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

Ruby in Kyanite (Al2O3 (Corundum) in Al2SiO5 (Kyanite-Fuchsite-Quartz)) — metamorphic

Ruby in Kyanite

Al2O3 (Corundum) in Al2SiO5 (Kyanite-Fuchsite-Quartz)

Red Jasper (Polished) (Silicon Dioxide (SiO2) with Hematite inclusions) — sedimentary

Red Jasper (Polished)

Silicon Dioxide (SiO2) with Hematite inclusions

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

Sandstone (Ferruginous)

Ferruginous Sandstone (SiO2 with Fe2O3/FeO(OH) cement)

Note regarding image quality — Indeterminate

Note regarding image quality

Banded Calcite (often sold as 'Travertine' or 'Mexican Onyx') (Calcium Carbonate (CaCO3)) — sedimentary

Banded Calcite (often sold as 'Travertine' or 'Mexican Onyx')

Calcium Carbonate (CaCO3)

Chert (Chert / Flint) (Silicon dioxide (SiO2) - Microcrystalline quartz) — sedimentary

Chert (Chert / Flint)

Silicon dioxide (SiO2) - Microcrystalline quartz

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Greenstone (Metabasalt (Greenstone Facies)) — metamorphic

Greenstone

Metabasalt (Greenstone Facies)

Vesicular basalt (scoria-like lava rock) (Vesicular basalt; chiefly plagioclase, pyroxene, olivine, and volcanic glass) — igneous

Vesicular basalt (scoria-like lava rock)

Vesicular basalt; chiefly plagioclase, pyroxene, olivine, and volcanic glass

Chert (Jasper variety) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Orbicular jasper / brecciated jasper (Silica-rich microcrystalline quartz (chalcedony), commonly with iron oxides and altered volcanic fragments) — metamorphic

Orbicular jasper / brecciated jasper

Silica-rich microcrystalline quartz (chalcedony), commonly with iron oxides and altered volcanic fragments

Green Andesite (or Greenstone / Altered Volcanic Rock) (Intermediate Volcanic Rock with Chlorite/Epidote Alteration) — igneous

Green Andesite (or Greenstone / Altered Volcanic Rock)

Intermediate Volcanic Rock with Chlorite/Epidote Alteration

Basalt (Basalt) — igneous

Basalt

Basalt

Chert Cobble / Quartzite River Stone (Microcrystalline Quartz (SiO2) / Quartzite) — sedimentary

Chert Cobble / Quartzite River Stone

Microcrystalline Quartz (SiO2) / Quartzite

Petrified Wood (Silicified Wood (primarily SiO2)) — sedimentary

Petrified Wood

Silicified Wood (primarily SiO2)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Ironstone Concretion / Goethite-Hematite Geode (Goethite / Hematite Concretion (Fe3O4 / FeO(OH) / Fe2O3)) — sedimentary

Ironstone Concretion / Goethite-Hematite Geode

Goethite / Hematite Concretion (Fe3O4 / FeO(OH) / Fe2O3)

Serpentinite (Serpentinite (composed mainly of Serpentine-group minerals: (Mg, Fe)3Si2O5(OH)4)) — metamorphic

Serpentinite

Serpentinite (composed mainly of Serpentine-group minerals: (Mg, Fe)3Si2O5(OH)4)

Yellow Quartzite (Quartzite (SiO2)) — metamorphic

Yellow Quartzite

Quartzite (SiO2)

Sandstone (Ferruginous) (Arenite (with Iron Oxide cement)) — sedimentary

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

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

Sandstone

Arenite (composed primarily of SiO2)

Red Sandstone (Iron-rich Sandstone) (Clastic Sedimentary Rock - Quartz Arenite / Arkose with Hematite Cement) — sedimentary

Red Sandstone (Iron-rich Sandstone)

Clastic Sedimentary Rock - Quartz Arenite / Arkose with Hematite Cement

Weathered granite or granitic gneiss (Quartz–feldspar–mica granitoid; possibly gneiss if the visible layering is tectonic) — igneous

Weathered granite or granitic gneiss

Quartz–feldspar–mica granitoid; possibly gneiss if the visible layering is tectonic

Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Chert

Microcrystalline Quartz (SiO2)

Basalt (Basalt (Aphanitic Mafic Igneous Rock)) — igneous

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Polished brecciated jasper (Silicified breccia, chiefly microcrystalline quartz (SiO₂) with iron-oxide staining) — mineral

Polished brecciated jasper

Silicified breccia, chiefly microcrystalline quartz (SiO₂) with iron-oxide staining

Chert (Jasper variety) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Jasper variety)

Silicon Dioxide (SiO2)

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

Chert (Yellow Jasper)

Microcrystalline Quartz (SiO2)

Granite (Phaneritic Plutonic Felsic Rock (SiO2 > 69%)) — igneous

Granite

Phaneritic Plutonic Felsic Rock (SiO2 > 69%)

Granite (Granite (Phaneritic igneous rock composed primarily of Quartz and Feldspar)) — igneous

Granite

Granite (Phaneritic igneous rock composed primarily of Quartz and Feldspar)

Sandstone (Red Sandstone / River Stone) (Arenite (composed primarily of Quartz, SiO2, with Iron Oxide cementation)) — sedimentary

Sandstone (Red Sandstone / River Stone)

Arenite (composed primarily of Quartz, SiO2, with Iron Oxide cementation)

Siltstone with Quartz Vein (Siltstone (composed of Quartz and Clay minerals) with a hydrothermal Quartz vein (SiO2)) — sedimentary

Siltstone with Quartz Vein

Siltstone (composed of Quartz and Clay minerals) with a hydrothermal Quartz vein (SiO2)

Chert (Flint) (Microcrystalline Silicon Dioxide (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline Silicon Dioxide (SiO2)

Gravel (Crushed Stone Aggregates) (Mixed Siliciclastic / Carbonate Aggregate) — sedimentary

Gravel (Crushed Stone Aggregates)

Mixed Siliciclastic / Carbonate Aggregate

Chert (containing Quartz) (Microcrystalline Silica (SiO2)) — sedimentary

Chert (containing Quartz)

Microcrystalline Silica (SiO2)

Mica Schist (Mica Schist (predominantly Muscovite/Biotite)) — metamorphic

Mica Schist

Mica Schist (predominantly Muscovite/Biotite)

Mica Schist (Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3(AlSi3O10)(OH)2)) — metamorphic

Mica Schist

Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3(AlSi3O10)(OH)2)

Quartz (Iron-stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

River Pebble (Basalt) (Basalt (Aphanitic Mafic Igneous Rock)) — igneous

River Pebble (Basalt)

Basalt (Aphanitic Mafic Igneous Rock)

Jasper and Chert Conglomerate (Ferruginous Microcrystalline Quartz (SiO2)) — sedimentary

Jasper and Chert Conglomerate

Ferruginous Microcrystalline Quartz (SiO2)

Diorite (or Gabbro/Gneiss stream pebble) (Diorite) — igneous

Diorite (or Gabbro/Gneiss stream pebble)

Diorite