Rock Identifier

Category

Igneous And Fossil

Browse igneous and fossil specimens identified by the Rock Identifier community.

Learn about Igneous And Fossil in the encyclopedia

Fossil Opal

Bone Opal

Turritella Jasper

Amber

Fossiliferous Limestone

Fossiliferous Limestone

Turritella Agate

Turritella Agate

Petrified Wood

Carbonatite

Diatomite

Guano

Jet

Diatomaceous Earth

Petrified Wood (Silicified Wood (SiO2)) — mineral

Petrified Wood

Silicified Wood (SiO2)

Ironstone Concretion (Ironstone (primarily Siderite or Limonite)) — sedimentary

Ironstone Concretion

Ironstone (primarily Siderite or Limonite)

Bivalve Fossil (Cockle shell) (Class Bivalvia (e.g., Anadara or Veneridae family)) — fossil

Bivalve Fossil (Cockle shell)

Class Bivalvia (e.g., Anadara or Veneridae family)

Orthoceras Fossil (Orthoceras regulare) — fossil

Orthoceras Fossil

Orthoceras regulare

Chert (with possible fossils) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (with possible fossils)

Microcrystalline quartz (SiO2)

Fossil Coral (Anthozoa (Scleractinia)) — fossil

Fossil Coral

Anthozoa (Scleractinia)

Coral Fossil (Scleractinia (Class Anthozoa)) — fossil

Coral Fossil

Scleractinia (Class Anthozoa)

Brachiopod Fossil (Phylum Brachiopoda (poss. Order Spiriferida or Rhynchonellida)) — fossil

Brachiopod Fossil

Phylum Brachiopoda (poss. Order Spiriferida or Rhynchonellida)

Ammonite Fossil (Ammonoidea (subclass)) — fossil

Ammonite Fossil

Ammonoidea (subclass)

Gastropod Fossil (Phylum Mollusca, Class Gastropoda) — fossil

Gastropod Fossil

Phylum Mollusca, Class Gastropoda

Brachiopod Fossil (Brachiopoda (Phylum); often Atrypa or Mucrospirifer genus depending on locality) — fossil

Brachiopod Fossil

Brachiopoda (Phylum); often Atrypa or Mucrospirifer genus depending on locality

Coral Fossil (Anthozoa (Scleractinia)) — fossil

Coral Fossil

Anthozoa (Scleractinia)

Calamites fossil (Calamites (extinct genus of arborescent horsetails)) — fossil

Calamites fossil

Calamites (extinct genus of arborescent horsetails)

Fossil Coral (Tabulate Coral (potentially Favosites or Calapoecia)) — fossil

Fossil Coral

Tabulate Coral (potentially Favosites or Calapoecia)

Calamites (Calamites (Pith cast fossil)) — sedimentary

Calamites

Calamites (Pith cast fossil)

Coal (Anthracite or Bituminous) (Carbon (C) with varying hydrocarbon and mineral impurities) — sedimentary

Coal (Anthracite or Bituminous)

Carbon (C) with varying hydrocarbon and mineral impurities

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Crinoid Stem Segment Fossil (Crinoidea (columnal ossicle)) — fossil

Crinoid Stem Segment Fossil

Crinoidea (columnal ossicle)

Crinoidean Fossil (Stem Fragment) (Phylum Echinodermata, Class Crinoidea) — fossil

Crinoidean Fossil (Stem Fragment)

Phylum Echinodermata, Class Crinoidea

Murex Fossil (Muricidae (Calcium Carbonate fossilization)) — fossil

Murex Fossil

Muricidae (Calcium Carbonate fossilization)

Fossil Coral (Scleractinia (fossilized calcium carbonate)) — sedimentary

Fossil Coral

Scleractinia (fossilized calcium carbonate)

Ammonite Fossil (Ammonoidea (primarily composed of Calcite, CaCO3)) — sedimentary

Ammonite Fossil

Ammonoidea (primarily composed of Calcite, CaCO3)

Ammonite Fossil (Ammonoidea (subclass)) — sedimentary

Ammonite Fossil

Ammonoidea (subclass)

Ammonite Fossil (Ammonoidea (Calcium carbonate or Pyrite replacement)) — sedimentary

Ammonite Fossil

Ammonoidea (Calcium carbonate or Pyrite replacement)

Ammonite Fossil (Ammonoidea (subclass)) — sedimentary

Ammonite Fossil

Ammonoidea (subclass)

Ammonite Fossil (Ammonoidea (Calcium carbonate or Pyrite replaced)) — sedimentary

Ammonite Fossil

Ammonoidea (Calcium carbonate or Pyrite replaced)

Belemnite Fossil (Belemnitida (Order within Cephalopoda)) — sedimentary

Belemnite Fossil

Belemnitida (Order within Cephalopoda)

Fossil Coral (Scleractinia (fossil order), primarily Calcium Carbonate (CaCO3)) — sedimentary

Fossil Coral

Scleractinia (fossil order), primarily Calcium Carbonate (CaCO3)

Trilobite Fossil (Trilobita (Class), likely Phacopid or Asaphid order) — sedimentary

Trilobite Fossil

Trilobita (Class), likely Phacopid or Asaphid order

Ammonite Fossil (Ammonoidea (typically preserved as Calcite or Aragonite)) — sedimentary

Ammonite Fossil

Ammonoidea (typically preserved as Calcite or Aragonite)

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

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

Petrified Wood

Silicified Wood (primarily SiO2)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Sandstone Cobble (Arenite (predominantly Quartz Sandstone)) — sedimentary

Sandstone Cobble

Arenite (predominantly Quartz Sandstone)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

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

Petrified Wood

Silicified Wood (primarily Chalcedony or Quartz, SiO2)

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

Sandstone (Quartzose)

Arenite (SiO2 based)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

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

Petrified Wood

Silicified Wood (primarily Chalcedony/Quartz, SiO2)

Fossilized Shark Tooth (Elasmobranchii (various species, possibly Carcharias or Odontaspis)) — fossil

Fossilized Shark Tooth

Elasmobranchii (various species, possibly Carcharias or Odontaspis)

Fossilized Solitary Rugose Coral (Horn Coral) (Rugosa (Order Rugosa)) — fossil

Fossilized Solitary Rugose Coral (Horn Coral)

Rugosa (Order Rugosa)