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

Quartzite (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite

Metamorphic Quartzite (SiO2)

Pumice (Pumice (Amorphous volcanic glass)) — igneous

Pumice

Pumice (Amorphous volcanic glass)

Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

Quartzite Cobble (Quartzite (SiO2)) — metamorphic

Quartzite Cobble

Quartzite (SiO2)

Obsidian (Volcanic glass (mainly SiO2)) — Igneous

Obsidian

Volcanic glass (mainly SiO2)

Quartzite with Iron Inclusions (Metamorphosed Quartz-rich Rock (SiO2)) — metamorphic

Quartzite with Iron Inclusions

Metamorphosed Quartz-rich Rock (SiO2)

Quartzite (Metamorphic Rock (Quartzite), primarily SiO2) — metamorphic

Quartzite

Metamorphic Rock (Quartzite), primarily SiO2

Quartzite (Quartzite (SiO2-rich metamorphic rock)) — metamorphic

Quartzite

Quartzite (SiO2-rich metamorphic rock)

Quartzite with inclusions (Metamorphosed Quartz-rich Rock (SiO2)) — metamorphic

Quartzite with inclusions

Metamorphosed Quartz-rich Rock (SiO2)

Quartzite (Metamorphic Rock (composed mainly of SiO2)) — metamorphic

Quartzite

Metamorphic Rock (composed mainly of SiO2)

Quartzite pebble (Quartzite (SiO2)) — metamorphic

Quartzite pebble

Quartzite (SiO2)

River Pebble (Greywacke or Quartzite-rich Sandstone) (Lithic Sandstone (primarily SiO2 with rock fragments)) — sedimentary

River Pebble (Greywacke or Quartzite-rich Sandstone)

Lithic Sandstone (primarily SiO2 with rock fragments)

Basaltic Tuff / Volcanic Breccia (Pyroclastic Breccia / Lithic Tuff) — igneous

Basaltic Tuff / Volcanic Breccia

Pyroclastic Breccia / Lithic Tuff

Quartzite (Quartzite (chiefly SiO2)) — metamorphic

Quartzite

Quartzite (chiefly SiO2)

Geode (unopened) (Chert / Chalcedony Geode (SiO2)) — sedimentary

Geode (unopened)

Chert / Chalcedony Geode (SiO2)

Chert (Common Opal or Agate) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Common Opal or Agate)

Microcrystalline Quartz (SiO2)

Fossilized Bark (Lepidodendron / Sigillaria fossil impression) — fossil

Fossilized Bark

Lepidodendron / Sigillaria fossil impression

Quartzite (Quartzite (chiefly SiO2)) — metamorphic

Quartzite

Quartzite (chiefly SiO2)

Quartzite (Quartzite (SiO2 silicon dioxide)) — metamorphic

Quartzite

Quartzite (SiO2 silicon dioxide)

Chert / Chalcedony (Silicon Dioxide (SiO2)) — sedimentary

Chert / Chalcedony

Silicon Dioxide (SiO2)

Shale (Shale (Consolidated fine-grained clay/silt)) — sedimentary

Shale

Shale (Consolidated fine-grained clay/silt)

Quartzite Cobble (Quartzite (mostly SiO2)) — metamorphic

Quartzite Cobble

Quartzite (mostly SiO2)

Obsidian Arrowhead (Obsidian (Volcanic Glass)) — igneous

Obsidian Arrowhead

Obsidian (Volcanic Glass)

Green Opal (Hydrated amorphous silica (SiO2·nH2O)) — mineral

Green Opal

Hydrated amorphous silica (SiO2·nH2O)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

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

Chert / Flint

Cryptocrystalline Quartz (SiO2)

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

Possible fossilized shell or coral fragment (Indeterminate biogenic carbonate, likely calcite (CaCO₃)) — fossil

Possible fossilized shell or coral fragment

Indeterminate biogenic carbonate, likely calcite (CaCO₃)

Probable amber fragment (Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)) — gemstone

Probable amber fragment

Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)

Quartzite River Stone (Quartzite (primarily SiO2)) — metamorphic

Quartzite River Stone

Quartzite (primarily SiO2)

Green Slate or Metamorphic Rock with Moss/Lichen (Metamorphic rock / Phyllite or Slate variant) — metamorphic

Green Slate or Metamorphic Rock with Moss/Lichen

Metamorphic rock / Phyllite or Slate variant

Polished banded gneiss (Biotite–quartz–feldspar gneiss, locally migmatitic) — metamorphic

Polished banded gneiss

Biotite–quartz–feldspar gneiss, locally migmatitic

Rounded dark river stone (Likely basalt or fine-grained andesite; exact identification requires testing) — igneous

Rounded dark river stone

Likely basalt or fine-grained andesite; exact identification requires testing

Fossiliferous Limestone (Biogenic Sedimentary Rock (CaCO3)) — sedimentary

Fossiliferous Limestone

Biogenic Sedimentary Rock (CaCO3)

Fossiliferous Limestone (Coquina) (Biogenic Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Fossiliferous Limestone (Coquina)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Gneiss (Metamorphic Gneiss) — metamorphic

Gneiss

Metamorphic Gneiss

Claystone / Mudstone (Mudstone (Hydrous aluminum silicate rich rock)) — sedimentary

Claystone / Mudstone

Mudstone (Hydrous aluminum silicate rich rock)

Sandstone Pebble (Arenite (SiO2 based)) — sedimentary

Sandstone Pebble

Arenite (SiO2 based)

Limestone (specifically Grainstone or Micrite) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (specifically Grainstone or Micrite)

Calcium Carbonate (CaCO3)

Chert (Flint) (Chert (SiO2)) — sedimentary

Chert (Flint)

Chert (SiO2)

Chert (Flint) (Chert (̑SiO2)) — sedimentary

Chert (Flint)

Chert (̑SiO2)

Chert (Black Flint) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Black Flint)

Silicon Dioxide (SiO2)