Rock Identifier

Category

Sedimentary (Fossilized Organic Remain)

Browse sedimentary (fossilized organic remain) specimens identified by the Rock Identifier community.

Smoky Quartz (Apache Tear Variety) (Silicon dioxide (SiO2) - Volcanic Glass) — igneous

Smoky Quartz (Apache Tear Variety)

Silicon dioxide (SiO2) - Volcanic Glass

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

Coral Fossil (Favosites) (Favosites (Calcite/Calcium Carbonate, CaCO3)) — sedimentary

Coral Fossil (Favosites)

Favosites (Calcite/Calcium Carbonate, CaCO3)

Fossil Coral (Petoskey Stone / Rugose Coral) (Hexagonaria percarinata (Order: Rugosa, Fossilized Calcium Carbonate CaCO3)) — sedimentary

Fossil Coral (Petoskey Stone / Rugose Coral)

Hexagonaria percarinata (Order: Rugosa, Fossilized Calcium Carbonate CaCO3)

Crinoid Marble (Fossilized Limestone) (Crinoidal Limestone (comprising Calcite/Aragonite CaCO3)) — sedimentary

Crinoid Marble (Fossilized Limestone)

Crinoidal Limestone (comprising Calcite/Aragonite CaCO3)

Fossilized Echinoid (Sea Urchin) (Echinoidea (Class), often found as calcitic fossils) — sedimentary

Fossilized Echinoid (Sea Urchin)

Echinoidea (Class), often found as calcitic fossils

Quartzite Pebble (Quartzite (primarily SiO2)) — metamorphic

Quartzite Pebble

Quartzite (primarily SiO2)

Sandstone (Sandstone (various mineral compositions)) — Sedimentary

Sandstone

Sandstone (various mineral compositions)

Quartzite River Stone (Quartzite (primarily SiO2)) — metamorphic

Quartzite River Stone

Quartzite (primarily SiO2)

Fossil Sand Dollar (Echinoidea) (Phylum Echinodermata, Class Echinoidea (likely Dendraster or Scutella)) — sedimentary

Fossil Sand Dollar (Echinoidea)

Phylum Echinodermata, Class Echinoidea (likely Dendraster or Scutella)

Amber (Succinite (C10H16O)) — mineraloid

Amber

Succinite (C10H16O)

Fossilized Shark Tooth in Matrix (Otodus sp. (likely Otodus obliquus)) — sedimentary

Fossilized Shark Tooth in Matrix

Otodus sp. (likely Otodus obliquus)

Fossilized Sea Urchin (Echinoid) (Echinoidea (Fossil specimen, often replaced by Calcite or Silica)) — sedimentary

Fossilized Sea Urchin (Echinoid)

Echinoidea (Fossil specimen, often replaced by Calcite or Silica)

Ironstone concretion / Limonitic Sandstone (Goethite/Hematite Cemented Sandstone (Hydrated Iron Oxide)) — sedimentary

Ironstone concretion / Limonitic Sandstone

Goethite/Hematite Cemented Sandstone (Hydrated Iron Oxide)

Amethyst (Silicon Dioxide with Iron impurities (SiO2)) — mineral

Amethyst

Silicon Dioxide with Iron impurities (SiO2)

Milky Quartz with Dendritic Inclusions (Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions) — mineral

Milky Quartz with Dendritic Inclusions

Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions

Fossilized Angel Wing Shell (Cyrtopleura costata) — sedimentary

Fossilized Angel Wing Shell

Cyrtopleura costata

Fossilized Brachiopod Shell in Matrix (Phylum Brachiopoda (typically Calcium Carbonate or Chitinophosphatic)) — sedimentary

Fossilized Brachiopod Shell in Matrix

Phylum Brachiopoda (typically Calcium Carbonate or Chitinophosphatic)

Fossilized Favosites (Honeycomb Coral) (Favosites (Genus), Phylum Cnidaria, Class Anthozoa) — sedimentary

Fossilized Favosites (Honeycomb Coral)

Favosites (Genus), Phylum Cnidaria, Class Anthozoa

Coquina or Fossilized Shell Aggregate (Calcareous bioclastic sedimentary rock (CaCO3)) — sedimentary

Coquina or Fossilized Shell Aggregate

Calcareous bioclastic sedimentary rock (CaCO3)

Mica (specimen appears to be Muscovite or Phlogopite) (Phyllosilicate mineral; Muscovite: KAl2(AlSi3O10)(F,OH)2) — Mineral (Found in Igneous and Metamorphic rocks)

Mica (specimen appears to be Muscovite or Phlogopite)

Phyllosilicate mineral; Muscovite: KAl2(AlSi3O10)(F,OH)2

Mineral (Found in Igneous and Metamorphic rocks)

Quartzite Pebble (Metamorphosed Quartz Sandstone (SiO2)) — metamorphic

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Favosites (Honeycomb Coral Fossil) (Favosites (Genus of extinct tabulate coral)) — sedimentary

Favosites (Honeycomb Coral Fossil)

Favosites (Genus of extinct tabulate coral)

Porphyry (Porphyritic Andesite/Basalt) — igneous

Porphyry

Porphyritic Andesite/Basalt

Fulgurite (Fulgurite (Lechatelierite), amorphous SiO2) — metamorphic

Fulgurite

Fulgurite (Lechatelierite), amorphous SiO2

Honeycomb Coral Fossil (Petoskey-type Coral) (Favosites (Extinct Colonial Tabulate Coral), CaCO3) — sedimentary

Honeycomb Coral Fossil (Petoskey-type Coral)

Favosites (Extinct Colonial Tabulate Coral), CaCO3

Fossiliferous Sandstone (with Brachiopod or Bivalve mold) (Clastic Sedimentary Rock with Macrofossil Mold) — sedimentary

Fossiliferous Sandstone (with Brachiopod or Bivalve mold)

Clastic Sedimentary Rock with Macrofossil Mold

Quartzite Cobble (Quartzite (SiO2)) — metamorphic

Quartzite Cobble

Quartzite (SiO2)

Fossilized Coral (Petoskey Stone / Favosites) (Favosites (extinct genus of tabulate coral)) — sedimentary

Fossilized Coral (Petoskey Stone / Favosites)

Favosites (extinct genus of tabulate coral)

Gastropod Steinkern (Fossilized Snail Cast) (Phylum Mollusca, Class Gastropoda (Commonly CaCO3 or SiO2 after replacement)) — Sedimentary

Gastropod Steinkern (Fossilized Snail Cast)

Phylum Mollusca, Class Gastropoda (Commonly CaCO3 or SiO2 after replacement)

Fossilized Favosites (Honeycomb Coral) (Favosites (extinct genus of tabulate coral)) — sedimentary

Fossilized Favosites (Honeycomb Coral)

Favosites (extinct genus of tabulate coral)

Fossilized Gastropod in Chert/Limestone (Internal mold of Gastropoda (Class) with CaCO3 or SiO2 mineral formula) — sedimentary

Fossilized Gastropod in Chert/Limestone

Internal mold of Gastropoda (Class) with CaCO3 or SiO2 mineral formula

Fossilized Solitary Rugose Coral (Order Rugosa (commonly Horn Coral)) — sedimentary

Fossilized Solitary Rugose Coral

Order Rugosa (commonly Horn Coral)

Fossilized Stingray Mouth Plate (Myliobatidae dental battery) — sedimentary

Fossilized Stingray Mouth Plate

Myliobatidae dental battery

Fossilized Coral (Honeycomb Coral) (Favosites (extinct genus of tabulate corals), CaCO3 (Calcium Carbonate)) — sedimentary

Fossilized Coral (Honeycomb Coral)

Favosites (extinct genus of tabulate corals), CaCO3 (Calcium Carbonate)

Crinaudite / Fossilized Crinoid Stem (Crinoid (Echinodermata) in a Calcitic/Siliceous Matrix) — sedimentary

Crinaudite / Fossilized Crinoid Stem

Crinoid (Echinodermata) in a Calcitic/Siliceous Matrix

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)

Quartzite Pebble (River Rock) (Quartzite (primarily SiO2)) — metamorphic

Quartzite Pebble (River Rock)

Quartzite (primarily SiO2)

Clear Quartz (Rock Crystal) (Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Tiger's Eye (Titanium-containing Quartz (Silica: SiO2)) — Mineral

Tiger's Eye

Titanium-containing Quartz (Silica: SiO2)

Fossilized Sea Urchin (Echinoid) (Echinoidea (Class); commonly Clypeasteroida for sand dollar types) — sedimentary (fossil)

Fossilized Sea Urchin (Echinoid)

Echinoidea (Class); commonly Clypeasteroida for sand dollar types

sedimentary (fossil)

Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)