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

Sandstone (Quartz-rich) (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone (Quartz-rich)

Arenite (composed primarily of SiO2)

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

Grey Limestone Pebble

Limestone (Calcium Carbonate - CaCO3)

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

Chert Pebble

Chert (Microcrystalline Quartz, SiO2)

Limestone (Brecciated/Recrystallized) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (Brecciated/Recrystallized)

Calcium Carbonate (CaCO3)

Sandstone (Arenite (SiO2 based typically)) — sedimentary

Sandstone

Arenite (SiO2 based typically)

Sandstone (Quartz-rich) (Arenite (SiO2 based clastic rock)) — sedimentary

Sandstone (Quartz-rich)

Arenite (SiO2 based clastic rock)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Banded Chalcedony (Agate) in Basalt Matrix (Cryptocrystalline Quartz (SiO2) in Mafic Igneous Rock) — sedimentary/igneous

Banded Chalcedony (Agate) in Basalt Matrix

Cryptocrystalline Quartz (SiO2) in Mafic Igneous Rock

sedimentary/igneous

Stream-Rounded Shale or Mudstone (Argillaceous sedimentary rock) — sedimentary

Stream-Rounded Shale or Mudstone

Argillaceous sedimentary rock

Chert (with Manganese Dendrites) (Chert (Cryptocrystalline Quartz, SiO2)) — sedimentary

Chert (with Manganese Dendrites)

Chert (Cryptocrystalline Quartz, SiO2)

Shale (Argillaceous Rock) — sedimentary

Shale

Argillaceous Rock

Boxwork Siderite or Sepatarian Nodule Weathering (Siderite (FeCO3) with secondary mineralization or Boxwork Geode fragment) — sedimentary

Boxwork Siderite or Sepatarian Nodule Weathering

Siderite (FeCO3) with secondary mineralization or Boxwork Geode fragment

Limestone (River Pebble) (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone (River Pebble)

Sedimentary Calcium Carbonate (CaCO3)

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

Chert (Nodule)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Fossilized Brachiopod Shell (Phylum Brachiopoda (likely Order Spiriferida or Strophomenida)) — sedimentary

Fossilized Brachiopod Shell

Phylum Brachiopoda (likely Order Spiriferida or Strophomenida)

Stromatolite (Biogenic Sedimentary Rock (Lithified microbial mat)) — sedimentary

Stromatolite

Biogenic Sedimentary Rock (Lithified microbial mat)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Fossil Shark Tooth (embedded in matrix) (Lamniformes (likely Cretalamna or Squalicorax) within phosphatic/calcareous matrix) — sedimentary

Fossil Shark Tooth (embedded in matrix)

Lamniformes (likely Cretalamna or Squalicorax) within phosphatic/calcareous matrix

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

Chert (Nodule)

Silicon Dioxide (SiO2)

Ironstone Concretion (Iron-rich Mudstone) (Siderite / Geothite concretion (FeCO3 / FeO(OH))) — sedimentary

Ironstone Concretion (Iron-rich Mudstone)

Siderite / Geothite concretion (FeCO3 / FeO(OH))

Granitic Gneiss (Gneiss (Polymetamorphic Granitic Gneiss)) — metamorphic

Granitic Gneiss

Gneiss (Polymetamorphic Granitic Gneiss)

Sandstone (Sandstone (clastic sedimentary rock), primarily SiO2) — sedimentary

Sandstone

Sandstone (clastic sedimentary rock), primarily SiO2

Siltstone (Siltstone (primarily composed of SiO2, Al2O3, and phyllosilicates)) — sedimentary

Siltstone

Siltstone (primarily composed of SiO2, Al2O3, and phyllosilicates)

Sandstone (Arenite (composed primarily of Quartz: SiO2)) — sedimentary

Sandstone

Arenite (composed primarily of Quartz: SiO2)

Limestone (specifically Grainstone or Micrite) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (specifically Grainstone or Micrite)

Calcium Carbonate (CaCO3)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Siltstone (Siltstone (composed of clastic quartz and feldspar grains)) — sedimentary

Siltstone

Siltstone (composed of clastic quartz and feldspar grains)

Sandstone (Arenite (compositionally various, primarily SiO2)) — sedimentary

Sandstone

Arenite (compositionally various, primarily SiO2)

Travertine (Tufa) (Chemical Limestone (CaCO3)) — sedimentary

Travertine (Tufa)

Chemical Limestone (CaCO3)

Siltstone (Siltstone (fine-grained clastic sedimentary rock)) — sedimentary

Siltstone

Siltstone (fine-grained clastic sedimentary rock)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Shale (Fissile Mudstone (primarily composed of clay minerals and quartz)) — sedimentary

Shale

Fissile Mudstone (primarily composed of clay minerals and quartz)

Sandstone (likely Arkose or Lithic) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (likely Arkose or Lithic)

Clastic sedimentary rock (primarily SiO2)

Sandstone (Arenite (primarily Quartz-rich sedimentary rock)) — sedimentary

Sandstone

Arenite (primarily Quartz-rich sedimentary rock)

Siltstone (Siltstone) — sedimentary

Siltstone

Siltstone

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

Chert (Yellow Jasper/Flint)

Silicon Dioxide (SiO2)

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

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone (Graywacke) (Arenite / Graywacke (SiO2 with lithic fragments)) — sedimentary

Sandstone (Graywacke)

Arenite / Graywacke (SiO2 with lithic fragments)

Chert (Jasper influence) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper influence)

Microcrystalline Quartz (SiO2)

Shale (with Iron Oxide staining) (Fissile Mudstone (primarily Quartz and Clay minerals)) — sedimentary

Shale (with Iron Oxide staining)

Fissile Mudstone (primarily Quartz and Clay minerals)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)