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 Pebble (Quartzite (SiO2)) — metamorphic

Quartzite Pebble

Quartzite (SiO2)

Shale (Shale (composition varies: primarily clay minerals and quartz)) — sedimentary

Shale

Shale (composition varies: primarily clay minerals and quartz)

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

Chert (Pebble)

Microcrystalline Quartz (SiO2)

Anthracite Coal (Anthracite (Carbon-based sedimentary-metamorphic rock)) — metamorphic

Anthracite Coal

Anthracite (Carbon-based sedimentary-metamorphic rock)

Seashell Fossil (Gastropoda fossil) — fossil

Seashell Fossil

Gastropoda fossil

Iron-stained weathered granite or granitic gneiss (Granite/granitic gneiss, dominated by quartz, feldspar, and mica, with iron-oxide weathering) — igneous

Iron-stained weathered granite or granitic gneiss

Granite/granitic gneiss, dominated by quartz, feldspar, and mica, with iron-oxide weathering

Amber (Succinite (formula varies, primarily C10H16O)) — Mineraloid (Organic)

Amber

Succinite (formula varies, primarily C10H16O)

Mineraloid (Organic)

Rounded quartz-rich river cobble (Likely quartzite or quartz-rich sandstone (SiO₂-dominant), possibly weathered chert) — sedimentary

Rounded quartz-rich river cobble

Likely quartzite or quartz-rich sandstone (SiO₂-dominant), possibly weathered chert

Unakite (Epidotized Granite) — metamorphic

Unakite

Epidotized Granite

White Marble (Metamorphic carbonate rock (primarily CaCO3)) — metamorphic

White Marble

Metamorphic carbonate rock (primarily CaCO3)

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

Quartzite River Rock

Quartzite (primarily SiO2)

Quartzite River Rock (Metaquartzite (majorly SiO2)) — metamorphic

Quartzite River Rock

Metaquartzite (majorly SiO2)

Tektite (Impactite (Natural Silicate Glass)) — meteorite

Tektite

Impactite (Natural Silicate Glass)

Sandstone (Sandstone (SiO2 predominant)) — sedimentary

Sandstone

Sandstone (SiO2 predominant)

Limestone (Calcareous sedimentary rock (CaCO3)) — sedimentary

Limestone

Calcareous sedimentary rock (CaCO3)

Quartzite Pebble (Metamorphosed Quartz Sandstone (SiO2)) — metamorphic

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Fossilized Coral (Rugosa or Tabulata coral fossil) — fossil

Fossilized Coral

Rugosa or Tabulata coral fossil

Likely gabbro (dark, coarse-grained rock) (Gabbro, a mafic intrusive igneous rock composed mainly of plagioclase feldspar and pyroxene) — igneous

Likely gabbro (dark, coarse-grained rock)

Gabbro, a mafic intrusive igneous rock composed mainly of plagioclase feldspar and pyroxene

Starfish Fossil (Asteroidea fossil) — fossil

Starfish Fossil

Asteroidea fossil

Banded Chert (Chert (Silicon Dioxide, SiO2)) — sedimentary

Banded Chert

Chert (Silicon Dioxide, SiO2)

Chert (Limestone/Flint variant) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Limestone/Flint variant)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Red Jasper with Quartz (Microcrystalline Quartz (SiO2)) — sedimentary

Red Jasper with Quartz

Microcrystalline Quartz (SiO2)

Chert (specifically Jasper/Brown Chert) (Silicon Dioxide (SiO2)) — sedimentary

Chert (specifically Jasper/Brown Chert)

Silicon Dioxide (SiO2)

Chert (varieties include Flint and Jasper) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (varieties include Flint and Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Jasper (Silicon dioxide (SiO2)) — sedimentary

Jasper

Silicon dioxide (SiO2)

Chert with Calcite Veins (Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) intrusions) — sedimentary

Chert with Calcite Veins

Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) intrusions

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

Fossiliferous Limestone (Coquina)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Geode (Unopened) (SiO2 (Quartz-filled Sedimentary Nodule)) — sedimentary

Geode (Unopened)

SiO2 (Quartz-filled Sedimentary Nodule)

Quartzite (Quartzite (Metamorphic rock composed primarily of quartz)) — metamorphic

Quartzite

Quartzite (Metamorphic rock composed primarily of quartz)

Obsidian with Slate/Tuff (Volcanic glass (SiO2) with associated pyroclastic rock) — igneous

Obsidian with Slate/Tuff

Volcanic glass (SiO2) with associated pyroclastic rock

Siltstone (Siltstone (fined-grained clastic sedimentary rock)) — sedimentary

Siltstone

Siltstone (fined-grained clastic sedimentary rock)

Yellow Ochre / Limonite (Limonite (FeO(OH)·nH2O)) — Mineral

Yellow Ochre / Limonite

Limonite (FeO(OH)·nH2O)

Red Quartzite (Quartzite (primarily SiO2)) — metamorphic

Red Quartzite

Quartzite (primarily SiO2)

Pearl strand (Nacreous pearl, primarily aragonite (CaCO₃) with conchiolin protein) — gemstone

Pearl strand

Nacreous pearl, primarily aragonite (CaCO₃) with conchiolin protein

Smurf Rock (Fictional Interpretation) (Cyanus Anthropomorphicus (Geologic Simulation)) — Artificial/Fantasy Object

Smurf Rock (Fictional Interpretation)

Cyanus Anthropomorphicus (Geologic Simulation)

Artificial/Fantasy Object

Quartzite Pebble (Quartzite) — metamorphic

Quartzite Pebble

Quartzite

Obsidian (Obsidian (Amorphous volcanic glass)) — igneous

Obsidian

Obsidian (Amorphous volcanic glass)

Fossiliferous Limestone (Biogenic Sedimentary Rock (Calcium Carbonate)) — sedimentary

Fossiliferous Limestone

Biogenic Sedimentary Rock (Calcium Carbonate)

Fossiliferous Limestone (Biogenic Sedimentary Rock (Calcium Carbonate)) — sedimentary

Fossiliferous Limestone

Biogenic Sedimentary Rock (Calcium Carbonate)