Chert (Beach Pebble)
Silicon Dioxide (SiO2)
sedimentary
Category
Mineralized Fossil
Browse mineralized fossil specimens identified by the Rock Identifier community.
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Coal
Bituminous or Anthracite coal (carbon-rich sedimentary rock)
sedimentary
Coral Fossil (Agatized Coral or Petoskey Stone)
Hexagonaria percarinata (if Petoskey) or generally Scleractinia (Agatized Coral)
Sedimentary/Fossil
Coal (Anthracite or Bituminous)
Lithified plant matter (Carbon)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Gastropod Fossil (Internal Mold)
Phylum Mollusca, Class Gastropoda (Steinkern)
sedimentary
Sandstone with Dendritic Manganese Oxides
Sandstone (SiO2 predominant) with Oxide Dendrites (MnO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossiliferous Limestone (Hash)
Bioclastic Grainstone / Calcarenite
fossil
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Fossiliferous Limestone
Biomicrite / Limestone with fossils
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
mineral
Petrified Wood
Silicified wood (primarily SiO2 - Silicon Dioxide)
mineral
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Organic Inclusions
fossil
Ironstone (likely siderite or goethite-rich siltstone)
Ferruginous Siltstone
sedimentary
Sandstone (with carbonaceous plant fragments)
Arenite (composed primarily of SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossiliferous Limestone (Coquina / Shell Limestone)
Bioclastic Limestone (CaCO3)
sedimentary
Tumbled tree agate (dendritic agate)
Cryptocrystalline quartz, SiO₂, with manganese/iron-oxide dendrites
mineral
Petrified Wood
Silicified Wood / Chalcedony (SiO2)
mineral
Dendritic Agate
Chalcedony (SiO2) with manganese/iron oxide inclusions
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Chert Conglomerate (or Breccia)
Sedimentary Clastic Rock (variety: Ferruginous Chert Breccia)
sedimentary
Sandstone Concretion
Clastic Sedimentary Concretion (primarily SiO2 with Fe2O3 cement)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone
Arenite (often composed of Quartz, SiO2)
sedimentary
Sandstone with Iron Staining
Arenite (SiO2 based with Fe2O3 staining)
sedimentary
Sandstone (with Iron Staining)
Arenite (SiO2 predominantly)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Shark Tooth Fossil
Lamniformes (Shark tooth fossil composed of Fluorapatite)
fossil
Sandstone (likely with Borings or Vesicular Basalt)
Clastic Sedimentary Rock (Sandstone)
sedimentary
Liesegang Rings (in Sandstone or Siltstone)
Ferruginous Sandstone with Liesegang Banding
sedimentary
Fossiliferous Limestone / Fossil Fragment
Calcium Carbonate Matrix with Biogenic Inclusions (CaCO3)
fossil
Orthoceras Fossil in Limestone
Orthoceras regulare (Class Cephalopoda)
fossil
Fossiliferous Limestone (Crinoid stem fossils)
Sedimentary Limestone with Crinoidea ossicles
fossil
Ammonite Fossil (Small Pyritized or Calcitized Internal Mold)
Ammonoidea
sedimentary
Amber
Succinite / Fossilized Tree Resin
fossil
Dinosaur Bone (Petrified/Agatized)
Permineralized Dinosauria Bone (Silicate Replacement)
fossil
Shale
Fissile mudstone (primarily clay minerals and silt-sized quartz)
sedimentary
Fossilized Bone
Vertebrate Fossil Fragment (Calcium Phosphate / Hydroxyapatite)
fossil