Rock Identifier

Category

Fossil

Browse fossil specimens identified by the Rock Identifier community.

Learn about Fossil in the encyclopedia

Fossil Opal

Fossil Opal

Amber

Amber

Bone Opal

Bone Opal

Turritella Jasper

Turritella Jasper

Fossiliferous Limestone

Fossiliferous Limestone

Turritella Agate

Turritella Agate

Petrified Wood

Petrified Wood

Diatomite

Diatomite

Guano

Guano

Jet

Jet

Diatomaceous Earth

Diatomaceous Earth

Opalized Wood

Opalized Wood

Shale with Plant Fossils / Carbonaceous Shale (Laminated Mudrock (Siliciclastic)) — sedimentary

Shale with Plant Fossils / Carbonaceous Shale

Laminated Mudrock (Siliciclastic)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

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

Chert (Nodule)

Silicon Dioxide (SiO2)

Glaucophane-bearing Schist (Blueschist) (Blueschist (Glaucophane-Lawsonite Schist)) — metamorphic

Glaucophane-bearing Schist (Blueschist)

Blueschist (Glaucophane-Lawsonite Schist)

Slate (Foliated low-grade metamorphic rock) — metamorphic

Slate

Foliated low-grade metamorphic rock

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)

Fossilized Shark Tooth (Fossilized elasmobranch tooth (Apatite/Calcium Phosphate)) — sedimentary

Fossilized Shark Tooth

Fossilized elasmobranch tooth (Apatite/Calcium Phosphate)

Limestone (with possible Manganese oxide inclusions) (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone (with possible Manganese oxide inclusions)

Sedimentary Calcium Carbonate (CaCO3)

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

River Pebble (Quartz/Chert)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous) (Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)) — sedimentary

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)

Sandstone (Quartzose) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Quartzose)

Arenite (primarily SiO2)

Limestone (Calcium Carbonate (CaCO3)) — Sedimentary

Limestone

Calcium Carbonate (CaCO3)

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Limestone (Limestone (Calcium Carbonate - CaCO3)) — sedimentary

Limestone

Limestone (Calcium Carbonate - CaCO3)

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

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone with Vitrinite/Coal inclusions (Arenite with Carbonaceous inclusions) — sedimentary

Sandstone with Vitrinite/Coal inclusions

Arenite with Carbonaceous inclusions

Sandstone (Quartzose Sandstone) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Coal (Bituminous) (Sedimentary carbonaceous rock) — sedimentary

Coal (Bituminous)

Sedimentary carbonaceous rock

River Cobble (Conglomerate context) (Unconsolidated Fluvial Alluvium (comprised of various lithologies like Quartzite, Granite, or Basalt)) — sedimentary

River Cobble (Conglomerate context)

Unconsolidated Fluvial Alluvium (comprised of various lithologies like Quartzite, Granite, or Basalt)

Sandstone (with cross-bedding) (Arenite (composed primarily of Quartz: SiO2)) — sedimentary

Sandstone (with cross-bedding)

Arenite (composed primarily of Quartz: SiO2)

Sandstone (Red Sandstone) (Arenite) — sedimentary

Sandstone (Red Sandstone)

Arenite

Sandstone (Quartzose Sandstone) (Clastic sedimentary rock (SiO2 dominated)) — sedimentary

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (SiO2 dominated)

Sandstone (clastic) (Clastic Sedimentary Rock (primarily composed of SiO2)) — sedimentary

Sandstone (clastic)

Clastic Sedimentary Rock (primarily composed of SiO2)

Siltstone (Siltstone (composed of microscopic silt-sized particles of quartz and feldspar)) — sedimentary

Siltstone

Siltstone (composed of microscopic silt-sized particles of quartz and feldspar)

Shale (Fissile mudrock (composed of clay-sized particles and detrital grains)) — sedimentary

Shale

Fissile mudrock (composed of clay-sized particles and detrital grains)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Shale (Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)) — sedimentary

Shale

Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)

Chert (with inclusions) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (with inclusions)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Ironstone (Limonitic Sandstone) (Ferruginous Sandstone (rich in Limonite: FeO(OH)·nH2O)) — sedimentary

Ironstone (Limonitic Sandstone)

Ferruginous Sandstone (rich in Limonite: FeO(OH)·nH2O)

Siltstone (Siltstone (primarily SiO2 with Al2O3 and Fe2O3)) — sedimentary

Siltstone

Siltstone (primarily SiO2 with Al2O3 and Fe2O3)

Fossilized Shark Tooth (Carcharodon carcharias (fossilized) / Hydroxyapatite permineralized with silica or iron) — sedimentary

Fossilized Shark Tooth

Carcharodon carcharias (fossilized) / Hydroxyapatite permineralized with silica or iron

Fossilized Crinoid Stem (Class Crinoidea (Echinodermata)) — sedimentary

Fossilized Crinoid Stem

Class Crinoidea (Echinodermata)

Chert (Nodular) (Chert (SiO2 - Microcrystalline Quartz)) — sedimentary

Chert (Nodular)

Chert (SiO2 - Microcrystalline Quartz)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Granitic Gneiss (Gneiss (Metamorphic Rock)) — metamorphic

Granitic Gneiss

Gneiss (Metamorphic Rock)

Chert / Flint (Microcrystalline Silica (SiO2)) — sedimentary

Chert / Flint

Microcrystalline Silica (SiO2)

Quartzite with Vugs (Metamorphosed Quartz Sandstone (SiO2)) — metamorphic

Quartzite with Vugs

Metamorphosed Quartz Sandstone (SiO2)

Sandstone (Quartzite texture) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (Quartzite texture)

Clastic sedimentary rock (primarily SiO2)

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

Sandstone (with manganese staining) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (with manganese staining)

Clastic sedimentary rock (primarily SiO2)