Rock Identifier

Category

Rock

Browse rock specimens identified by the Rock Identifier community.

Learn about Rock in the encyclopedia

Rock Gypsum

Coral Rock

Rock Salt

Asphalt Rock

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Cataclasite

Anorthosite

Peridotite

Gondite

Phosphorite

Epidosite

Peridotite (Ultramafic igneous rock) — igneous

Peridotite

Ultramafic igneous rock

Sandstone with Quartz Veins (Arenite (primarily SiO2 with Fe2O3 staining)) — sedimentary

Sandstone with Quartz Veins

Arenite (primarily SiO2 with Fe2O3 staining)

Basalt River Stone (Extrusive Igneous Rock) — igneous

Basalt River Stone

Extrusive Igneous Rock

Granite (Intrusive Igneous Rock) — igneous

Granite

Intrusive Igneous Rock

Quartz (Druzy) in host rock (SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)) — Mineral

Quartz (Druzy) in host rock

SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)

Pumice (Pumice (volcanic rock)) — Igneous

Pumice

Pumice (volcanic rock)

Granite (Felsic intrusive igneous rock) — igneous

Granite

Felsic intrusive igneous rock

Banded Agate (Polished Slice) (Chalcedony (cryptocrystalline Quartz), SiO2) — mineral

Banded Agate (Polished Slice)

Chalcedony (cryptocrystalline Quartz), SiO2

Andesite Porphyry (Andesite (extrusive volcanic rock)) — igneous

Andesite Porphyry

Andesite (extrusive volcanic rock)

Quartz (on matrix) (Quartz (Silicon Dioxide, SiO₂)) — Mineral

Quartz (on matrix)

Quartz (Silicon Dioxide, SiO₂)

Porphyritic Igneous Rock / Basalt or Andesite Xenolith in Granite or Quartzite (Silicate rock with contrasting xenolith/inclusion) — igneous

Porphyritic Igneous Rock / Basalt or Andesite Xenolith in Granite or Quartzite

Silicate rock with contrasting xenolith/inclusion

River Rock (Quartzite/Chert) (Quartzite (primarily SiO2)) — metamorphic

River Rock (Quartzite/Chert)

Quartzite (primarily SiO2)

Vesicular Basalt (Basalt) — igneous

Vesicular Basalt

Basalt

Quartz Pebble (Iron-Stained) (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble (Iron-Stained)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous) (Arenite (SiO2 with iron oxide impurities)) — sedimentary

Sandstone (Ferruginous)

Arenite (SiO2 with iron oxide impurities)

River Rock (likely Siltstone or fine-grained Sandstone) (Clastic Sedimentary Rock) — sedimentary

River Rock (likely Siltstone or fine-grained Sandstone)

Clastic Sedimentary Rock

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Eroded Limestone with Iron Staining (Carbonate Rock (CaCO3)) — sedimentary

Eroded Limestone with Iron Staining

Carbonate Rock (CaCO3)

Shale (Argillaceous Sedimentary Rock) — sedimentary

Shale

Argillaceous Sedimentary Rock

Shale or Mudstone River Pebble (Argillaceous sedimentary rock) — sedimentary

Shale or Mudstone River Pebble

Argillaceous sedimentary rock

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

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

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Quartz-rich mineral fragment (Quartz (silicon dioxide, SiO₂), possibly milky quartz) — mineral

Quartz-rich mineral fragment

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Sandstone with Quartz Vein (Arenite with SiO2 intrusion) — sedimentary

Sandstone with Quartz Vein

Arenite with SiO2 intrusion

Sandstone (Arenite (SiO2 principal)) — sedimentary

Sandstone

Arenite (SiO2 principal)

Ferruginous Sandstone (Ironstone Nodules) (Ferruginous Quartz-Arenite (with Goethite/Hematite cement)) — sedimentary

Ferruginous Sandstone (Ironstone Nodules)

Ferruginous Quartz-Arenite (with Goethite/Hematite cement)

Granite (Granite) — Igneous

Granite

Granite

Basalt (Basalt) — igneous

Basalt

Basalt

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Basalt (Extrusive igneous rock) — igneous

Basalt

Extrusive igneous rock

River Pebble (Weathered Rock Fragment) — sedimentary

River Pebble

Weathered Rock Fragment

Foliated Metamorphic Rock (likely Gneiss or Schist) (Gneissic Metamorphic Rock) — metamorphic

Foliated Metamorphic Rock (likely Gneiss or Schist)

Gneissic Metamorphic Rock

Note: Item is not a geological specimen (n/a) — none

Note: Item is not a geological specimen

n/a

Limestone (Calcite rock (CaCO3)) — sedimentary

Limestone

Calcite rock (CaCO3)

Sedimentary Sandstone (Arenite (Sedimentary Rock)) — sedimentary

Sedimentary Sandstone

Arenite (Sedimentary Rock)

Sandstone (likely Arkosic) (Clastic Sedimentary Rock) — sedimentary

Sandstone (likely Arkosic)

Clastic Sedimentary Rock

Shale or Siltstone (Sedimentary Rock (Siliciclastic)) — sedimentary

Shale or Siltstone

Sedimentary Rock (Siliciclastic)

Pink Granite (Plagioclase-Quartz-K-Feldspar Granite) — igneous

Pink Granite

Plagioclase-Quartz-K-Feldspar Granite

Basalt Pebble (Extrusive Igneous Rock) — igneous

Basalt Pebble

Extrusive Igneous Rock

Quartz geode slice (Quartz (SiO₂), likely chalcedony-lined geode with drusy quartz) — mineral

Quartz geode slice

Quartz (SiO₂), likely chalcedony-lined geode with drusy quartz

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

Agate

SiO2 (Silicon Dioxide) - Chalcedony

Sandstone (Arenite (SiO2 based typically)) — sedimentary

Sandstone

Arenite (SiO2 based typically)