Fossilized bivalve shell
Fossil mollusk, likely an oyster or similar cemented bivalve; original shell mostly calcite (CaCO₃)
fossil
Category
Sedimentary (Fossilized)
Browse sedimentary (fossilized) specimens identified by the Rock Identifier community.
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Fossilized Oyster Shell
Gryphaea or Exogyra (Family Ostreidae)
fossil
Polished fossil ammonite
Ammonite cephalopod fossil, likely an ammonite mold/cast in calcite or aragonite-derived mineralization
fossil
Amber
Succinite (a specific high-quality amber from the Baltic)
Organic Mineraloid
Sandstone (Flagstone)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite (SiO2 with various cementation agents)
sedimentary
Sandstone with Dendritic Manganese Oxides
Sandstone (SiO2 predominant) with Oxide Dendrites (MnO2)
sedimentary
Dendritic Chert
Silicon Dioxide with Manganese Oxide Inclusions (SiO2 + MnO2)
sedimentary
Septarian Nodule
Septarian Concretion (Composition: Calcite, Aragonite, and Limestone/Clay)
sedimentary
Orbicular Jasper (Eye Jasper / Kambaba-like pattern)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Tree Agate
Silicon Dioxide (SiO2) - Dendritic Agate/Chalcedony
sedimentary
Sandstone Concretion
Sandstone (Sedimentary Rock) with silica or calcite cement
sedimentary
Chert Nodules or Concretion
Cryptocrystalline Quartz (SiO2)
sedimentary
![Fossilized mammalian tooth (Mineralized dental tissue, chiefly hydroxyapatite [Ca₅(PO₄)₃(OH)]) — fossil](https://media.rock.id/fossilized-mammalian-tooth-17c16ac3-d390-40e9-add9-0fd9ad647148-thumbnail.jpg)
Fossilized mammalian tooth
Mineralized dental tissue, chiefly hydroxyapatite [Ca₅(PO₄)₃(OH)]
fossil
Bivalve Fossil (Clam)
Class Bivalvia (e.g., Mercenaria or similar genus)
fossil
Calligraphy Stone
Fossiliferous Stromatolite Limestone (also known as Arabic Script Stone, Miriam Stone, or Elephant Skin Jasper)
sedimentary
Mookaite Jasper
Silicified Radiolarite (SiO2)
sedimentary
Crinoidal Limestone
Bioclastic Limestone
Sedimentary
Fossil coral or shell fragment
Indeterminate calcareous fossil; likely aragonite or calcite (CaCO₃)
fossil
Crinoid Stem Fossil in Matrix
Phylum Echinodermata, Class Crinoidea
fossil
Sandstone
Arenite (primarily SiO2)
sedimentary
Fossilized sea urchin
Echinoid fossil; commonly Cidaroida or related echinoid
fossil
Tumbled amber-colored mineral or glassy pebble
Uncertain; likely chalcedony/quartz, possibly resinous amber or slag glass
mineral
Amber (Cherry Amber)
Succinite (C10H16O)
Organic Gemstone
Baltic Amber
Succinite (Polmerized conifer resin)
mineraloid
Fossilized Gastropod Shell
Gastropoda (Fossilized internal mold or shell body)
fossil
Orthoceras Fossil in Limestone
Orthoceras (extinct genus of cephalopods) in Carboniferous or Devonian Limestone
sedimentary
Jet
Lignite (Anthracite-grade compact coal)
sedimentary
Lepidodendron Fossil (Scale Tree)
Lepidodendron
fossil
Fossiliferous limestone
Bioclastic micrite/wackestone, likely containing crinoid or shell fragments
sedimentary
Septarian Nodule
Septarian Concretion (Calcite, Aragonite, and Limestone)
sedimentary
Sandstone with attached barnacles
Quartz sandstone (Silicon Dioxide - SiO2 matrix)
sedimentary
Sandstone Cobble
Arenite (primarily SiO2)
sedimentary
Sandstone Pebble (River Rock)
Arenite (primarily SiO2)
sedimentary
Sandstone with Vitrinite/Coal inclusions
Arenite with Carbonaceous inclusions
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Dendritic Jasper (River Stone)
Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions
sedimentary
Fossilized bone fragment
Mineralized vertebrate bone, commonly hydroxyapatite partly replaced by silica or calcite
fossil
Mookaite Jasper
Radiolarite (Silica with iron oxides like Goethite and Hematite)
sedimentary
Mookaite Jasper
Silicon Dioxide (SiO2) - variety of Chert/Jasper
sedimentary
Fossilized Rugose Coral (Horn Coral)
Order Rugosa
sedimentary
Mookaite Jasper
Silicified Radiolarite (SiO2)
sedimentary