Rock Identifier

Category

Rock

Browse rock specimens identified by the Rock Identifier community.

Learn about Rock in the encyclopedia

Rock Gypsum

Coral Rock

Asphalt Rock

Rock Salt

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Anorthosite

Cataclasite

Peridotite

Phosphorite

Gondite

Dunite

Beach Pebble (Gabbro or Basalt Porphyry) (Mafic Igneous Rock (Porphyritic Basalt / Gabbro)) — igneous

Beach Pebble (Gabbro or Basalt Porphyry)

Mafic Igneous Rock (Porphyritic Basalt / Gabbro)

River Cobble / Basalt Pebble (Basalt (Mafic Extrusive Igneous Rock)) — igneous

River Cobble / Basalt Pebble

Basalt (Mafic Extrusive Igneous Rock)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone Pebble (Quartz Arenite / Sandstone) — sedimentary

Sandstone Pebble

Quartz Arenite / Sandstone

Chert (Pebble) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Pebble)

Microcrystalline Quartz (SiO2)

Sandstone (Sandstone (SiO2 dominated)) — sedimentary

Sandstone

Sandstone (SiO2 dominated)

Sandstone (Arenite (primarily Quartz and Feldspar composition)) — sedimentary

Sandstone

Arenite (primarily Quartz and Feldspar composition)

River Pebble (Siltstone/Mudstone) (Siltstone) — sedimentary

River Pebble (Siltstone/Mudstone)

Siltstone

Banded Gneiss (Gneiss (SiO2 enriched metamorphic rock)) — metamorphic

Banded Gneiss

Gneiss (SiO2 enriched metamorphic rock)

Quartzite (Quartzite (SiO2 composition)) — metamorphic

Quartzite

Quartzite (SiO2 composition)

Granite Pebble (Granite (plutonic felsic intrusive rock)) — igneous

Granite Pebble

Granite (plutonic felsic intrusive rock)

Scoria (Vesicular Basalt / Scoria) — igneous

Scoria

Vesicular Basalt / Scoria

Yellow Quartzite River Pebbles (Metamorphic Silicon Dioxide (SiO2) with iron oxide inclusions) — metamorphic

Yellow Quartzite River Pebbles

Metamorphic Silicon Dioxide (SiO2) with iron oxide inclusions

Sandstone (Arenite (SiO2 based with mineral cements)) — sedimentary

Sandstone

Arenite (SiO2 based with mineral cements)

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

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

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

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Yellow Quartzite (River Pebble) (Quartzite (primarily SiO2)) — metamorphic

Yellow Quartzite (River Pebble)

Quartzite (primarily SiO2)

Sandstone (with Calcite or Silica veins) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (with Calcite or Silica veins)

Clastic sedimentary rock (primarily SiO2)

Quartzite River Stone (Quartzite (SiO2)) — metamorphic

Quartzite River Stone

Quartzite (SiO2)

Chalcedony (Common Opal variant or Agate pebble) (Silicon dioxide (SiO2)) — mineral

Chalcedony (Common Opal variant or Agate pebble)

Silicon dioxide (SiO2)

Brachiopod Fossil (Phylum Brachiopoda) — fossil

Brachiopod Fossil

Phylum Brachiopoda

Quartzite Pebble (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite Pebble

Metamorphic Quartzite (SiO2)

Red and Yellow Jasper (Silicon Dioxide (SiO2)) — sedimentary

Red and Yellow Jasper

Silicon Dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Chert (Sea-worn Pebble) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Sea-worn Pebble)

Microcrystalline Quartz (SiO2)

Sandstone (Arenite (specifically Quartz Arenite)) — sedimentary

Sandstone

Arenite (specifically Quartz Arenite)

Sandstone (Arenite (primarily Quartz-based)) — sedimentary

Sandstone

Arenite (primarily Quartz-based)

Limonite Sandstone (Ferruginous Sandstone (Hydrated Iron Oxide)) — sedimentary

Limonite Sandstone

Ferruginous Sandstone (Hydrated Iron Oxide)

Sandstone (Arenite (clastic sedimentary rock)) — sedimentary

Sandstone

Arenite (clastic sedimentary rock)

Banded Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Banded Chert

Microcrystalline Quartz (SiO2)

Rose Quartz (Silicon Dioxide (SiO2) with Trace Inclusions) — mineral

Rose Quartz

Silicon Dioxide (SiO2) with Trace Inclusions

Quartz Geode (Crystalline Silver Oxide (SiO2) in Calcareous Host) — mineral

Quartz Geode

Crystalline Silver Oxide (SiO2) in Calcareous Host

Sandstone (Arenite (Sandstone)) — sedimentary

Sandstone

Arenite (Sandstone)

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

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Arenite (primarily Quartz Arenite)) — sedimentary

Sandstone

Arenite (primarily Quartz Arenite)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Snowflake Obsidian (Vitreous Silica with Spherulite inclusions (Amorphous SiO2)) — igneous

Snowflake Obsidian

Vitreous Silica with Spherulite inclusions (Amorphous SiO2)

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

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Picture Sandstone) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Picture Sandstone)

Arenite (primarily SiO2)

Snowflake Obsidian (Obsidian with Cristobalite inclusions (70–75% SiO2)) — igneous

Snowflake Obsidian

Obsidian with Cristobalite inclusions (70–75% SiO2)

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

Yellow Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Jasper (likely Iron-stained) (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Jasper (likely Iron-stained)

Silicon Dioxide (SiO2) with iron oxide inclusions