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

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Fossiliferous Limestone with Rugose Coral (Calcite (CaCO3) containing a Rugosa (Horn Coral) fossil) — sedimentary

Fossiliferous Limestone with Rugose Coral

Calcite (CaCO3) containing a Rugosa (Horn Coral) fossil

Fossilized Shark Tooth (Cretaceous to Neogene) (Elasmobranchii dental fossil (likely Squalicorax or similar species)) — mineral (biogenic replacement)

Fossilized Shark Tooth (Cretaceous to Neogene)

Elasmobranchii dental fossil (likely Squalicorax or similar species)

mineral (biogenic replacement)

Coquina or Fossiliferous Limestone (Fossiliferous Calcarenite (CaCO3)) — sedimentary

Coquina or Fossiliferous Limestone

Fossiliferous Calcarenite (CaCO3)

Coquina (Biogenic Limestone (Calcite, CaCO3)) — sedimentary

Coquina

Biogenic Limestone (Calcite, CaCO3)

Chert (Yellow or Tan variety) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Yellow or Tan variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Sandstone with Foliose Lichen (Arenite (Rock matrix) with Xanthoparmelia or Flavoparmelia (Lichen genus)) — sedimentary

Sandstone with Foliose Lichen

Arenite (Rock matrix) with Xanthoparmelia or Flavoparmelia (Lichen genus)

Shale (Shale (Argillaceous sedimentary rock)) — sedimentary

Shale

Shale (Argillaceous sedimentary rock)

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

Chert (Nodule)

Silicon Dioxide (SiO2)

Shale with Siltstone layering (Sedimentary Clastic Rock (Mudstone/Shale)) — sedimentary

Shale with Siltstone layering

Sedimentary Clastic Rock (Mudstone/Shale)

Chert (Field Stone) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Field Stone)

Microcrystalline Quartz (SiO2)

Ferruginous Sandstone (Sandstone with iron oxide (Hematite/Limonite) cement) — sedimentary

Ferruginous Sandstone

Sandstone with iron oxide (Hematite/Limonite) cement

Queen Conch Shell (Biogenic Calcium Carbonate) (Aliger gigas (synonym Strombus gigas); Composition: Aragonite (CaCO3)) — mineral

Queen Conch Shell (Biogenic Calcium Carbonate)

Aliger gigas (synonym Strombus gigas); Composition: Aragonite (CaCO3)

Piddock bored rock (Boring Stone) (Ichnofossil-bearing Limestone or Mudstone (trace fossils by Pholadidae)) — sedimentary

Piddock bored rock (Boring Stone)

Ichnofossil-bearing Limestone or Mudstone (trace fossils by Pholadidae)

Iron Concretion (Ferruginous concretion (Fe2O3·nH2O / FeO(OH))) — sedimentary

Iron Concretion

Ferruginous concretion (Fe2O3·nH2O / FeO(OH))

Liesegang Rings (in Sandstone or Siltstone) (Ferruginous Sandstone with Liesegang Banding) — sedimentary

Liesegang Rings (in Sandstone or Siltstone)

Ferruginous Sandstone with Liesegang Banding

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

Limestone (Beach Pebble)

Sedimentary Calcium Carbonate (CaCO3)

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

Sandstone

Arenite (composed primarily of SiO2)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Yellow Jasper with Dendritic Inclusions (Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions) — sedimentary

Yellow Jasper with Dendritic Inclusions

Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions

Ironstone Concretion (Siderite or Goethite Concretion) — sedimentary

Ironstone Concretion

Siderite or Goethite Concretion

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

Sandstone (Quartzose Sandstone Pebble)

Arenite (primarily SiO2)

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Limestone (Calcareous sedimentary rock (CaCO3)) — sedimentary

Limestone

Calcareous sedimentary rock (CaCO3)

Sandstone (with potential iron mineralization) (Arenite) — sedimentary

Sandstone (with potential iron mineralization)

Arenite

Favosites Fossil (Honeycomb Coral) (Favosites (Order Favositida)) — sedimentary

Favosites Fossil (Honeycomb Coral)

Favosites (Order Favositida)

Sandstone (Arenite (lithic or quartz sandstone)) — sedimentary

Sandstone

Arenite (lithic or quartz sandstone)

Limonite Concretion (Limonite (Hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)) — sedimentary

Limonite Concretion

Limonite (Hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)

Limestone with Calcite Veins (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone with Calcite Veins

Sedimentary Calcium Carbonate (CaCO3)

Crushed Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Crushed Limestone

Calcium Carbonate (CaCO3)

Shale (Argillaceous Sedimentary Rock) — sedimentary

Shale

Argillaceous Sedimentary Rock

Sandstone (Arenite (SiO2 based with mineral cement)) — sedimentary

Sandstone

Arenite (SiO2 based with mineral cement)

Limestone (Weathered) (Sedimentary Carbonate Rock (CaCO3)) — sedimentary

Limestone (Weathered)

Sedimentary Carbonate Rock (CaCO3)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Limestone (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Sandstone (Quartzite-rich) (Clastic sedimentary rock (SiO2 primarily)) — sedimentary

Sandstone (Quartzite-rich)

Clastic sedimentary rock (SiO2 primarily)

Limestone (specifically Travertine or Tufa) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (specifically Travertine or Tufa)

Calcium Carbonate (CaCO3)

Limestone (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Sandstone (likely with Borings or Vesicular Basalt) (Clastic Sedimentary Rock (Sandstone)) — sedimentary

Sandstone (likely with Borings or Vesicular Basalt)

Clastic Sedimentary Rock (Sandstone)

Sandstone (Ferruginous) (Arenite with Iron-oxide inclusions (SiO2 primarily)) — sedimentary

Sandstone (Ferruginous)

Arenite with Iron-oxide inclusions (SiO2 primarily)

Siltstone (Siltstone (SiO2, Fe2O3, Al2O3 mix)) — sedimentary

Siltstone

Siltstone (SiO2, Fe2O3, Al2O3 mix)