Mosasaur Tooth Fossil
Mosasaurus sp.
fossil
Category
Organic Gemstone (Fossilized Resin)
Browse organic gemstone (fossilized resin) specimens identified by the Rock Identifier community.
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Fossiliferous Limestone
Calcium Carbonate (CaCO3) with marine fossils
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossilized Shark Tooth
Carcharocles or Otodus sp. (Micro-fossilized)
sedimentary
Fossilized Shark Tooth (Carcharocles/Otodus or Sand Tiger Shark Tooth)
Elasmobranchii (Fossilized Tooth)
fossil
Fossilized Bark
Lepidodendron / Sigillaria fossil impression
fossil
Fossil-bearing sedimentary rock, possibly fossil wood or bone
Indeterminate silicified/carbonate fossil in sandstone or mudstone
fossil
Polished fossil bone fragment
Fossilized bone, likely mammalian or reptilian; exact taxon cannot be determined from the image
fossil
Petrified Palmwood
Palmoxylon (fossilized monocot xylem)
sedimentary
Fossilized Tooth Fragment
Vertebrate Fossil (Mammalia indet.)
fossil
Shark Tooth Fossil
Carcharodonta (order Lamniformes), likely Carcharias spp.
fossil
Chert (Green Fossilized Algae or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Ironstone Concretion (Limonite/Goethite)
Iron oxide concretion (contains FeO(OH)·nH2O)
sedimentary
Oyster Shell Fragment
Crassostrea virginica (or related Bivalvia)
fossil
Chalcedony in Matrix (likely Agatized Coral or Chert)
Silicon Dioxide (SiO2)
sedimentary
Shark Tooth Fossil
Chondrichthyes (class) fossilized tooth
fossil
Fossilized Horse Tooth
Equus sp. (fossilized molar)
fossil
Fossilized Shark Tooth
Chondrichthyes (class) fossilized tooth
fossil
Fossilized Bone / Dinosaur Fossil
Fossilized vertebrate bone (permineralized)
fossil
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Petrified Bone (Fossil Bone)
Per mineralization fossil bone (varies by organism, predominantly replacement by SiO2 - Quartz/Chalcedony)
fossil
Petrified Wood
Fossilized Wood (silicified wood)
fossil
Fossil Shark Tooth
Chondrichthyes tooth fossil
fossil
Fossilized Brachiopod
Brachiopoda (e.g., Atrypa or Rhynchonellida)
fossil
Fossilized bone fragment
Fossil bone, composed chiefly of carbonate-fluorapatite (bioapatite)
fossil
Fossil Shark Tooth
Carcharodon sp. (likely Otodus or similar Lamniformes order)
sedimentary
Jasper containing fossilized inclusions
Silicon Dioxide (SiO2) with trace impurities and biogenic inclusions
sedimentary
Polished petrified wood
Silicified fossil wood, chiefly microcrystalline quartz (SiO₂)
fossil
Petrified Wood / Fossilized Bone
Silicified / Mineralized Fossil (Silica SiO2)
fossil
Fossilized Shark Teeth
Otodus sp. (Eocene Sand Tiger/Mackerel Shark)
fossil
Dendritic Limestone
Calcite with Manganese Oxide (Manganese Dendrites)
sedimentary
Fossilized Horn Coral
Order Rugosa (Rugose Coral)
sedimentary
Tree Agate
Silicon Dioxide (SiO2) with Dendritic Inclusions
Mineral
Chert Nodules or Concretion
Cryptocrystalline Quartz (SiO2)
sedimentary
Sand Tiger Shark Tooth Fossil
Carcharias taurus (fossilized tooth)
fossil
Chert (Fossiliferous)
Silicon dioxide (SiO2)
sedimentary
Fossilized Shell in Limestone
Bivalve fossil (CaCO3) in Carbonate Sedimentary Rock
sedimentary
Coral Fossil (Hexagonaria)
Hexagonaria sp. (Silica-replaced)
fossil
Sandstone (with potential fossil inclusions)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Fossilized Rugose Coral (Horn Coral)
Order Rugosa
sedimentary
Yellow cabochon gemstone, likely citrine or yellow glass imitation
Quartz (SiO₂), if natural citrine; visual evidence is insufficient to exclude man-made glass or resin
gemstone
Fossil Shark Tooth
Elasmobranchii tooth fossil (e.g., Otodus / Carcharocles)
fossil