Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Category
Mineral (Biogenic Replacement)
Browse mineral (biogenic replacement) specimens identified by the Rock Identifier community.
Tahitian Black Pearl
Biogenic Calcium Carbonate (Aragonite/Conchiolin Mixture), CaCO3
mineral
Flint (Chert Flake / Drill Tool)
SiO2 (Microcrystalline Quartz)
sedimentary
Chert Nodules
Microcrystalline Quartz (SiO2)
sedimentary
Pyrite (Fool's Gold) in Matrix
Iron Disulfide (FeS2)
mineral
Brachiopod Fossil
Phylum Brachiopoda
fossil
Kidney Stone (Medical Specimen)
Calcium oxalate monohydrate (Whewellite) / CaC2O4·H2O
Mineral (Biogenic)
Fossilized Syringopora (Piping Organ Coral)
Syringopora (Extinct Genus of Tabulate Coral)
sedimentary
Megalodon Shark Tooth
Otodus megalodon
fossil
Chert / Chalcedony Blend
Microcrystalline Quartz (SiO2)
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Fossil Shell
Brachiopod or Mollusk fossil
fossil
Chert (Black Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Ferruginous Sandstone (Gozzanous)
SiO2 (Quartz) with FeO(OH) (Goethite) or Fe2O3 (Hematite) coating
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Galena
Lead(II) sulfide (PbS)
mineral
Brachiopod Fossil in Matrix
Phylum Brachiopoda
fossil
Fossilized Shark Teeth
Carcharhiniformes or Lamniformes species (common mineral: Fluorapatite/Ca5(PO4)3F)
sedimentary (fossilized organic matter)
Fossilized coral or carbonate fossil fragment
Calcareous fossil, likely colonial coral (order Hexacorallia; uncertain from image)
fossil
Fluorite
Calcium Fluoride (CaF2)
mineral
Banded Flint (Chert)
Silicon Dioxide (SiO2)
sedimentary
Fossil Bone Fragment
Petrified bone (permineralized hydroxyapatite)
fossil
Otodus Shark Tooth
Otodus obliquus
fossil
Shark Tooth Fossil
Elasmobranchii dentition (fossilized)
fossil
Fossil Shark Tooth
Chondrichthyes (Class)
fossil
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Tiger's Eye (Rough)
Pseudomorph of Quartz after Crocidolite (SiO2 with FeOOH inclusions)
metamorphic
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Fossilized Bone
Petrified Bone (Fluorapatite / Calcium Phosphate replacement)
fossil
Chert (with potential fossil inclusion)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Gastropod Shell
Gastropoda (Class) replacement / internal cast (steinkern)
fossil
Fossilized Bone Chunk
Permineralized Vertebrate Bone (indeterminant)
fossil
Shark Tooth Fossil
Otodus obliquus (or similar prehistoric lamniform shark tooth)
fossil
Fossil Shark Tooth
Chondrichthyes (class)
fossil
Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz (Jasper / Chert)
Silicon Dioxide (SiO2)
sedimentary
Rainbow Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Lepidodendron Fossil (Scale Tree)
Lepidodendron sp.
fossil
Petoskey Stone
Hexagonaria percarinata
fossil