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

Not a rock (Not a rock) — Not a rock

Not a rock

Not a rock

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

Brecciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Fossiliferous Limestone (Fossiliferous Limestone (CaCO3)) — sedimentary

Fossiliferous Limestone

Fossiliferous Limestone (CaCO3)

Shale (Sedimentary rock composed of clay minerals and quartz) — sedimentary

Shale

Sedimentary rock composed of clay minerals and quartz

River Rock (Sedimentary Rock (various compositions)) — sedimentary

River Rock

Sedimentary Rock (various compositions)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

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

Amethyst Quartz

Amethyst (Silicon Dioxide, SiO2)

Geode / Fossilized Gastropod or Shell Cast (Silicon dioxide (Quartz) replacement / fossil mold) — sedimentary

Geode / Fossilized Gastropod or Shell Cast

Silicon dioxide (Quartz) replacement / fossil mold

Sandstone (Sedimentary Rock (Quartz Arenite)) — sedimentary

Sandstone

Sedimentary Rock (Quartz Arenite)

Hag Stone (Chert/Flint with natural perforation) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Hag Stone (Chert/Flint with natural perforation)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Sandstone (Quartzose Sandstone) (Clastic sedimentary rock (SiO2 dominated)) — sedimentary

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (SiO2 dominated)

Sandstone (with minor quartz and possible clay components) (Clastic Sedimentary Rock (SiO2 dominated)) — sedimentary

Sandstone (with minor quartz and possible clay components)

Clastic Sedimentary Rock (SiO2 dominated)

River Pebble (Siliceous rock fragment / Quartzite / Sandstone pebble) — sedimentary

River Pebble

Siliceous rock fragment / Quartzite / Sandstone pebble

Sandstone (Arenite (SiO2 principal)) — sedimentary

Sandstone

Arenite (SiO2 principal)

Pumice (Pumice (Felsic vesicular volcanic glass)) — igneous

Pumice

Pumice (Felsic vesicular volcanic glass)

Amethyst (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Vesicular Basalt (Vesicular Basalt (Mafic Volcanic Rock)) — igneous

Vesicular Basalt

Vesicular Basalt (Mafic Volcanic Rock)

Basalt Pebble (Basalt) — igneous

Basalt Pebble

Basalt

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

Dyed Agate Slice

Silicon Dioxide (SiO2) - Chalcedony variety

Shale (possibly Carbonaceous or Oil Shale) (Argillaceous Sedimentary Rock) — sedimentary

Shale (possibly Carbonaceous or Oil Shale)

Argillaceous Sedimentary Rock

Gneiss (Banded Gneiss Cobble) (Gneiss) — metamorphic

Gneiss (Banded Gneiss Cobble)

Gneiss

River Pebbles (Quartzite / Granite Pebbles) (SiO2 (Quartz-rich detrital gravel)) — sedimentary

River Pebbles (Quartzite / Granite Pebbles)

SiO2 (Quartz-rich detrital gravel)

River Agate (Chert/Chalcedony) (Cryptocrystalline Quartz (SiO2)) — sedimentary

River Agate (Chert/Chalcedony)

Cryptocrystalline Quartz (SiO2)

Rounded granitic pebble (Granite, likely biotite granite or granodiorite) — igneous

Rounded granitic pebble

Granite, likely biotite granite or granodiorite

Pebble (Lithic fragment / Weathered rock fragment) — sedimentary

Pebble

Lithic fragment / Weathered rock fragment

Shale (Fissile mudrock (composed primarily of clay minerals and quartz)) — sedimentary

Shale

Fissile mudrock (composed primarily of clay minerals and quartz)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Obsidian (Volcanic Glass) — igneous

Obsidian

Volcanic Glass

Sandstone (Heart-shaped pebble) (Sedimentary Quartz Sandstone) — sedimentary

Sandstone (Heart-shaped pebble)

Sedimentary Quartz Sandstone

Aura Quartz (Coated Quartz) (Silicon Dioxide (SiO2) treated with metallic vapor) — mineral

Aura Quartz (Coated Quartz)

Silicon Dioxide (SiO2) treated with metallic vapor

Shale with Iron Staining (Fissile Mudrock (Sedimentary Rock)) — sedimentary

Shale with Iron Staining

Fissile Mudrock (Sedimentary Rock)

Porphyry (Porphyritic Andesite / Basaltic Porphyry) — igneous

Porphyry

Porphyritic Andesite / Basaltic Porphyry

Sandstone (Sandstone (SiO2 dominated)) — sedimentary

Sandstone

Sandstone (SiO2 dominated)

Veined Quartzite Pebble (Heart-Shaped) (Metamorphosed quartz-rich sandstone with quartz veins) — sedimentary

Veined Quartzite Pebble (Heart-Shaped)

Metamorphosed quartz-rich sandstone with quartz veins

Shale (Shale (Lutite)) — sedimentary

Shale

Shale (Lutite)

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Vesicular Basalt or Scoria (Basalt (extrusive volcanic rock)) — igneous

Vesicular Basalt or Scoria

Basalt (extrusive volcanic rock)

Shale (Argillaceous Sedimentary Rock) — sedimentary

Shale

Argillaceous Sedimentary Rock

Amethyst and Agate Geode Section (Silicon Dioxide (SiO2) - Crystalline Quartz and Chalcedony) — mineral

Amethyst and Agate Geode Section

Silicon Dioxide (SiO2) - Crystalline Quartz and Chalcedony

Sandstone (Sandstone (composed predominantly of SiO2)) — sedimentary

Sandstone

Sandstone (composed predominantly of SiO2)

Red Sandstone (Arenite (SiO2 with Fe2O3)) — sedimentary

Red Sandstone

Arenite (SiO2 with Fe2O3)

Beach Pebble (Basalt / Greywacke Gravel) (Mafic Volcanic Rock (Basalt)) — igneous

Beach Pebble (Basalt / Greywacke Gravel)

Mafic Volcanic Rock (Basalt)