Rock Identifier

Category

Not A Natural Rock

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

Learn about Not A Natural Rock in the encyclopedia

Asphalt Rock

Rock Gypsum

Coral Rock

Rock Salt

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Chalk

Obsidian

Baddeleyite

Cataclasite

Anorthosite

Kimberlite

Tumbled amethyst (Amethyst, purple variety of quartz (SiO₂)) — gemstone

Tumbled amethyst

Amethyst, purple variety of quartz (SiO₂)

Shale (Argillaceous Sedimentary Rock) — sedimentary

Shale

Argillaceous Sedimentary Rock

Epidote (Unakite component) / Green Quartzite (Ca2(Al,Fe)3(SiO4)3(OH)) — metamorphic

Epidote (Unakite component) / Green Quartzite

Ca2(Al,Fe)3(SiO4)3(OH)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Dyed Agate Slice (Silicon Dioxide (SiO2)) — mineral

Dyed Agate Slice

Silicon Dioxide (SiO2)

Granite (Phaneritic Felsic Igneous Rock) — igneous

Granite

Phaneritic Felsic Igneous Rock

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

Sandstone Pebble / Quartzite Pebble

SiO2 (Silicon Dioxide enriched sedimentary rock)

Likely ironstone concretion (Iron-oxide-cemented sedimentary concretion, commonly hematite/goethite-rich) — sedimentary

Likely ironstone concretion

Iron-oxide-cemented sedimentary concretion, commonly hematite/goethite-rich

Fine-grained gray-green rock, possibly slate or phyllite (Indeterminate from the image; likely low-grade metamorphosed mudstone (slate/phyllite)) — metamorphic

Fine-grained gray-green rock, possibly slate or phyllite

Indeterminate from the image; likely low-grade metamorphosed mudstone (slate/phyllite)

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

Silicon Carbide (Carborundum)

Silicon Carbide, SiC

Aggregate Concrete (Anthropogenic Conglomerate (Technosol)) — sedimentary

Aggregate Concrete

Anthropogenic Conglomerate (Technosol)

Rounded river pebble (Indeterminate lithic clast; likely weathered sandstone or quartz-rich sedimentary rock) — sedimentary

Rounded river pebble

Indeterminate lithic clast; likely weathered sandstone or quartz-rich sedimentary rock

Moldavite (Tektite (Natural Silicate Glass)) — meteorite

Moldavite

Tektite (Natural Silicate Glass)

Unidentified gravel and stone fragments (Mixed, indeterminate lithologies; likely quartz, feldspar, and weathered silicate rock fragments) — sedimentary

Unidentified gravel and stone fragments

Mixed, indeterminate lithologies; likely quartz, feldspar, and weathered silicate rock fragments

Satin Spar (Gypsum) (Gypsum (Satin Spar variety) - CaSO4·2H2O) — mineral

Satin Spar (Gypsum)

Gypsum (Satin Spar variety) - CaSO4·2H2O

Emerald in Matrix (Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities) — mineral

Emerald in Matrix

Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities

Blue Onyx (Dyed Agate/Chalky Chalcedony) (Silicon Dioxide (SiO2) with artificial pigment) — mineral

Blue Onyx (Dyed Agate/Chalky Chalcedony)

Silicon Dioxide (SiO2) with artificial pigment

Citrine (Heat-treated Amethyst) (Citrine Quartz (SiO2)) — Mineral (Tectosilicate)

Citrine (Heat-treated Amethyst)

Citrine Quartz (SiO2)

Mineral (Tectosilicate)

Likely water-worn gray pebble (Not identifiable to a specific rock from this image; possibly fine-grained basalt or another dark river-worn rock) — igneous

Likely water-worn gray pebble

Not identifiable to a specific rock from this image; possibly fine-grained basalt or another dark river-worn rock

Amethyst Geode (Quartz (Silicon Dioxide, SiO2)) — mineral

Amethyst Geode

Quartz (Silicon Dioxide, SiO2)

Rounded river pebble (Lithic sandstone or fine-grained volcanic/metamorphic pebble; exact identity requires testing) — sedimentary

Rounded river pebble

Lithic sandstone or fine-grained volcanic/metamorphic pebble; exact identity requires testing

Agate (Silicon Dioxide (SiO2)) — sedimentary

Agate

Silicon Dioxide (SiO2)

Conglomerate (Clastic Sedimentary Rock (Conglomerate)) — sedimentary

Conglomerate

Clastic Sedimentary Rock (Conglomerate)

Conglomerate (Clastic sedimentary rock (Conglomerate)) — sedimentary

Conglomerate

Clastic sedimentary rock (Conglomerate)

Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

Sandstone (Calcareous Sandstone) (Calcareous Sandstone (primarily SiO2 with CaCO3 cement)) — sedimentary

Sandstone (Calcareous Sandstone)

Calcareous Sandstone (primarily SiO2 with CaCO3 cement)

Titanium Quartz (Aura Quartz) (Silicon Dioxide (SiO2) treated with Titanium) — mineral

Titanium Quartz (Aura Quartz)

Silicon Dioxide (SiO2) treated with Titanium

Polished Black Basalt Pebble (Basalt) — igneous

Polished Black Basalt Pebble

Basalt

Weathered, iron-stained boulder (rock type uncertain) (Unidentified weathered rock; the image does not show enough detail to determine its lithology) — sedimentary

Weathered, iron-stained boulder (rock type uncertain)

Unidentified weathered rock; the image does not show enough detail to determine its lithology

Unidentified gray rock fragment (Undetermined; the image is too blurred for reliable identification) — igneous

Unidentified gray rock fragment

Undetermined; the image is too blurred for reliable identification

Sandstone pebble (Sandstone (Quartz-rich Arenite)) — sedimentary

Sandstone pebble

Sandstone (Quartz-rich Arenite)

Rounded, iron-stained quartz-rich pebble (Quartz-rich clastic rock, likely quartz sandstone or quartzite; exact identification requires examination beyond the image) — sedimentary

Rounded, iron-stained quartz-rich pebble

Quartz-rich clastic rock, likely quartz sandstone or quartzite; exact identification requires examination beyond the image

Weathered quartz-rich pebble (Likely quartzite or quartz-rich sandstone; exact identification is uncertain from the photo) — sedimentary

Weathered quartz-rich pebble

Likely quartzite or quartz-rich sandstone; exact identification is uncertain from the photo

Sandstone (Sedimentary Rock (Quartz arenite / Lithic sandstone)) — sedimentary

Sandstone

Sedimentary Rock (Quartz arenite / Lithic sandstone)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Sandstone (Quartz-rich) (Arenite (composed mainly of SiO2)) — sedimentary

Sandstone (Quartz-rich)

Arenite (composed mainly of SiO2)

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

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone (Arenite (SiO2 based typically)) — sedimentary

Sandstone

Arenite (SiO2 based typically)

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

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Crescent Pebble (Fluviatile Quartzite Pebble) — sedimentary

Crescent Pebble

Fluviatile Quartzite Pebble

Rounded river pebble, likely quartz-rich sandstone or quartzite (Composition and exact rock type cannot be determined from the photo; likely quartz (SiO₂) with minor feldspar and rock fragments) — sedimentary

Rounded river pebble, likely quartz-rich sandstone or quartzite

Composition and exact rock type cannot be determined from the photo; likely quartz (SiO₂) with minor feldspar and rock fragments

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)