Rock Identifier

Community gallery

All rocks & minerals

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

Chalcedony (Silicon Dioxide (SiO2)) — mineral

Chalcedony

Silicon Dioxide (SiO2)

Vesticular Basalt (Vesicular Basalt) — igneous

Vesticular Basalt

Vesicular Basalt

Banded Chert (Silicon Dioxide (SiO2)) — sedimentary

Banded Chert

Silicon Dioxide (SiO2)

Pumice (Pumice (Felsic volcanic rock)) — igneous

Pumice

Pumice (Felsic volcanic rock)

Quartzite River Rock (Metaquartzite (majorly SiO2)) — metamorphic

Quartzite River Rock

Metaquartzite (majorly SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Quartz Geode Segment (Crystalline Silicon Dioxide (SiO2)) — mineral

Quartz Geode Segment

Crystalline Silicon Dioxide (SiO2)

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Obsidian (Volcanic Glass (SiO2)) — igneous

Obsidian

Volcanic Glass (SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Quartzite (River Pebble) (Metamorphosed Quartz Sandstone (SiO2)) — metamorphic

Quartzite (River Pebble)

Metamorphosed Quartz Sandstone (SiO2)

Red Jasper (Silicon Dioxide (SiO2) with iron oxide inclusions) — mineral

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Basalt (Basalt (Mafic Extrusive)) — igneous

Basalt

Basalt (Mafic Extrusive)

Banded Gneiss (Gneiss (Metamorphic rock composed of feldspar, quartz, and mica)) — metamorphic

Banded Gneiss

Gneiss (Metamorphic rock composed of feldspar, quartz, and mica)

Porphyritic Basalt (Chinese Writing Stone) (Porphyritic Basalt with Feldspar Phenocrysts) — igneous

Porphyritic Basalt (Chinese Writing Stone)

Porphyritic Basalt with Feldspar Phenocrysts

Adventurine (Green Quartz) (Silicon Dioxide (SiO2) with Fuchsite inclusions) — metamorphic

Adventurine (Green Quartz)

Silicon Dioxide (SiO2) with Fuchsite inclusions

Limestone (River Stone) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (River Stone)

Calcium Carbonate (CaCO3)

Granite (Granite) — igneous

Granite

Granite

Quartzite Cobble (Quartzite (SiO2)) — metamorphic

Quartzite Cobble

Quartzite (SiO2)

Almandine Garnet (Almandine, Fe3Al2(SiO4)3) — mineral

Almandine Garnet

Almandine, Fe3Al2(SiO4)3

Snowflake Obsidian (Obsidian with Cristobalite inclusions) — igneous

Snowflake Obsidian

Obsidian with Cristobalite inclusions

Dalmatian Jasper (Peralkaline rock with Tourmaline spots) — igneous

Dalmatian Jasper

Peralkaline rock with Tourmaline spots

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Sodalite (Sodalite (Na8Al6Si6O24Cl2)) — mineral

Sodalite

Sodalite (Na8Al6Si6O24Cl2)

Quartz Geode (Unbroken) (Silicon Dioxide (SiO2)) — sedimentary

Quartz Geode (Unbroken)

Silicon Dioxide (SiO2)

Chert (and Limestone) (Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3)) — sedimentary

Chert (and Limestone)

Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3)

Quartz (Milky or Druzy Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky or Druzy Quartz)

Silicon Dioxide (SiO2)

Granite Cobble (Phaneritic Felsic Igneous Rock) — igneous

Granite Cobble

Phaneritic Felsic Igneous Rock

Turquoise (Turquoise - CuAl6(PO4)4(OH)8·4H2O) — mineral

Turquoise

Turquoise - CuAl6(PO4)4(OH)8·4H2O

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

Granite River Rock

Phaneritic Felsic Igneous Rock (Granite)

Basalt (Basalt (composition primarily Plagioclase Feldspar and Pyroxene)) — igneous

Basalt

Basalt (composition primarily Plagioclase Feldspar and Pyroxene)

Pyrite (Fool's Gold) (Iron Disulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Siltstone (Siltstone (primarily composed of quartz and clay minerals)) — sedimentary

Siltstone

Siltstone (primarily composed of quartz and clay minerals)

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

Hematite

Iron(III) oxide (Fe2O3)

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Red Sandstone (Arenite (Ferruginous Sandstone)) — sedimentary

Red Sandstone

Arenite (Ferruginous Sandstone)

Red Sandstone (Arenite (primarily Quartz with Hematite cement)) — sedimentary

Red Sandstone

Arenite (primarily Quartz with Hematite cement)

Granite (Felsic Plutonic Rock (primarily Quartz, Potassium Feldspar, and Plagioclase)) — igneous

Granite

Felsic Plutonic Rock (primarily Quartz, Potassium Feldspar, and Plagioclase)

Coquina (Biogenic Limestone (Coquina)) — sedimentary

Coquina

Biogenic Limestone (Coquina)

Banded Calcite (often commercially called Mexican Onyx) (Calcite (Calcium Carbonate, CaCO3)) — mineral

Banded Calcite (often commercially called Mexican Onyx)

Calcite (Calcium Carbonate, CaCO3)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)