Trilobite Fossil in Limestone
Trilobita (Class), likely embedded in fossiliferous limestone (CaCO3)
fossil
Category
Sedimentary (Fossilized Organic Remain)
Browse sedimentary (fossilized organic remain) specimens identified by the Rock Identifier community.
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Fossilized Shark Tooth in Matrix
Otodus sp. (likely Otodus obliquus)
sedimentary
Red Siltstone (or Red Shale)
Clastic Sedimentary Rock (Composition: primarily Quartz, Clay minerals, and Hematite Fe2O3)
sedimentary
Quartzite River Rock
Quartzite (SiO2)
metamorphic
Quartzite Pebble
Metamorphic rock primarily composed of Quartz (SiO2)
metamorphic
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Favosites (Honeycomb Coral Fossil)
Favosites (Genus of extinct tabulate coral)
sedimentary
Petoskey Stone
Hexagonaria percarinata
fossil
Sea Shell (Mollusk Shell)
Calcium Carbonate (Aragonite/Calcite)
fossil
Fossilized Crinoid Stem in Limestone
Crinoidea (Class) in Calcium Carbonate (CaCO3) matrix
fossil
Polished amber
Amber (fossilized plant resin; chiefly polymerized diterpenoid resin)
gemstone
Fossilized Bryozoan
Bryozoa
fossil
Fossilized Coral
Hexagonaria (Rugose coral) / Calcium Carbonate (CaCO3)
fossil
Fossilized Coral
Scleractinia (Agatized or Calcite replaced)
fossil
Fossilized Brachiopod
Brachiopoda (Phylum), likely Order Spiriferida or Rhynchonellida
fossil
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Slate
Slate (a fine-grained, foliated metamorphic rock). Mineral composition: Primarily composed of mica minerals (muscovite, chlorite, sericite) and quartz, with minor amounts of hematite, pyrite, and other accessory minerals.
sedimentary
Ammonite Fossil
Ammonoidea
fossil
Porphyritic Basalt
Porphyritic Aphanitic Basalt
igneous
Coral Fossil / Coral Fragment
Scleractinia / Calcium Carbonate (CaCO3)
fossil
Black Chert
Carbonaceous Chert (Silicon dioxide, SiO2)
sedimentary
Pyritic Shale
Carbonaceous Shale with Iron Pyrite (FeS2)
sedimentary
River Pebble (likely Quartzite or Quartz)
Quartzite (SiO2)
metamorphic
Amber and Jadeite Beads
Fossilized Tree Resin and Sodium Aluminum Silicate
gemstone
Fossilized Gastropod Internal Mold
Steinkern (Mollusca: Gastropoda)
sedimentary
Shiva Eye Shell Fossil (Operculum)
Turbo marmoratus (Operculum)
fossil
Honeycomb Coral Fossil (Petoskey-type Coral)
Favosites (Extinct Colonial Tabulate Coral), CaCO3
sedimentary
Fossilized Echinoid (Sea Urchin)
Echinoidea (Class)
sedimentary
Fossilized Angel Wing Shell
Cyrtopleura costata
sedimentary
Fossilized Brachiopod Shell in Matrix
Phylum Brachiopoda (typically Calcium Carbonate or Chitinophosphatic)
sedimentary
Fossilized Sea Urchin (Echinoid)
Echinoidea (Fossil specimen, often replaced by Calcite or Silica)
sedimentary
Fossilized Favosites (Honeycomb Coral)
Favosites (Genus), Phylum Cnidaria, Class Anthozoa
sedimentary
Coquina or Fossilized Shell Aggregate
Calcareous bioclastic sedimentary rock (CaCO3)
sedimentary
Fossilized Favosites (Honeycomb Coral)
Favosites (extinct genus of tabulate coral)
sedimentary
Sedimentary Rock (Limestone or Siltstone pebble)
Sedimentary rock fragment
sedimentary
Megalodon Shark Tooth
Otodus megalodon
fossil
Fossilized Sea Urchin Spines
Echinoidea (Cidaroid spines)
sedimentary
Fossilized Favosites (Honeycomb Coral)
Favosites (extinct genus of tabulate coral)
sedimentary
Fossilized Gastropod in Chert/Limestone
Internal mold of Gastropoda (Class) with CaCO3 or SiO2 mineral formula
sedimentary
Fossilized Solitary Rugose Coral
Order Rugosa (commonly Horn Coral)
sedimentary