Rock Identifier

Category

Organic (Sedimentary Context)

Browse organic (sedimentary context) specimens identified by the Rock Identifier community.

Learn about Organic (Sedimentary Context) in the encyclopedia

Sapropel

Bituminous Shale

Bituminous Shale

Black Shale

Oil Shale

Chert (specifically Chert Nodule/Flint) (Chert (Silicon Dioxide, SiO2)) — sedimentary

Chert (specifically Chert Nodule/Flint)

Chert (Silicon Dioxide, SiO2)

Picture Jasper (Silicon Dioxide (SiO2) - Opaque Chert/Quartzite variety) — sedimentary

Picture Jasper

Silicon Dioxide (SiO2) - Opaque Chert/Quartzite variety

Chert (Jasper/Common Opal transition) (Microcrystalline Quartz (SiO2) with iron oxide inclusions) — sedimentary

Chert (Jasper/Common Opal transition)

Microcrystalline Quartz (SiO2) with iron oxide inclusions

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

Chert (Flint variety)

Chert (Microcrystalline or Cryptocrystalline Quartz), SiO2

Banded Chert (Microcrystalline silicon dioxide (SiO2)) — sedimentary

Banded Chert

Microcrystalline silicon dioxide (SiO2)

Chert / River Pebble (Microcrystalline Silica (SiO2)) — sedimentary

Chert / River Pebble

Microcrystalline Silica (SiO2)

Honey Calcite (Calcium Carbonate (CaCO3)) — mineral

Honey Calcite

Calcium Carbonate (CaCO3)

Petrified Wood (Silicified Wood) (Silicified Paleoflora (mainly Quartz, SiO2)) — metamorphic

Petrified Wood (Silicified Wood)

Silicified Paleoflora (mainly Quartz, SiO2)

Likely chert or flint (Microcrystalline quartz (SiO₂), commonly called chert; exact identification requires testing) — sedimentary

Likely chert or flint

Microcrystalline quartz (SiO₂), commonly called chert; exact identification requires testing

Ironstone Concretion (Ironstone Gourd) (Limonite/Goethite Concretion (FeOO(H))) — sedimentary

Ironstone Concretion (Ironstone Gourd)

Limonite/Goethite Concretion (FeOO(H))

Calcareous Tufa / Limestone Fragment (Calcium Carbonate (CaCO3)) — sedimentary

Calcareous Tufa / Limestone Fragment

Calcium Carbonate (CaCO3)

Banded Chert (Cryptocrystalline Quartz (SiO2)) — sedimentary

Banded Chert

Cryptocrystalline Quartz (SiO2)

Dendritic Agate / Moss Agate (Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions) — mineral

Dendritic Agate / Moss Agate

Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions

Hardpan Nodule / Ferruginous Sandstone (Ferruginous Sandstone (Fe-cemented sediment)) — sedimentary

Hardpan Nodule / Ferruginous Sandstone

Ferruginous Sandstone (Fe-cemented sediment)

Amber (Succinite (organic gemstone, approx. C10H16O)) — fossil

Amber

Succinite (organic gemstone, approx. C10H16O)

Amber (Succinicum (Succinite); C10H16O) — Mineraloid (Organic)

Amber

Succinicum (Succinite); C10H16O

Mineraloid (Organic)

Pyrite (Pyrite (Iron Disulfide), FeS2) — Mineral

Pyrite

Pyrite (Iron Disulfide), FeS2

Petrified Wood (Petrified Wood (Silicified Wood)) — fossil

Petrified Wood

Petrified Wood (Silicified Wood)

Chert (Flint Nodules) (Sedimentary cryptocrystalline quartz (SiO2)) — sedimentary

Chert (Flint Nodules)

Sedimentary cryptocrystalline quartz (SiO2)

Shark Tooth Fossil (Otodus obliquus (or similar prehistoric lamniform shark tooth)) — fossil

Shark Tooth Fossil

Otodus obliquus (or similar prehistoric lamniform shark tooth)

Petrified Wood (Silicified Wood (primarily Quartz or Chalcedony, SiO2)) — mineral

Petrified Wood

Silicified Wood (primarily Quartz or Chalcedony, SiO2)

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

Fossilized Bone / Dinosaur Fossil

Fossilized vertebrate bone (permineralized)

Shark Tooth Fossil (Carcharodon / Otodus fossilized tooth (Calcium Phosphate / Hydroxyapatite)) — fossil

Shark Tooth Fossil

Carcharodon / Otodus fossilized tooth (Calcium Phosphate / Hydroxyapatite)

Chert (Flint / Jasper / Hornstone) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Flint / Jasper / Hornstone)

Microcrystalline Quartz (SiO2)

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

Petrified Wood

Silicified Wood (primarily Quartz/SiO2)

Petrified Wood (Silicified Wood (Permineralized organic matter, głównie $SiO_2$)) — fossil

Petrified Wood

Silicified Wood (Permineralized organic matter, głównie $SiO_2$)

Fossil bivalve shell (Likely an extinct or modern-like ribbed cockle/scallop; exact genus requires locality and diagnostic hinge features) — fossil

Fossil bivalve shell

Likely an extinct or modern-like ribbed cockle/scallop; exact genus requires locality and diagnostic hinge features

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Limestone (Weathered) (Sedimentary carbonate rock, primarily calcium carbonate (CaCO3)) — sedimentary

Limestone (Weathered)

Sedimentary carbonate rock, primarily calcium carbonate (CaCO3)

Fossiliferous Limestone (Limestone (CaCO3 with Limonite/Goethite staining)) — sedimentary

Fossiliferous Limestone

Limestone (CaCO3 with Limonite/Goethite staining)

Chert Pebble (with fossil shell fragment) (Microcrystalline Quartz (SiO2) with Calcified Invertebrate Impression) — sedimentary

Chert Pebble (with fossil shell fragment)

Microcrystalline Quartz (SiO2) with Calcified Invertebrate Impression

Calcareous Tufa (Tufa (Calcium Carbonate, CaCO3)) — sedimentary

Calcareous Tufa

Tufa (Calcium Carbonate, CaCO3)

Red Sandstone (Arenite (Iron-rich Sandstone)) — sedimentary

Red Sandstone

Arenite (Iron-rich Sandstone)

Chert (with Manganese Oxide coating) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (with Manganese Oxide coating)

Microcrystalline Quartz (SiO2)

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

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Nodule) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Nodule)

Silicon Dioxide (SiO2)

Coquina Limestone (Fossiliferous Limestone) (Calcareous bioclastic sedimentary rock (CaCO3)) — sedimentary

Coquina Limestone (Fossiliferous Limestone)

Calcareous bioclastic sedimentary rock (CaCO3)

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

Chert Pebble (Jasper variant)

Microcrystalline Quartz (SiO2)

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

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Chert (Brown Variety) (Silicon dioxide (SiO2)) — sedimentary

Chert (Brown Variety)

Silicon dioxide (SiO2)

Petrified Wood (Silicified wood (SiO2 - Silicon Dioxide)) — sedimentary

Petrified Wood

Silicified wood (SiO2 - Silicon Dioxide)

Fancy Jasper (Silicon dioxide (SiO2)) — sedimentary

Fancy Jasper

Silicon dioxide (SiO2)