Rock Identifier

Category

Organic (Non Rock)

Browse organic (non rock) specimens identified by the Rock Identifier community.

Learn about Organic (Non Rock) in the encyclopedia

Mudstone

Bituminous Shale

Bituminous Shale

Hornfels

Black Shale

Oil Shale

Argillite

Sapropel

Limestone (Weathered/Silicified) (Sedimentary carbonate rock (primarily CaCO3)) — sedimentary

Limestone (Weathered/Silicified)

Sedimentary carbonate rock (primarily CaCO3)

White Precious Opal (Hydrated Silica (SiO2·nH2O)) — mineral

White Precious Opal

Hydrated Silica (SiO2·nH2O)

Geode (Unopened) (Silica-rich concretion (SiO2)) — sedimentary

Geode (Unopened)

Silica-rich concretion (SiO2)

River Pebble (Granite/Sandstone Pebble) (Rounded Quartz/Feldspar Gravel Clast) — igneous

River Pebble (Granite/Sandstone Pebble)

Rounded Quartz/Feldspar Gravel Clast

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

Puddingstone (Conglomerate) (Conglomerate (clastic sedimentary rock)) — sedimentary

Puddingstone (Conglomerate)

Conglomerate (clastic sedimentary rock)

Weathered volcanic rock, likely basalt (Basalt; primarily plagioclase feldspar, pyroxene, and often olivine) — igneous

Weathered volcanic rock, likely basalt

Basalt; primarily plagioclase feldspar, pyroxene, and often olivine

Chert (Nodule) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (Nodule)

Microcrystalline quartz (SiO2)

Concrete rubble (Anthropogenic conglomerate) — sedimentary

Concrete rubble

Anthropogenic conglomerate

Fossilized bone fragment (Fossil bone, composed chiefly of carbonate-fluorapatite (bioapatite)) — fossil

Fossilized bone fragment

Fossil bone, composed chiefly of carbonate-fluorapatite (bioapatite)

Quartzite Cobble (Meta-quartzite) — metamorphic

Quartzite Cobble

Meta-quartzite

Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

Basalt River Pebble (Basalt (Mafic Volcanic Rock)) — igneous

Basalt River Pebble

Basalt (Mafic Volcanic Rock)

Petrified Wood (Silicified Wood (primarily Quartz/Chalcedony, SiO2)) — fossil

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, SiO2)

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

Chert Pebble Map

Microcrystalline Quartz (SiO2)

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

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Basalt (River Pebble) (Basalt (Aphanitic Mafic Igneous Rock)) — igneous

Basalt (River Pebble)

Basalt (Aphanitic Mafic Igneous Rock)

Quartzite with Garnet (Garnetiferous Quartzite (SiO2 + X3Y2(SiO4)3)) — metamorphic

Quartzite with Garnet

Garnetiferous Quartzite (SiO2 + X3Y2(SiO4)3)

Jasper (specifically Polychrome or Desert Jasper) (Silicon Dioxide (SiO2) with iron oxide and other mineral impurities) — sedimentary (chemical/biological origin)

Jasper (specifically Polychrome or Desert Jasper)

Silicon Dioxide (SiO2) with iron oxide and other mineral impurities

sedimentary (chemical/biological origin)

Weathered sandstone (Quartz-rich sandstone (clastic sedimentary rock)) — sedimentary

Weathered sandstone

Quartz-rich sandstone (clastic sedimentary rock)

Chert (Chert Nodule with Chalky Cortex) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Chert (Chert Nodule with Chalky Cortex)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert

Cryptocrystalline Quartz (SiO2)

Chert (Red Jasper variant) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Red Jasper variant)

Microcrystalline Quartz (SiO2)

Fossil Shark Tooth (Selachii (fossilized dentition)) — fossil

Fossil Shark Tooth

Selachii (fossilized dentition)

Quartzite Pebble (Quartzite) — metamorphic

Quartzite Pebble

Quartzite

Black Obsidian (Volcanic Glass (felsic)) — igneous

Black Obsidian

Volcanic Glass (felsic)

Sandstone Pebble (Arenite (primarily SiO2)) — sedimentary

Sandstone Pebble

Arenite (primarily SiO2)

Fossilized Coral (Petrified Coral) (Lithostrotionella (example genus) / Scleractinia) — fossil

Fossilized Coral (Petrified Coral)

Lithostrotionella (example genus) / Scleractinia

Concretion or weathered iron-rich rock (Likely limonite/goethite-rich concretion; exact identification requires testing) — sedimentary

Concretion or weathered iron-rich rock

Likely limonite/goethite-rich concretion; exact identification requires testing

Bauxite (Bauxite (Al2O3·2H2O mixed with iron oxides)) — sedimentary

Bauxite

Bauxite (Al2O3·2H2O mixed with iron oxides)

Opal (Hydrated Amorphous Silica (SiO2·nH2O)) — Mineral

Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Quartzite (Yellow/Tan) (Metamorphic Rock composed of Quartz (SiO₂)) — metamorphic

Quartzite (Yellow/Tan)

Metamorphic Rock composed of Quartz (SiO₂)

Anthracite Coal (Low-grade metamorphic carbonaceous rock) — metamorphic

Anthracite Coal

Low-grade metamorphic carbonaceous rock

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Fossiliferous Limestone (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Fossiliferous Limestone

Sedimentary Calcium Carbonate (CaCO3)

Turritella Agate / Fossiliferous Limestone (Elimia tenera in Chalcedony/Calcite Matrix) — fossil

Turritella Agate / Fossiliferous Limestone

Elimia tenera in Chalcedony/Calcite Matrix

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Quartzite Pebble (Metamorphic Quartzite (primarily SiO2)) — metamorphic

Quartzite Pebble

Metamorphic Quartzite (primarily SiO2)

Chert (Polished/Tumbled) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Polished/Tumbled)

Silicon Dioxide (SiO2)

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

Orange Quartzite (River Pebble) (Quartzite (SiO2 with iron oxide inclusions)) — metamorphic

Orange Quartzite (River Pebble)

Quartzite (SiO2 with iron oxide inclusions)