Rock Identifier

Category

Not A Rock (Synthetic Material)

Browse not a rock (synthetic material) specimens identified by the Rock Identifier community.

Learn about Not A Rock (Synthetic Material) in the encyclopedia

Dunite

Metarhyolite

Limonite

Rock Salt

Coral Rock

Rock Gypsum

Asphalt Rock

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Yttrium Aluminum Garnet

Yttrium Aluminum Garnet

Zincite

Opalite

Basalt (Basalt) — igneous

Basalt

Basalt

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Sandstone (likely Ferruginous) (Arenite (SiO2 based with Fe2O3/FeO(OH) cement)) — sedimentary

Sandstone (likely Ferruginous)

Arenite (SiO2 based with Fe2O3/FeO(OH) cement)

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Granite or granitic gneiss (Felsic granitoid, chiefly quartz, feldspar, and mica; possibly weakly foliated gneiss) — igneous

Granite or granitic gneiss

Felsic granitoid, chiefly quartz, feldspar, and mica; possibly weakly foliated gneiss

Chert (Field Stone/Pebble) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Field Stone/Pebble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Quartzite (Quartzite (Metamorphic rock primarily composed of SiO2)) — metamorphic

Quartzite

Quartzite (Metamorphic rock primarily composed of SiO2)

Likely polished dark stone or glassy mineral bead (Indeterminate; possibly obsidian, hematite, or a dark agate) — mineral

Likely polished dark stone or glassy mineral bead

Indeterminate; possibly obsidian, hematite, or a dark agate

Bauxite (Bauxite (Al2O3·2H2O)) — sedimentary

Bauxite

Bauxite (Al2O3·2H2O)

Weathered quartz-rich rock, possibly chert or milky quartz (Mostly microcrystalline or crystalline quartz (SiO₂), identification uncertain from photograph) — mineral

Weathered quartz-rich rock, possibly chert or milky quartz

Mostly microcrystalline or crystalline quartz (SiO₂), identification uncertain from photograph

Quartzite Fragment (Crystalline Silicon Dioxide (SiO2)) — metamorphic

Quartzite Fragment

Crystalline Silicon Dioxide (SiO2)

Sandstone (Pebble) (Sandstone (arenite, arkose, wacke depending on composition)) — sedimentary

Sandstone (Pebble)

Sandstone (arenite, arkose, wacke depending on composition)

Granite (with Quartz Vein and Biotite) (Granite (Plutonic Igneous Rock)) — igneous

Granite (with Quartz Vein and Biotite)

Granite (Plutonic Igneous Rock)

Diorite (Intermediate Phaneritic Igneous Rock) — igneous

Diorite

Intermediate Phaneritic Igneous Rock

Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

Limestone (Fossiliferous) (Sedimentary Carbonate Rock (CaCO3)) — sedimentary

Limestone (Fossiliferous)

Sedimentary Carbonate Rock (CaCO3)

Basalt (Aphanitic Mafic Igneous Rock) — igneous

Basalt

Aphanitic Mafic Igneous Rock

Weathered sandstone pebble (Clastic sandstone, predominantly quartz (SiO₂) grains cemented by silica, calcite, or iron oxides) — sedimentary

Weathered sandstone pebble

Clastic sandstone, predominantly quartz (SiO₂) grains cemented by silica, calcite, or iron oxides

Chert / River Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Chert / River Jasper

Microcrystalline Quartz (SiO2)

Chert (Chalk-associated Flint) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Chalk-associated Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Weathered gray metamorphic rock, likely phyllite or slate (Micaceous quartz–phyllosilicate rock; commonly quartz + muscovite/illite ± chlorite) — metamorphic

Weathered gray metamorphic rock, likely phyllite or slate

Micaceous quartz–phyllosilicate rock; commonly quartz + muscovite/illite ± chlorite

Likely weathered quartz-rich rock fragment (Uncertain; possibly granitic pegmatite or quartz-bearing metamorphic rock) — igneous

Likely weathered quartz-rich rock fragment

Uncertain; possibly granitic pegmatite or quartz-bearing metamorphic rock

Fossilized Shark Tooth (Chondrichthyes tooth) — fossil

Fossilized Shark Tooth

Chondrichthyes tooth

Tumbled orange chalcedony (likely carnelian) (Carnelian, a cryptocrystalline variety of quartz (SiO₂)) — gemstone

Tumbled orange chalcedony (likely carnelian)

Carnelian, a cryptocrystalline variety of quartz (SiO₂)

Weathered iron-rich rock, possibly basalt or ironstone (Indeterminate; likely Fe-oxide-bearing basaltic rock (commonly magnetite/hematite in a silicate matrix)) — igneous

Weathered iron-rich rock, possibly basalt or ironstone

Indeterminate; likely Fe-oxide-bearing basaltic rock (commonly magnetite/hematite in a silicate matrix)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Fossilized Shark Tooth (Chondrichthyes (Class)) — fossil

Fossilized Shark Tooth

Chondrichthyes (Class)

Granite River Stone (Phaneritic Felsic Igneous Rock) — igneous

Granite River Stone

Phaneritic Felsic Igneous Rock

Gabbroic rock, possibly hornblende gabbro (Gabbro; coarse-grained mafic silicate rock dominated by plagioclase and pyroxene, with possible hornblende and magnetite) — igneous

Gabbroic rock, possibly hornblende gabbro

Gabbro; coarse-grained mafic silicate rock dominated by plagioclase and pyroxene, with possible hornblende and magnetite

Banded Chert (Ironstone/Jasper) (Cryptocrystalline Quartz (SiO2) with Iron Oxides) — sedimentary

Banded Chert (Ironstone/Jasper)

Cryptocrystalline Quartz (SiO2) with Iron Oxides

Tufa (Calcareous Tufa (CaCO3)) — sedimentary

Tufa

Calcareous Tufa (CaCO3)

Jasper River Pebble (Silicon Dioxide (SiO2)) — sedimentary (microcrystalline quartz)

Jasper River Pebble

Silicon Dioxide (SiO2)

sedimentary (microcrystalline quartz)

Quartz-rich granite or pegmatitic rock (Granite/pegmatite; chiefly quartz (SiO₂), feldspar, and minor mica) — igneous

Quartz-rich granite or pegmatitic rock

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

Copper Ore with Malachite and Chalcocite (Copper-bearing Mineral Assemblage (Cu2CO3(OH)2 + Cu2S)) — mineral

Copper Ore with Malachite and Chalcocite

Copper-bearing Mineral Assemblage (Cu2CO3(OH)2 + Cu2S)

Weathered granitic rock (Granite or granodiorite; mainly quartz, feldspar, and mica/amphibole) — igneous

Weathered granitic rock

Granite or granodiorite; mainly quartz, feldspar, and mica/amphibole

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Sandstone (Quartz-rich) (Arenite (SiO2 based)) — sedimentary

Sandstone (Quartz-rich)

Arenite (SiO2 based)

Rhyolitic Tuff (Breccia Type) (Rhyolitic Pyroclastic Rock (Mixed Silicates including Quartz, Feldspar, and Volcanic Glass)) — igneous

Rhyolitic Tuff (Breccia Type)

Rhyolitic Pyroclastic Rock (Mixed Silicates including Quartz, Feldspar, and Volcanic Glass)

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

Sandstone (Flagstone)

Arenite (composed primarily of SiO2)

Chert (Yellow Jasper) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Yellow Jasper)

Microcrystalline Quartz (SiO2)

Quartz with inclusions (Silicon Dioxide (SiO2)) — mineral

Quartz with inclusions

Silicon Dioxide (SiO2)