Rock Identifier

Community gallery

All rocks & minerals

Every specimen the Rock Identifier community has discovered, from desert agates to deep-sea basalts.

Chert (Flint Nodules) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Flint Nodules)

Cryptocrystalline Quartz (SiO2)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Chert (Flint) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Black Tourmaline (Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)) — mineral

Black Tourmaline

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

Chert (Field Stone) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Field Stone)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Beryl (Aquamarine variety) (Beryllium Aluminum Cyclosilicate (Be3Al2Si6O18)) — mineral

Beryl (Aquamarine variety)

Beryllium Aluminum Cyclosilicate (Be3Al2Si6O18)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Limestone (likely Tufa or Travertine) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (likely Tufa or Travertine)

Calcium Carbonate (CaCO3)

Red Jasper (Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)) — sedimentary

Red Jasper

Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)

Chert (Chalky Flint Node) (Chert (Microcrystalline Quartz, SiO2)) — sedimentary

Chert (Chalky Flint Node)

Chert (Microcrystalline Quartz, SiO2)

Geode (Calcite or Quartz) (Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)) — sedimentary

Geode (Calcite or Quartz)

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)

Red Sandstone (Arenite with iron oxide (Hematite) cement) — sedimentary

Red Sandstone

Arenite with iron oxide (Hematite) cement

Anthracite Coal (Anthracite) — metamorphic

Anthracite Coal

Anthracite

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

Petrified Wood

Silicified Wood (primarily SiO2)

Anthracite Coal with Sulfur staining (Anthracite (Carbon C with impurities)) — metamorphic

Anthracite Coal with Sulfur staining

Anthracite (Carbon C with impurities)

Quartz Vein in Host Rock (Quartz (SiO2) in metamorphic host rock (likely schist or phyllite)) — metamorphic

Quartz Vein in Host Rock

Quartz (SiO2) in metamorphic host rock (likely schist or phyllite)

Hematite (Concretion) (Iron(III) oxide (Fe2O3)) — mineral

Hematite (Concretion)

Iron(III) oxide (Fe2O3)

Petrified Wood (Silicified wood (primarily Quartz/Chalcedony, SiO2)) — mineral

Petrified Wood

Silicified wood (primarily Quartz/Chalcedony, SiO2)

Petrified Wood (Silicified Wood (primarily Quartz or Chalcedony, SiO2)) — mineral

Petrified Wood

Silicified Wood (primarily Quartz or Chalcedony, SiO2)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Blue Chalcedony (Agate) (Silicon Dioxide (SiO2)) — mineral

Blue Chalcedony (Agate)

Silicon Dioxide (SiO2)

Copper and Quartz beads (Native Copper (Cu) and Crystalline Quartz (SiO2)) — mineral

Copper and Quartz beads

Native Copper (Cu) and Crystalline Quartz (SiO2)

Black Onyx and Verdigris Copper Jewelry (Chalcedony (SiO2) with Copper Patina) — mineral

Black Onyx and Verdigris Copper Jewelry

Chalcedony (SiO2) with Copper Patina

White Howlite (Howlite (Calcium borosilicate hydroxide, Ca2B5SiO9(OH)5)) — mineral

White Howlite

Howlite (Calcium borosilicate hydroxide, Ca2B5SiO9(OH)5)

Moonstone (Orthoclase and Albite (KAlSi3O8 / NaAlSi3O8)) — mineral

Moonstone

Orthoclase and Albite (KAlSi3O8 / NaAlSi3O8)

Granite (Phaneritic Plutonic Felsic Rock (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8 + SiO2)) — igneous

Granite

Phaneritic Plutonic Felsic Rock (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8 + SiO2)

Red Granite (Phaneritic Felsic Igneous Rock (Granite)) — igneous

Red Granite

Phaneritic Felsic Igneous Rock (Granite)

Sandstone Cobble (Arenite (predominantly Quartz Sandstone)) — sedimentary

Sandstone Cobble

Arenite (predominantly Quartz Sandstone)

Sandstone (lithic) (Lithic Wacke / Arenite) — sedimentary

Sandstone (lithic)

Lithic Wacke / Arenite

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Limonite/Goethite nodule (Goethite (FeO(OH)) with Hydrated Iron Oxides) — mineral

Limonite/Goethite nodule

Goethite (FeO(OH)) with Hydrated Iron Oxides

Red Jasper with Quartz Veining (Silicon Dioxide (SiO2) with Hematite impurities) — sedimentary

Red Jasper with Quartz Veining

Silicon Dioxide (SiO2) with Hematite impurities

Coal (Anthracite or Bituminous) (Lithified plant matter (Carbon)) — sedimentary

Coal (Anthracite or Bituminous)

Lithified plant matter (Carbon)

Claystone Concretion (Septarian Concretion (Ironstone-rich)) — sedimentary

Claystone Concretion

Septarian Concretion (Ironstone-rich)

Quartz (Smoky Quartz variant) (Silicon Dioxide (SiO2)) — mineral

Quartz (Smoky Quartz variant)

Silicon Dioxide (SiO2)

Eroded Brick or Pumice-like Scoria (Vesicular Basalt / Scoria (Anthropogenic variant: Eroded Firebrick)) — igneous

Eroded Brick or Pumice-like Scoria

Vesicular Basalt / Scoria (Anthropogenic variant: Eroded Firebrick)

Chalcedony Pebble (Cryptocrystalline Quartz (SiO2)) — mineral

Chalcedony Pebble

Cryptocrystalline Quartz (SiO2)

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

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Fossil Coral (Petoskey-style Rugose Coral) (Hexagonaria percarinata (Order: Rugosa)) — sedimentary

Fossil Coral (Petoskey-style Rugose Coral)

Hexagonaria percarinata (Order: Rugosa)

Pumice (Pumice (Amorphous volcanic glass)) — Igneous

Pumice

Pumice (Amorphous volcanic glass)

Quartzite River Cobble (Quartzite (SiO2)) — metamorphic

Quartzite River Cobble

Quartzite (SiO2)

Granite (Phaneritic Igneous Rock (Granite)) — igneous

Granite

Phaneritic Igneous Rock (Granite)