Rock Identifier

Category

Mineral (Organic)

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

Learn about Mineral (Organic) in the encyclopedia

Sapropel

Black Shale

Bituminous Shale

Bituminous Shale

Glauconite

Hutcheonite

Halite

Sperrylite

Baddeleyite

Anatase

Brookite

Talc

Euxenite

Fossil Shark Tooth (Sand Tiger Shark type) (Carcharias sp. (likely Odontaspis)) — fossil

Fossil Shark Tooth (Sand Tiger Shark type)

Carcharias sp. (likely Odontaspis)

Fossilized Shark Tooth (Chondrichthyes (Class) - likely Carcharodon or Otodus genus) — fossil

Fossilized Shark Tooth

Chondrichthyes (Class) - likely Carcharodon or Otodus genus

Jasper (Silicon Dioxide (SiO2) with impurities) — sedimentary

Jasper

Silicon Dioxide (SiO2) with impurities

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

Petrified Wood

Silicified Wood (primarily SiO2)

Bivalve Fossil in Sedimentary Matrix (Fossiliferous Mudstone (Class: Bivalvia)) — sedimentary

Bivalve Fossil in Sedimentary Matrix

Fossiliferous Mudstone (Class: Bivalvia)

Petrified Wood (Silicified Wood) (Silicified fossil wood (SiO2)) — metamorphic

Petrified Wood (Silicified Wood)

Silicified fossil wood (SiO2)

Ironstone Concretion / Limonite Node (Goethite and Limonite (FeO(OH) nH2O)) — sedimentary

Ironstone Concretion / Limonite Node

Goethite and Limonite (FeO(OH) nH2O)

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

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

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

Petrified Wood

Silicified Wood (primarily Chalcedony or Quartz, SiO2)

Fossilized Coral (Cnidaria (Anthozoa), often replaced by Calcium Carbonate (CaCO3) or Silica (SiO2)) — sedimentary

Fossilized Coral

Cnidaria (Anthozoa), often replaced by Calcium Carbonate (CaCO3) or Silica (SiO2)

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

Chert (Jasper variety)

Silicon dioxide (SiO2)

Glauconitic Sandstone (Glauconite-bearing Arenite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2) — sedimentary

Glauconitic Sandstone

Glauconite-bearing Arenite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Yellow-brown translucent mineral fragment, likely citrine or amber (Quartz (SiO₂), if citrine; succinite (fossil resin), if amber) — mineral

Yellow-brown translucent mineral fragment, likely citrine or amber

Quartz (SiO₂), if citrine; succinite (fossil resin), if amber

Ironstone Concretion (Ironstone (Limonite/Goethite Concretion)) — sedimentary

Ironstone Concretion

Ironstone (Limonite/Goethite Concretion)

Zebra Rock / Zebra Marble (Banded Limestone-Marble Transition) — metamorphic

Zebra Rock / Zebra Marble

Banded Limestone-Marble Transition

Petrified Wood (Silicon Dioxide (SiO2)) — fossil

Petrified Wood

Silicon Dioxide (SiO2)

Septarian Nodule (Septarian Nodule (Calcite, Aragonite, and Limestone/Claystone)) — sedimentary

Septarian Nodule

Septarian Nodule (Calcite, Aragonite, and Limestone/Claystone)

Calligraphy Stone (Mariam Jasper (Fossiliferous Limestone with Hematite and Iron)) — sedimentary

Calligraphy Stone

Mariam Jasper (Fossiliferous Limestone with Hematite and Iron)

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

Chert (Jasper/Flint variant)

Silicon Dioxide (SiO2)

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

Chert (Jasper variation)

Silicon Dioxide (SiO2)

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

Chert (Flint)

Microcrystalline quartz (SiO2)

Petrified Wood (Silicified wood (primarily quartz, SiO2)) — sedimentary

Petrified Wood

Silicified wood (primarily quartz, SiO2)

Petrified Wood (Silicified Wood (Silicon Dioxide - SiO2)) — fossil

Petrified Wood

Silicified Wood (Silicon Dioxide - SiO2)

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Sandstone Chert Concretion (Silica-cemented Concretion (primarily SiO2)) — sedimentary

Sandstone Chert Concretion

Silica-cemented Concretion (primarily SiO2)

Sandstone (Weathered Coastal Boulder) (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone (Weathered Coastal Boulder)

Arenite (composed primarily of SiO2)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Granite / Feldspar gravel (Granite (felsic intrusive igneous rock)) — igneous

Granite / Feldspar gravel

Granite (felsic intrusive igneous rock)

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

Chert (Flint Pebbles)

Microcrystalline Quartz (SiO2)

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

Chert (often called Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Ironstone Concretion (Boxwork) (Siderite-Limonite Concretion (FeO(OH)·nH2O)) — sedimentary

Ironstone Concretion (Boxwork)

Siderite-Limonite Concretion (FeO(OH)·nH2O)

Carved pyrite frog or toad (Pyrite (iron disulfide, FeS₂), likely a carved massive aggregate) — mineral

Carved pyrite frog or toad

Pyrite (iron disulfide, FeS₂), likely a carved massive aggregate

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

Petrified Wood

Silicified wood (primarily SiO2 - Silicon Dioxide/Quartz)

Septarian Pebble (Septarian nodule / Concretion) — sedimentary

Septarian Pebble

Septarian nodule / Concretion

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

Banded Chert

Chert (Microcrystalline Quartz, SiO2)

Amber (Rough) (Amber (Fossilized Tree Resin, succinite)) — mineral

Amber (Rough)

Amber (Fossilized Tree Resin, succinite)

Moss Agate (Cryptocrystalline Quartz (SiO2 with Manganese or Iron Oxide inclusions)) — mineral

Moss Agate

Cryptocrystalline Quartz (SiO2 with Manganese or Iron Oxide inclusions)

Fossilized bivalve shell (Calcitic or aragonitic mollusk shell, commonly Bivalvia; exact species indeterminate) — fossil

Fossilized bivalve shell

Calcitic or aragonitic mollusk shell, commonly Bivalvia; exact species indeterminate

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

Geode (unopened)

Chert / Chalcedony Geode (SiO2)

Fossilized Chiton (Polyplacophora) (Polyplacophora (fossilized valves)) — mineralized fossil

Fossilized Chiton (Polyplacophora)

Polyplacophora (fossilized valves)

mineralized fossil

Pearl (Biogenic Mineral) (Calcium Carbonate (primarily Aragonite) with Conchiolin; CaCO3) — mineral

Pearl (Biogenic Mineral)

Calcium Carbonate (primarily Aragonite) with Conchiolin; CaCO3