitic rock

Granite, composed mainly of quartz, feldspar, and mica; exact identification is uncertain from the image

Likely weathered gneiss (Foliated metamorphic rock, commonly quartz–feldspar–mica gneiss) — metamorphic

Likely weathered gneiss

Foliated metamorphic rock, commonly quartz–feldspar–mica gneiss

Coarse-grained gray metamorphic rock, likely gneiss (Biotite–quartz–feldspar gneiss (probable)) — metamorphic

Coarse-grained gray metamorphic rock, likely gneiss

Biotite–quartz–feldspar gneiss (probable)

Granite or granitic gneiss boulders (Quartz–feldspar–mica granitoid; possibly banded gneiss) — igneous

Granite or granitic gneiss boulders

Quartz–feldspar–mica granitoid; possibly banded gneiss

Brachiopod Fossil (Phylum Brachiopoda) — fossil

Brachiopod Fossil

Phylum Brachiopoda

Red Sandstone (Arenite (Ferruginous Sandstone)) — sedimentary

Red Sandstone

Arenite (Ferruginous Sandstone)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Fish Fossil in Limestone (Lycoptera (likely) in Micritic Limestone) — sedimentary

Fish Fossil in Limestone

Lycoptera (likely) in Micritic Limestone

Granite (Granite) — Igneous

Granite

Granite

Shale (Argillaceous Rock) — sedimentary

Shale

Argillaceous Rock

Dark gray-brown stone, likely basalt or fine-grained volcanic rock (Basalt (tentative; likely plagioclase–pyroxene rock)) — igneous

Dark gray-brown stone, likely basalt or fine-grained volcanic rock

Basalt (tentative; likely plagioclase–pyroxene rock)

Rounded gray river pebble, likely basalt or andesite (Fine-grained mafic to intermediate volcanic rock; commonly basalt (plagioclase ± pyroxene/olivine)) — igneous

Rounded gray river pebble, likely basalt or andesite

Fine-grained mafic to intermediate volcanic rock; commonly basalt (plagioclase ± pyroxene/olivine)

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)