Rock Identifier

Category

Organic Structure (Not A Rock)

Browse organic structure (not a rock) specimens identified by the Rock Identifier community.

Learn about Organic Structure (Not A Rock) in the encyclopedia

Bituminous Shale

Bituminous Shale

Black Shale

Oil Shale

Petrified Wood

Crocodile Jasper

Crocodile Jasper

Opalized Wood

Rock Salt

Rock Gypsum

Coral Rock

Asphalt Rock

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Fossilized Shell in Limestone (Carbonate sedimentary rock with Bivalvia or Brachiopoda remains) — fossil

Fossilized Shell in Limestone

Carbonate sedimentary rock with Bivalvia or Brachiopoda remains

Chert (Iron-stained) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

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

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Fossilized Bone / Dinosaur Fossil (Fossilized vertebrate bone (permineralized)) — fossil

Fossilized Bone / Dinosaur Fossil

Fossilized vertebrate bone (permineralized)

White limestone or chalky carbonate rock (Calcite-rich limestone; possibly chalk (CaCO₃)) — sedimentary

White limestone or chalky carbonate rock

Calcite-rich limestone; possibly chalk (CaCO₃)

Chert (Green River Chert) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Green River Chert)

Microcrystalline Quartz (SiO2)

Chert (Field Stone) (Chert (SiO2)) — sedimentary

Chert (Field Stone)

Chert (SiO2)

Chert (Yellow/Tan) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Yellow/Tan)

Microcrystalline Quartz (SiO2)

Fossiliferous Limestone or Shale (Biomicrite (if limestone) or Fossiliferous Shale) — sedimentary

Fossiliferous Limestone or Shale

Biomicrite (if limestone) or Fossiliferous Shale

Shale (possibly Carbonaceous or Oil Shale) (Laminated Mudstone (primarily clay minerals and quartz)) — sedimentary

Shale (possibly Carbonaceous or Oil Shale)

Laminated Mudstone (primarily clay minerals and quartz)

Weathered gray-green rock fragment (Likely shale or mudstone; exact identification requires testing) — sedimentary

Weathered gray-green rock fragment

Likely shale or mudstone; exact identification requires testing

Chert (specifically Flint or Gray Chalcedony) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (specifically Flint or Gray Chalcedony)

Microcrystalline Quartz (SiO2)

Siltstone with Fossil Cast (Sedimentary Rock (Siltstone / Fine-grained Sandstone)) — sedimentary

Siltstone with Fossil Cast

Sedimentary Rock (Siltstone / Fine-grained Sandstone)

Shale (Mudrock / Fissile Shale) — sedimentary

Shale

Mudrock / Fissile Shale

Sandstone (Glauconitic) (Glauconitic Quartz Sandstone (SiO2 + (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)) — sedimentary

Sandstone (Glauconitic)

Glauconitic Quartz Sandstone (SiO2 + (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)

Petrified Wood (Silicified Wood (primarily SiO2 - Silicon Dioxide / Chalcedony)) — metamorphic

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide / Chalcedony)

Chert (Iron-stained) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Iron-stained)

Silicon Dioxide (SiO2)

Chert Pebble (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Pebble

Microcrystalline Quartz (SiO2)

Chert (River Pebble) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (River Pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fossilized Dinosaur Bone (Perineralized Bone (Fluorapatite/Quartz replacement)) — fossil

Fossilized Dinosaur Bone

Perineralized Bone (Fluorapatite/Quartz replacement)

Moss Agate (Chalcedony (Silicon Dioxide) with dendritic inclusions (SiO2)) — mineral

Moss Agate

Chalcedony (Silicon Dioxide) with dendritic inclusions (SiO2)

Chert Pebble (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Pebble

Microcrystalline Quartz (SiO2)

Pyrite in Slate or Shale (Iron Sulfide (FeS2) in Argillaceous Matrix) — mineral

Pyrite in Slate or Shale

Iron Sulfide (FeS2) in Argillaceous Matrix

Sandstone Concretion (Clastic sedimentary rock (primarily Quartz SiO2)) — sedimentary

Sandstone Concretion

Clastic sedimentary rock (primarily Quartz SiO2)

Chert (containing Flint and Calcareous inclusions) (Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) impurities) — sedimentary

Chert (containing Flint and Calcareous inclusions)

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

Chert (Quartz Pebble) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Quartz Pebble)

Silicon Dioxide (SiO2)

Precious Red Coral (Corallium rubrum / Corallium japonicum) — mineral (organic gemstone)

Precious Red Coral

Corallium rubrum / Corallium japonicum

mineral (organic gemstone)

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

Chert (Pebble)

Microcrystalline silica (SiO2)

Polished agate-like stone (uncertain; possibly a fossil or shell fragment) (Likely microcrystalline quartz (chalcedony), SiO₂; exact identification is limited by the image) — mineral

Polished agate-like stone (uncertain; possibly a fossil or shell fragment)

Likely microcrystalline quartz (chalcedony), SiO₂; exact identification is limited by the image

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

Banded Chert (Flint)

Silicon Dioxide (SiO2)

Pyrite in Shale (Iron Disulfide (FeS2) in Argillaceous Shale) — sedimentary

Pyrite in Shale

Iron Disulfide (FeS2) in Argillaceous Shale

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

Chert (Chert Pebble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (Jasper/Flint variety) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Gastropod Fossil (Snail Steinkern) (Class Gastropoda (internal mold)) — sedimentary

Gastropod Fossil (Snail Steinkern)

Class Gastropoda (internal mold)

Chert with Quartz/Calcite Vein (Microcrystalline Silica (SiO2)) — sedimentary

Chert with Quartz/Calcite Vein

Microcrystalline Silica (SiO2)

Chert (Iron-stained) (Chert (Silicon Dioxide, SiO2)) — sedimentary

Chert (Iron-stained)

Chert (Silicon Dioxide, SiO2)

Amber (Copal) (Succinite (fossilized resin)) — mineral

Amber (Copal)

Succinite (fossilized resin)

Chert (Iron-stained) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Possible fossilized ammonite or concretion (Indeterminate fossil specimen; possibly an ammonoid mold/cast in iron-rich sedimentary rock) — fossil

Possible fossilized ammonite or concretion

Indeterminate fossil specimen; possibly an ammonoid mold/cast in iron-rich sedimentary rock

Moss Agate (Agate (Silicon Dioxide, SiO2) with dendritic inclusions) — sedimentary

Moss Agate

Agate (Silicon Dioxide, SiO2) with dendritic inclusions

Chert (and Limestone Pebbles) (Silicon Dioxide (SiO2) / Sedimentary Microcrystalline Quartz) — sedimentary

Chert (and Limestone Pebbles)

Silicon Dioxide (SiO2) / Sedimentary Microcrystalline Quartz

Fossiliferous Limestone (Carbonate sedimentary rock with trace fossils (CaCO3)) — sedimentary

Fossiliferous Limestone

Carbonate sedimentary rock with trace fossils (CaCO3)