Shark Tooth Fossil
Vertebrate fossilized tooth (Chondrichthyes)
fossil
Category
Sedimentary (With Some Aspects Of Mineral Replacement)
Browse sedimentary (with some aspects of mineral replacement) specimens identified by the Rock Identifier community.
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Chert (Flint nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Fossilized Echinoid (Sea Urchin)
Echinoidea (Class) - Often found as Micraster or Clypeaster specimens
sedimentary
Pyrite
Iron sulfide (FeS2)
mineral
Galena
Galena (lead sulfide, PbS)
mineral
Chert / Chalcedony Nodules
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Yellow Jasper variant)
Silicon Dioxide (SiO2)
sedimentary
Fossil Coral
Scleractinia (Fossilized Coral) / Calcium Carbonate (CaCO3) or Silica (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chalcedony (Botryoidal)
Silicon Dioxide (SiO2)
mineral
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Bivalve Fossil (Clam)
Class Bivalvia (Calcium Carbonate, CaCO3)
sedimentary
Chert
Chert (microcrystalline quartz, SiO2)
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Sodalite
Sodium Aluminum Silicate Chloride (Na8Al6Si6O24Cl2)
mineral
Likely galena-bearing ore
Galena (PbS), possibly mixed with quartz or carbonate gangue
mineral
Galena with Pyrite
Lead Sulfide (PbS) associated with Iron Sulfide (FeS2)
mineral
Fossilized Oyster Shell
Gryphaea or Crassostrea fossil (Calcium Carbonate, CaCO3)
sedimentary
Chert (and associated Flint)
Silicon Dioxide (SiO2)
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Fossil Shell
Invertebrate fossil (Mollusca)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Fluorite
Calcium Fluoride (CaF2)
mineral
Galena
Lead(II) sulfide (PbS)
mineral
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Chert (Iron-stained)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Agatized Dinosaur Bone
Permineralized Dinosaur Bone (Silicified/Agatized Bone)
fossil
Metallic sulfide ore, likely galena-bearing rock
Galena (lead sulfide, PbS), possibly with pyrite or other sulfides
mineral
Fossilized Fish (Lepidotes)
Lepidotes sp. (Order: Lepisosteiformes)
sedimentary
Magnetite / Lodestone
Magnetite (Fe3O4)
mineral
Baryte (Barite)
Barium sulfate (BaSO4)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Pyrite
Iron Pyrite (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Fossilized Gastropod / Coral
Phylum Mollusca / Cnidaria (Silicified or Calcified)
fossil
Galena
Lead Sulfide (PbS)
mineral
Fossil Coral
Scleractinia (Fossilized Hexacoral)
fossil
Pyrite
Iron Sulfide (FeS2)
mineral