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

Raw Agate (Rough Lake Superior Agate or Jasper-Chalcedony Nodule) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — mineral

Raw Agate (Rough Lake Superior Agate or Jasper-Chalcedony Nodule)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Travertine / Tufa (Calcium Carbonate (CaCO3)) — sedimentary

Travertine / Tufa

Calcium Carbonate (CaCO3)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone (Limonitic/Iron-stained) (Sandstone (containing Quartz, SiO2, and Limonite, FeO(OH)·nH2O)) — sedimentary

Sandstone (Limonitic/Iron-stained)

Sandstone (containing Quartz, SiO2, and Limonite, FeO(OH)·nH2O)

Desert Rose (Gypsum Rose) (Gypsum (CaSO4·2H2O) with inclusions of sand) — mineral

Desert Rose (Gypsum Rose)

Gypsum (CaSO4·2H2O) with inclusions of sand

Quartz with Epidote / Serpentine (Vein Quartz) (SiO2 (Quartz) with Ca2(Al,Fe)3(SiO4)3(OH) (Epidote)) — metamorphic

Quartz with Epidote / Serpentine (Vein Quartz)

SiO2 (Quartz) with Ca2(Al,Fe)3(SiO4)3(OH) (Epidote)

Quartz (Chert / Agate / Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Quartz (Chert / Agate / Chalcedony)

Silicon Dioxide (SiO2)

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

Quartz Pebble (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz Pebble (Citrine or Iron-stained Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Milky Quartz Nodule / Geode precursor (Silicon Dioxide (SiO2)) — mineral

Milky Quartz Nodule / Geode precursor

Silicon Dioxide (SiO2)

Quartzite Cobble (Quartzite) — metamorphic

Quartzite Cobble

Quartzite

Quartz with Mica Schist (Quartz-Mica Schist / Pegmatitic Quartz) — metamorphic

Quartz with Mica Schist

Quartz-Mica Schist / Pegmatitic Quartz

Granite / Arkosic Sandstone (Coarse Igneous or Sedimentary Aggregate) (Granite / Quartz-Feldspar Aggregate) — igneous

Granite / Arkosic Sandstone (Coarse Igneous or Sedimentary Aggregate)

Granite / Quartz-Feldspar Aggregate

Polished Tumbled Stone (Dark Chalcedony / Jasper) (Silicon Dioxide (SiO2)) — mineral

Polished Tumbled Stone (Dark Chalcedony / Jasper)

Silicon Dioxide (SiO2)

Quartzite Pebble (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite Pebble

Metamorphic Quartzite (SiO2)

River Pebble (Quartzite / Chert) (Silicon Dioxide (SiO2)) — sedimentary

River Pebble (Quartzite / Chert)

Silicon Dioxide (SiO2)

Sandstone (with iron staining) (Quartz Arenite / Ferruginous Sandstone) — sedimentary

Sandstone (with iron staining)

Quartz Arenite / Ferruginous Sandstone

Red Sandstone Pebble (Sandstone (Quartzose/Feldspathic Sandstone)) — sedimentary

Red Sandstone Pebble

Sandstone (Quartzose/Feldspathic Sandstone)

Beach Pebble (Nephrite Jade / Chalcedony) (Ca2(Mg,Fe)5Si8O22(OH)2 / SiO2) — metamorphic

Beach Pebble (Nephrite Jade / Chalcedony)

Ca2(Mg,Fe)5Si8O22(OH)2 / SiO2

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

Red Jasper

Silicon Dioxide (SiO2 with Hematite inclusions)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Lake Superior Agate (Banded Chalcedony / Silicon Dioxide (SiO2)) — mineral

Lake Superior Agate

Banded Chalcedony / Silicon Dioxide (SiO2)

Amethyst (Silicon Dioxide (SiO2)) — mineral

Amethyst

Silicon Dioxide (SiO2)

Picture Jasper (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Picture Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Green Quartzite / Quartz Pebble (SiO2 (Silicon Dioxide with inclusions)) — metamorphic

Green Quartzite / Quartz Pebble

SiO2 (Silicon Dioxide with inclusions)

Spinifex Texture Komatiite (Komatiite (Ultramafic Volcanic Rock)) — igneous

Spinifex Texture Komatiite

Komatiite (Ultramafic Volcanic Rock)

Basalt Pebble (Extrusive mafic igneous rock) — igneous

Basalt Pebble

Extrusive mafic igneous rock

Tumbled Chalcedony (Quartz (Silicon Dioxide - SiO2)) — mineral

Tumbled Chalcedony

Quartz (Silicon Dioxide - SiO2)

Sandstone (Arenite (predominantly SiO2)) — sedimentary

Sandstone

Arenite (predominantly SiO2)

Red Jasper (Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

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

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Riverstone (likely Graywacke or Siltstone) (Sedimentary sandstone (Graywacke), SiO2 dominant) — sedimentary

Riverstone (likely Graywacke or Siltstone)

Sedimentary sandstone (Graywacke), SiO2 dominant

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Banded Jasper (Silicate Mineral (Microcrystalline Quartz / SiO2)) — sedimentary

Banded Jasper

Silicate Mineral (Microcrystalline Quartz / SiO2)

River Pebble (Quartz-rich) (Silicon Dioxide (SiO2) with impurities) — sedimentary

River Pebble (Quartz-rich)

Silicon Dioxide (SiO2) with impurities

Siltstone Pebble (Siltstone (composed of siliciclastic grains)) — sedimentary

Siltstone Pebble

Siltstone (composed of siliciclastic grains)

Sandstone (Arenite (SiO2 principal)) — sedimentary

Sandstone

Arenite (SiO2 principal)

Sandstone (Arenite (Siliclastic sedimentary rock)) — sedimentary

Sandstone

Arenite (Siliclastic sedimentary rock)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite