Turquoise butterfly carving
Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O (carved; possibly stabilized or dyed)
gemstone
Category
Organic Gemstone (Fossilized Resin)
Browse organic gemstone (fossilized resin) specimens identified by the Rock Identifier community.
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Opalite
Synthetic glass / Opalized glass
gemstone
Fossilized shell
Indeterminate bivalve shell; likely calcitic or aragonitic shell material (CaCO₃)
fossil
Fossilized Bone (Petrified Bone)
Permineralized Vertebrate Remains
sedimentary
Fossilized Shark Tooth
Chondrichthyes (Class) - likely Carcharodon or Otodus genus
fossil
Fossilized Shark Tooth
Bioapatite (Calcium Hydroxyapatite) replacement
mineral
Fossilized Shark Tooth
Otodus sp. (approximate genus) / Hydroxyapatite fossil
sedimentary
Fossilized Shark Tooth
Chondrichthyes (class)
fossil
Fossil Bivalve / Ostreid Shell (Hag Stone / Perforated Pebble)
Phylum Mollusca, Class Bivalvia
fossil
Polished agate-like stone (uncertain; possibly a fossil or shell fragment)
Likely microcrystalline quartz (chalcedony), SiO₂; exact identification is limited by the image
mineral
Mosasaur Jaw Fossil in Matrix
Mosasaurus (family Mosasauridae) in Phosphate Sandstone
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Fossilized Shark Tooth (Partial) or Coprolite
Elasmobranchii (fossil) or Coprolite (trace fossil)
fossil
Agatized fossil nodule, possibly silicified wood or bone
Microcrystalline quartz (chalcedony), SiO₂, replacing fossil material
fossil
Fossil Coral
Scleractinia (Fossilized Coral) / Calcium Carbonate (CaCO3) or Silica (SiO2)
fossil
Fossilized Shark Tooth
Chondrichthyes (Class) fossil
fossil
Fossilized Wood (Petrified Wood) and Associated Rocks
Silicified Wood / Xylopal
fossil
Fossilized bivalve shell
Paleozoic–Mesozoic bivalve fossil; commonly classified as Bivalvia indet.
fossil
Fossilized Shark Tooth (fragment)
Elasmobranchii (Class) fossil
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossilized Shark Tooth
Elasmobranchii fossil (likely Odontaspididae family)
sedimentary
Fossilized Coral (Favosites)
Favosites (extinct genus of tabulate coral)
sedimentary
Fossilized Pycnodonte Oyster
Pycnodonte (Gryphaeostrea) species; Composition is Calcium Carbonate (Calcite/Aragonite)
sedimentary
Shark Tooth Fossil
Carcharocles megalodon or similar fossilized shark tooth
fossil
Fossilized Shark Tooth
Eocene Lamniformes (Mackerel Shark clade)
fossil
Fossilized Shark Tooth
Carcharocles sp. (likely Lemon or Sand Tiger)
sedimentary
Ammonite Fossil (Small Pyritized or Calcitized Internal Mold)
Ammonoidea
sedimentary
Fossilized Shark Tooth
Carcharhinus sp. (likely Bull or Requiem shark family)
sedimentary
Fossilized Coral in Chert
Anthozoa (Class) fossil in Cryptocrystalline Quartz (SiO2)
fossil
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Coral Fossil (Scleractinia)
Scleractinia (Order), primarily CaCO3 (Aragonite or Calcite)
sedimentary
Fossiliferous limestone pebble (probable coral or shell fossil)
Calcite (CaCO₃), commonly biogenic limestone; exact fossil taxon indeterminate from the image
fossil
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium), CuAl6(PO4)4(OH)8·4H2O
mineral
Ammolite
Biogenic gemstone (Aragonite, CaCO3)
mineral
Fossilized Oyster Shell (Limestone/Coquina)
Crassostrea (Fossilized Bivalve), Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Coal (Anthracite / Bituminous)
Organic Sedimentary Rock (Carbon-based)
sedimentary
Fossil Shark Tooth
Chondrichthyes (class)
fossil
Polished petrified wood
Silicified wood; primarily microcrystalline quartz (SiO₂) replacing woody tissue
fossil
Fossilized Shark Tooth
Chondrichthyes tooth
fossil
Fossilized Bone Fragment
Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)
sedimentary