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

Chert (Common Opal variant) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Common Opal variant)

Microcrystalline Quartz (SiO2)

Sandstone (Ferruginous) (Arenite (with Iron Oxide cement)) — sedimentary

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

Sandstone (likely Quartzose Sandstone) (Arenite (primarily SiO2)) — sedimentary

Sandstone (likely Quartzose Sandstone)

Arenite (primarily SiO2)

Tiger's Eye (with Blue Tiger's Eye / Hawk's Eye) (Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)) — metamorphic

Tiger's Eye (with Blue Tiger's Eye / Hawk's Eye)

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)

Jasper (Silicon dioxide (SiO2)) — sedimentary

Jasper

Silicon dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (Ferruginous) (Arenite (primarily SiO2 with Fe2O3 staining)) — sedimentary

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Jasper (Silicon dioxide (SiO2) with iron impurities) — sedimentary

Jasper

Silicon dioxide (SiO2) with iron impurities

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Sandstone (Arenite (primary component SiO2)) — sedimentary

Sandstone

Arenite (primary component SiO2)

Geode (Unopened) (Silicon Dioxide (SiO2) in sedimentary host rock) — sedimentary

Geode (Unopened)

Silicon Dioxide (SiO2) in sedimentary host rock

River Stone (Granitic Gneiss) (Foliated Granitic Gneiss) — metamorphic

River Stone (Granitic Gneiss)

Foliated Granitic Gneiss

Pink Granite Cobble (Phaneritic Felsic Plutonic Rock (Granite)) — igneous

Pink Granite Cobble

Phaneritic Felsic Plutonic Rock (Granite)

Tiger's Eye (Silicon dioxide (SiO2) - Pseudomorph after crocidolite) — mineral

Tiger's Eye

Silicon dioxide (SiO2) - Pseudomorph after crocidolite

Dendritic Agate (Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions) — mineral

Dendritic Agate

Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions

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

Jasper

Silicon Dioxide (SiO2) with impurities

Quartz pebble with surface markings (Silicon Dioxide (SiO2)) — mineral

Quartz pebble with surface markings

Silicon Dioxide (SiO2)

Moqui Marble (Iron Oxide Concretion) (Iron Oxide Concretion (primarily Limonite/Hematite around a Sandstone center)) — sedimentary

Moqui Marble (Iron Oxide Concretion)

Iron Oxide Concretion (primarily Limonite/Hematite around a Sandstone center)

Shale (Laminated Mudstone) — sedimentary

Shale

Laminated Mudstone

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Yellow Jasper (Silicon Dioxide (SiO2)) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2)

Sandstone (Arenite (Silicon Dioxide, SiO2 based)) — sedimentary

Sandstone

Arenite (Silicon Dioxide, SiO2 based)

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

Chalcedony (Common Agate)

Silicon Dioxide (SiO2)

Red Sandstone (Arenite (primarily SiO2 with Fe2O3)) — sedimentary

Red Sandstone

Arenite (primarily SiO2 with Fe2O3)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Fossilized Brachiopod (Brachiopoda (e.g., Rhynchonellida or Spiriferida)) — sedimentary

Fossilized Brachiopod

Brachiopoda (e.g., Rhynchonellida or Spiriferida)

Sandstone (River Cobble) (Clastic Sedimentary Rock (primarily Quartz with Feldspar)) — sedimentary

Sandstone (River Cobble)

Clastic Sedimentary Rock (primarily Quartz with Feldspar)

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Quartz / Common Agate (Silicon Dioxide (SiO2)) — mineral

Quartz / Common Agate

Silicon Dioxide (SiO2)

Sandstone with Desert Varnish (Arenite with Ferromanganese patina) — sedimentary

Sandstone with Desert Varnish

Arenite with Ferromanganese patina

Sandstone (Arenite (SiO2 principal)) — sedimentary

Sandstone

Arenite (SiO2 principal)

Banded Jasper (Silicon Dioxide (SiO2) with impurities) — sedimentary

Banded Jasper

Silicon Dioxide (SiO2) with impurities

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

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Granodiorite (River Pebble) (Granodiorite) — igneous

Granodiorite (River Pebble)

Granodiorite

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Scoria (Red Lava Rock) (Scoria) — igneous

Scoria (Red Lava Rock)

Scoria

Granite (Plutonic Igneous Rock (composed typically of SiO2, Al2O3, K2O, Na2O, CaO)) — igneous

Granite

Plutonic Igneous Rock (composed typically of SiO2, Al2O3, K2O, Na2O, CaO)

Gneiss (Gneiss (foliated metamorphic rock)) — metamorphic

Gneiss

Gneiss (foliated metamorphic rock)

Ventifact (Wind-abraded rock (Ventifact)) — sedimentary

Ventifact

Wind-abraded rock (Ventifact)

Red Sandstone (Arenite (with iron oxide cement)) — sedimentary

Red Sandstone

Arenite (with iron oxide cement)

Painted Sandstone Cobble (Clastic Sedimentary Rock (Sandstone base)) — sedimentary

Painted Sandstone Cobble

Clastic Sedimentary Rock (Sandstone base)

Granite (Felsic intrusive igneous rock) — igneous

Granite

Felsic intrusive igneous rock