Rock Identifier

Community gallery

All rocks & minerals

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

Sandstone/Quartzite (Sedimentary Rock (composed mainly of SiO2)) — sedimentary

Sandstone/Quartzite

Sedimentary Rock (composed mainly of SiO2)

sedimentary
Gray Chert (Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Gray Chert (Flint)

Microcrystalline Quartz (SiO2)

sedimentary
Silicon (Element Si) — mineral

Silicon

Element Si

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

Chert (Flint)

Cryptocrystalline Quartz (SiO2)

sedimentary
Lapis Lazuli (Lazurite-dominant metamorphic rock, Na8[Al6Si6O24]n(S,Cl,SO4,OH)2) — metamorphic

Lapis Lazuli

Lazurite-dominant metamorphic rock, Na8[Al6Si6O24]n(S,Cl,SO4,OH)2

metamorphic
Green Moss Agate (Silicon Dioxide (SiO2) with Mineral Inclusions) — sedimentary

Green Moss Agate

Silicon Dioxide (SiO2) with Mineral Inclusions

sedimentary
Chert (Nodule) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (Nodule)

Microcrystalline quartz (SiO2)

sedimentary
Limestone with Calcite Veining (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone with Calcite Veining

Sedimentary Calcium Carbonate (CaCO3)

sedimentary
Banded Siltstone (Siltstone (primarily SiO2 with Al2O3)) — sedimentary

Banded Siltstone

Siltstone (primarily SiO2 with Al2O3)

sedimentary
Lake Superior Agate (Chalcedony (cryptocrystalline Quartz, SiO2) with iron oxide inclusions) — mineral

Lake Superior Agate

Chalcedony (cryptocrystalline Quartz, SiO2) with iron oxide inclusions

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

Milky Quartz Pebble

Silicon Dioxide (SiO2)

mineral
Chert (often colloquially called Flint) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (often colloquially called Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

sedimentary
Marble (Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)) — metamorphic

Marble

Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)

metamorphic
Brachiopod Fossil (Phylum Brachiopoda (replaced by Calcite or Silica)) — sedimentary

Brachiopod Fossil

Phylum Brachiopoda (replaced by Calcite or Silica)

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

Milky Quartz

Silicon Dioxide (SiO2)

mineral
Quartzite (Quartzite (principally SiO2)) — metamorphic

Quartzite

Quartzite (principally SiO2)

metamorphic
Fossilized Shark Tooth (Carcharocles sp. or similar (Fossilized Fluorapatite)) — sedimentary

Fossilized Shark Tooth

Carcharocles sp. or similar (Fossilized Fluorapatite)

sedimentary
Fossil Shark Tooth (Selachimorpha (Chondrichthyes dental fossil)) — sedimentary

Fossil Shark Tooth

Selachimorpha (Chondrichthyes dental fossil)

sedimentary
Fossilized Shark Tooth (Fossilized elasmobranch tooth (Apatite/Calcium Phosphate)) — sedimentary

Fossilized Shark Tooth

Fossilized elasmobranch tooth (Apatite/Calcium Phosphate)

sedimentary
Quartzite Cobble (Quartzite (SiO2)) — metamorphic

Quartzite Cobble

Quartzite (SiO2)

metamorphic
Limestone (Tufa/Travertine) (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone (Tufa/Travertine)

Sedimentary Calcium Carbonate (CaCO3)

sedimentary
Pumice (Pumice (volcanic glass)) — igneous

Pumice

Pumice (volcanic glass)

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

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (SiO2 dominated)

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

Milky Quartz

Silicon Dioxide (SiO2)

mineral
Chert (Basanite / Jasperoid) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Basanite / Jasperoid)

Microcrystalline Quartz (SiO2)

sedimentary
Green Aventurine (Silicon Dioxide (Quartz with Fuchsite inclusions) - SiO2) — mineral

Green Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions) - SiO2

mineral
Blue Slag Glass (Anthropogenic Amorphous Silicon Dioxide) — mineral

Blue Slag Glass

Anthropogenic Amorphous Silicon Dioxide

mineral
Clear Quartz (Rock Crystal) (Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

mineral
Stromatolite (Laminated biogenic sedimentary structure (Cyanobacteria)) — sedimentary

Stromatolite

Laminated biogenic sedimentary structure (Cyanobacteria)

sedimentary
Banded Calcite (Calcium Carbonate (CaCO3)) — mineral

Banded Calcite

Calcium Carbonate (CaCO3)

mineral
Blue Quartzite (Metamorphosed Quartz (SiO2) with inclusions) — metamorphic

Blue Quartzite

Metamorphosed Quartz (SiO2) with inclusions

metamorphic
Blue Glass or Slag Glass (Amorphous Silica (Anthropogenic Glass)) — mineral

Blue Glass or Slag Glass

Amorphous Silica (Anthropogenic Glass)

mineral
Chalcopyrite (Chalcopyrite (CuFeS2)) — mineral

Chalcopyrite

Chalcopyrite (CuFeS2)

mineral
Ocean Jasper (Orbicular Jasper) (Silicon Dioxide (SiO2) with various inclusions) — mineral

Ocean Jasper (Orbicular Jasper)

Silicon Dioxide (SiO2) with various inclusions

mineral
Slag Glass (Amorphous Silicate (Man-made)) — industrial byproduct

Slag Glass

Amorphous Silicate (Man-made)

industrial byproduct
Quartz with Iron Staining (Silicon Dioxide (SiO2)) — mineral

Quartz with Iron Staining

Silicon Dioxide (SiO2)

mineral
Quartz (Smoky/Milky) (Silicon Dioxide (SiO2)) — mineral

Quartz (Smoky/Milky)

Silicon Dioxide (SiO2)

mineral
Almandine Garnet in Matrix (Almandine Garnet (Fe3Al2(SiO4)3)) — metamorphic

Almandine Garnet in Matrix

Almandine Garnet (Fe3Al2(SiO4)3)

metamorphic
Citrine Quartz (Silicon Dioxide (SiO2) with iron impurities) — mineral

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

mineral
Mica Schist with Quartz (Muscovite/Biotite Schist) — metamorphic

Mica Schist with Quartz

Muscovite/Biotite Schist

metamorphic
Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

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

Milky Quartz

Silicon Dioxide (SiO2)

mineral