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

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Conglomerate (Asphaltic/Anthropogenic) (Clastic sedimentary rock / Bituminous mixture) — sedimentary

Conglomerate (Asphaltic/Anthropogenic)

Clastic sedimentary rock / Bituminous mixture

Pumice (Pumice (Vesicular Felsic Igneous Rock)) — igneous

Pumice

Pumice (Vesicular Felsic Igneous Rock)

Yellow Quartz (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz

Silicon Dioxide (SiO2)

Possible weathered iron-rich rock or slag fragment (Indeterminate; likely limonite/goethite-bearing material, possibly iron slag) — mineral

Possible weathered iron-rich rock or slag fragment

Indeterminate; likely limonite/goethite-bearing material, possibly iron slag

Shale (Argillaceous sedimentary rock) — sedimentary

Shale

Argillaceous sedimentary rock

Granite (Felsic intrusive igneous rock) — igneous

Granite

Felsic intrusive igneous rock

Red coral (coral beads) (Precious coral, usually Corallium spp.; composed primarily of calcium carbonate (calcite)) — gemstone

Red coral (coral beads)

Precious coral, usually Corallium spp.; composed primarily of calcium carbonate (calcite)

Unidentified rough rock fragment (Indeterminate; no diagnostic mineral or texture can be confirmed from the image) — igneous

Unidentified rough rock fragment

Indeterminate; no diagnostic mineral or texture can be confirmed from the image

Pyrite Nodule (Iron Sulfide (FeS2)) — mineral

Pyrite Nodule

Iron Sulfide (FeS2)

Concrete (Anthropogenic Conglomerate) — sedimentary

Concrete

Anthropogenic Conglomerate

Water-worn river pebble (Unidentified fine-grained siliciclastic rock; likely sandstone or siltstone) — sedimentary

Water-worn river pebble

Unidentified fine-grained siliciclastic rock; likely sandstone or siltstone

Hag Stone (Naturally holed stone (typically sedimentary rock such as flint, limestone, or sandstone)) — Sedimentary

Hag Stone

Naturally holed stone (typically sedimentary rock such as flint, limestone, or sandstone)

Small polished gemstone bead, possibly banded agate (Unconfirmed; agate is microcrystalline quartz (SiO₂)) — gemstone

Small polished gemstone bead, possibly banded agate

Unconfirmed; agate is microcrystalline quartz (SiO₂)

Shale with Vein Infillings (Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.) — Sedimentary Rock

Shale with Vein Infillings

Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.

Sedimentary Rock

Weathered quartz-rich pebble (Likely granitoid (quartz and feldspar), but the photo does not support a precise identification) — igneous

Weathered quartz-rich pebble

Likely granitoid (quartz and feldspar), but the photo does not support a precise identification

Granite (Granite (Felsic Plutonic Rock)) — igneous

Granite

Granite (Felsic Plutonic Rock)

Porphyritic Basalt or Spotted Pebble (Porphyritic volcanic rock with phenocrysts) — igneous

Porphyritic Basalt or Spotted Pebble

Porphyritic volcanic rock with phenocrysts

Dyed Agate Geode (Silicon Dioxide (SiO2) - Chalcedony variety) — mineral

Dyed Agate Geode

Silicon Dioxide (SiO2) - Chalcedony variety

Likely silver-gray metallic ore fragment (Unidentified metallic mineral; possibly galena (PbS), but the image is insufficient for a confident identification) — mineral

Likely silver-gray metallic ore fragment

Unidentified metallic mineral; possibly galena (PbS), but the image is insufficient for a confident identification

Dark pebble with pale mineral patches (Likely porphyritic basalt or andesite; identification is uncertain from the photograph) — igneous

Dark pebble with pale mineral patches

Likely porphyritic basalt or andesite; identification is uncertain from the photograph

Agate (Carnelian / Chalcedony pebble) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — mineral

Agate (Carnelian / Chalcedony pebble)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Opal (Hydrated silica (SiO2 "NH2O)) — mineraloid

Opal

Hydrated silica (SiO2 "NH2O)

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

Sandstone (Quartzose)

Arenite (primarily SiO2)

Shale (Sedimentary pelitic rock) — sedimentary

Shale

Sedimentary pelitic rock

Basalt (Greenstone/Water-worn Pebble) (Basalt (containing Chlorite/Epidote)) — igneous

Basalt (Greenstone/Water-worn Pebble)

Basalt (containing Chlorite/Epidote)

Pearl (Nacre (aragonite, CaCO₃, with conchiolin)) — gemstone

Pearl

Nacre (aragonite, CaCO₃, with conchiolin)

Polished black obsidian (Volcanic glass; primarily silica-rich rhyolitic composition (SiO₂)) — igneous

Polished black obsidian

Volcanic glass; primarily silica-rich rhyolitic composition (SiO₂)

Quartz Pebble / River Siltstone (Silicon Dioxide (SiO2) / Fine-grained Sedimentary Rock) — sedimentary

Quartz Pebble / River Siltstone

Silicon Dioxide (SiO2) / Fine-grained Sedimentary Rock

Sandstone (Sedimentary rock composed mainly of quartz sand) — sedimentary

Sandstone

Sedimentary rock composed mainly of quartz sand

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Granite (Intrusive Igneous Rock) — igneous

Granite

Intrusive Igneous Rock

Red-brown pebble, possibly iron-stained sandstone (Indeterminate from the image; likely iron-oxide-stained quartz-rich rock) — sedimentary

Red-brown pebble, possibly iron-stained sandstone

Indeterminate from the image; likely iron-oxide-stained quartz-rich rock

Rhinestone (or glass crystal) (Silicon dioxide (if glass) / Various) — Mineral/gemstone imitation

Rhinestone (or glass crystal)

Silicon dioxide (if glass) / Various

Mineral/gemstone imitation

Heart-shaped River Rock (Siliciclastic Sedimentary Rock) — sedimentary

Heart-shaped River Rock

Siliciclastic Sedimentary Rock

Chert (Yellow Jasper) (Silicon dioxide (SiO2) with iron oxide inclusions) — sedimentary

Chert (Yellow Jasper)

Silicon dioxide (SiO2) with iron oxide inclusions

Sandstone / Chert Pebble (Silicon Dioxide / Sedimentary Rock (SiO2)) — sedimentary

Sandstone / Chert Pebble

Silicon Dioxide / Sedimentary Rock (SiO2)

Small rounded pebble (likely quartz-rich stone) (Undetermined; possibly quartzite or a quartz-rich river pebble) — igneous

Small rounded pebble (likely quartz-rich stone)

Undetermined; possibly quartzite or a quartz-rich river pebble

Rounded pebble, likely quartz-rich sandstone or weathered granite (Indeterminate lithic clast; possible granite or quartzose sandstone) — igneous

Rounded pebble, likely quartz-rich sandstone or weathered granite

Indeterminate lithic clast; possible granite or quartzose sandstone

Flagstone (Sandstone or Limestone) — sedimentary

Flagstone

Sandstone or Limestone

Granite Pebble (River Rock) (Granite) — igneous

Granite Pebble (River Rock)

Granite