Rock Identifier

Category

Organic Materia (Not A Rock Or Mineral)

Browse organic materia (not a rock or mineral) specimens identified by the Rock Identifier community.

Learn about Organic Materia (Not A Rock Or Mineral) in the encyclopedia

Rock Salt

Rock Gypsum

Coral Rock

Asphalt Rock

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Emerald in Matrix

Emerald in Matrix

Aquamarine Matrix

Aquamarine Matrix

Sapropel

Halite

Black Shale

Bituminous Shale

Bituminous Shale

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Sandstone (likely River-tumbled Picture Sandstone) (Arenite (predominantly SiO2 with iron oxide impurities)) — sedimentary

Sandstone (likely River-tumbled Picture Sandstone)

Arenite (predominantly SiO2 with iron oxide impurities)

Pyrite in Matrix (Iron Disulfide (FeS2)) — mineral

Pyrite in Matrix

Iron Disulfide (FeS2)

Agate Geode (Silicon Dioxide (Chalcedony/Quartz), SiO2) — sedimentary

Agate Geode

Silicon Dioxide (Chalcedony/Quartz), SiO2

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

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (Clastic Sedimentary Rock) — sedimentary

Sandstone

Clastic Sedimentary Rock

Granite Boulder (Intrusive Igneous Rock) — igneous

Granite Boulder

Intrusive Igneous Rock

Dark gray basalt or andesite cobble (Fine-grained mafic to intermediate volcanic rock; commonly plagioclase feldspar, pyroxene, and possibly olivine) — igneous

Dark gray basalt or andesite cobble

Fine-grained mafic to intermediate volcanic rock; commonly plagioclase feldspar, pyroxene, and possibly olivine

Pearl (Calcium carbonate (Aragonite/Calcite) - CaCO3) — gemstone

Pearl

Calcium carbonate (Aragonite/Calcite) - CaCO3

Sandstone (likely Arkosic or Lithic Sandstone) (Arenite (SiO2 based with mineral inclusions)) — sedimentary

Sandstone (likely Arkosic or Lithic Sandstone)

Arenite (SiO2 based with mineral inclusions)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Flint (Chert) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Flint (Chert)

Cryptocrystalline Quartz (SiO2)

Yellow Jasper (Chert) (Silicon Dioxide (SiO2) with iron inclusions) — sedimentary

Yellow Jasper (Chert)

Silicon Dioxide (SiO2) with iron inclusions

Schist (Schist) — metamorphic

Schist

Schist

Quartz-Veined Mudstone (Argillaceous Mudstone with Quartz Veining) — sedimentary

Quartz-Veined Mudstone

Argillaceous Mudstone with Quartz Veining

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Unidentified Rock Fragment (Unknown) — Rock

Unidentified Rock Fragment

Unknown

Granodiorite (Granodiorite) — igneous

Granodiorite

Granodiorite

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Granite (Intrusive Igneous Rock) — igneous

Granite

Intrusive Igneous Rock

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Chalcedony / Quartz Nodule (Agate Pebble) (Silicon Dioxide (SiO2)) — mineral

Chalcedony / Quartz Nodule (Agate Pebble)

Silicon Dioxide (SiO2)

Jasper (Silicon Dioxide (Quartz variety, SiO2)) — mineral

Jasper

Silicon Dioxide (Quartz variety, SiO2)

Chalcedony (Yellow Agate / Carnelian Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Yellow Agate / Carnelian Chalcedony)

Silicon Dioxide (SiO2)

Yellow Quartz / Chalcedony Pebble (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz / Chalcedony Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Crystalline Silica (SiO2)) — mineral

Quartz Pebble

Crystalline Silica (SiO2)

Quartz (Smoky/Clear variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Smoky/Clear variety)

Silicon Dioxide (SiO2)

Quartz (Variety: Rock Crystal Cluster) (Silicon Dioxide (SiO2)) — mineral

Quartz (Variety: Rock Crystal Cluster)

Silicon Dioxide (SiO2)

Quartz Crystal Point (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal Point

Silicon Dioxide (SiO2)

Lapis Lazuli (Tumbled Stone) (Na6Ca2(Al6Si6O24)(SO4,S,Cl)2 (Lazulite-rich Metamorphic Rock)) — metamorphic

Lapis Lazuli (Tumbled Stone)

Na6Ca2(Al6Si6O24)(SO4,S,Cl)2 (Lazulite-rich Metamorphic Rock)

Pet Rock (Quartzite/Sandstone River Rock) (Silicon Dioxide (SiO2) mixture) — sedimentary

Pet Rock (Quartzite/Sandstone River Rock)

Silicon Dioxide (SiO2) mixture

Granite (Intrusive Igneous Rock) — igneous

Granite

Intrusive Igneous Rock

Sandstone (likely Arkosic or Ferruginous) (Arenite (SiO2 with iron oxides or feldspar)) — sedimentary

Sandstone (likely Arkosic or Ferruginous)

Arenite (SiO2 with iron oxides or feldspar)

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

Sandstone

Arenite (composed primarily of SiO2)

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

Sandstone (Quartzose)

Arenite (primarily SiO2)

Jasper and Quartz Breccia (Silicified Breccia / Microcrystalline Quartz with Iron Oxide) — sedimentary

Jasper and Quartz Breccia

Silicified Breccia / Microcrystalline Quartz with Iron Oxide

Gneiss (Foliated Metamorphic Rock) — metamorphic

Gneiss

Foliated Metamorphic Rock

Argillite / Mudstone (Argillaceous sedimentary rock) — sedimentary

Argillite / Mudstone

Argillaceous sedimentary rock

Granite (Intrusive Igneous Rock) — igneous

Granite

Intrusive Igneous Rock

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

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Quartz Pebbles (Silicon Dioxide (SiO2)) — mineral

Quartz Pebbles

Silicon Dioxide (SiO2)