Rock Identifier

Category

Organic Material

Browse organic material specimens identified by the Rock Identifier community.

Learn about Organic Material in the encyclopedia

Peat

Sapropel

Bituminous Shale

Bituminous Shale

Black Shale

Petrified Wood

Amber

Jet

Oil Shale

Pearl

Lizard Skin Jasper

Dunite

Opalized Wood

Fossilized Turtle Shell (Testudines fossil) — fossil

Fossilized Turtle Shell

Testudines fossil

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

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

Chert (variations include Flint/Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (often called Flint) (Chert (Cryptocrystalline Silica, SiO2)) — sedimentary

Chert (often called Flint)

Chert (Cryptocrystalline Silica, SiO2)

Tyrannosaurus Rex Fossil Skull (Tyrannosaurus rex) — fossil

Tyrannosaurus Rex Fossil Skull

Tyrannosaurus rex

Petrified Wood (Silicified Wood (primarily SiO2)) — sedimentary

Petrified Wood

Silicified Wood (primarily SiO2)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Mammoth or Mastodon Tooth Fragment (Mammuthus / Mammut molar fragment) — fossil

Mammoth or Mastodon Tooth Fragment

Mammuthus / Mammut molar fragment

Chert (often called Flint in this context) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (often called Flint in this context)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Limestone (Carved Statue) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (Carved Statue)

Calcium Carbonate (CaCO3)

Petrified wood (Silicified wood, commonly quartz (SiO₂) replacing woody tissue) — fossil

Petrified wood

Silicified wood, commonly quartz (SiO₂) replacing woody tissue

Chert (likely brown flint) (Microcrystalline quartz, SiO₂ (chalcedonic quartz aggregate)) — sedimentary

Chert (likely brown flint)

Microcrystalline quartz, SiO₂ (chalcedonic quartz aggregate)

Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Chert

Microcrystalline Quartz (SiO2)

Chert Pebble (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Pebble

Microcrystalline Quartz (SiO2)

Limestone (Sedimentary rock composed mainly of calcite (CaCO3)) — sedimentary

Limestone

Sedimentary rock composed mainly of calcite (CaCO3)

Chert (Flint Nodules) (Silicon dioxide (SiO2)) — sedimentary

Chert (Flint Nodules)

Silicon dioxide (SiO2)

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

Chert (Jasper/Flint)

Microcrystalline Quartz (SiO2)

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

Chert (Flint)

Chert (SiO2)

Dark gray flint or chert fragment (Microcrystalline quartz (SiO₂), commonly with minor chalcedony and impurities) — sedimentary

Dark gray flint or chert fragment

Microcrystalline quartz (SiO₂), commonly with minor chalcedony and impurities

Chert (Jasper variety) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert Nodule (Flint) (Cryptocrystalline quartz (SiO2)) — sedimentary

Chert Nodule (Flint)

Cryptocrystalline quartz (SiO2)

Chert (Flint/Jasper) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Flint/Jasper)

Silicon Dioxide (SiO2)

Fossilized wood fragment (Petrified wood; commonly silicified fossil wood (SiO₂ replacing organic tissue)) — fossil

Fossilized wood fragment

Petrified wood; commonly silicified fossil wood (SiO₂ replacing organic tissue)

Chert (often called Flint or Jasper) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (often called Flint or Jasper)

Microcrystalline quartz (SiO2)

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

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, SiO2)

Petrified Wood (Silicified Wood (Permineralized Lycopsid, Conifer, or Hardwood)) — fossil

Petrified Wood

Silicified Wood (Permineralized Lycopsid, Conifer, or Hardwood)

Mosasaur Tooth (Mosasaurus sp.) — fossil

Mosasaur Tooth

Mosasaurus sp.

Petrified Wood (Silicified Wood (SiO2 permineralization)) — fossil

Petrified Wood

Silicified Wood (SiO2 permineralization)

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

Petrified Wood

Silicified Wood (mainly Quartz / SiO2)

Fossilized Shark Tooth (Chondrichthyes (class)) — fossil

Fossilized Shark Tooth

Chondrichthyes (class)

Fossil Shark Tooth (Carcharodon or Carcharias fossil (Vertebrate Fossil)) — sedimentary

Fossil Shark Tooth

Carcharodon or Carcharias fossil (Vertebrate Fossil)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Tiger Shark Fossil Tooth (Galeocerdo cuvier (fossilized)) — sedimentary

Tiger Shark Fossil Tooth

Galeocerdo cuvier (fossilized)

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

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

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

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Limestone (Sedimentary rock composed mainly of calcite (CaCO3)) — sedimentary

Limestone

Sedimentary rock composed mainly of calcite (CaCO3)

Fossiliferous Limestone (Biogenic Limestone (CaCO3)) — sedimentary

Fossiliferous Limestone

Biogenic Limestone (CaCO3)

Chert (Flint) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Chert (Flint)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Petrified Wood / Red Jasper (Silicified wood (primarily Silicon Dioxide, SiO2)) — sedimentary

Petrified Wood / Red Jasper

Silicified wood (primarily Silicon Dioxide, SiO2)

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

Chert (Jasper)

Silicon Dioxide (SiO2)