Organic Gemstone (Fossilized Resin)

Fossilized Bivalve Shell

Bivalvia (Phylum Mollusca)

Fossilized Shark Tooth

Chondrichthyes (Class)

Dendritic Agate (Tree Agate)

Chalcedony (Silicon Dioxide, SiO2) with Manganese or Iron Oxide inclusions

Petrified Wood

Silicon Dioxide Fossilized Wood (SiO2)

Bivalve Fossil (Fossilized Shell)

Class Bivalvia (fossilized in Calcium Carbonate/Aragonite)

Honeycomb Coral Fossil

Favosites (extinct genus of tabulate coral)

Tumbled turquoise

Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Botiroidal Chalcedony or Silicified Fossil Coral

Silicon Dioxide (SiO2) - Chalcedony / Scleractinia (if fossilized)

Fossilized Shark Tooth

Scapanorhynchus (Sand Tiger Shark relative)

Dinosaur Claw Fossil

Fossilized Theropod Claw (Vertebrate Palaeontological Specimen)

Fossilized Dinosaur Bone

Perineralized Bone (Fluorapatite/Quartz replacement)

Fossil Shark Tooth

Otodus sp. or Carcharocles sp. (likely fossilized Chondrichthyes)

Fossilized bivalve shell

Calcitic or aragonitic mollusk shell, commonly Bivalvia; exact species indeterminate

Turquoise (likely stabilized or composite)

Turquoise, hydrated copper aluminum phosphate — CuAl₆(PO₄)₄(OH)₈·4H₂O

Orthoceras Fossil in Limestone

Orthoceras (extinct genus of cephalopods) in Carboniferous or Devonian Limestone

Petrified Wood

Silicified Wood (primarily SiO2)

Fossil Shark Tooth

Carcharodon or Carcharias fossil (Vertebrate Fossil)

Copper Composite Turquoise (Purple and Blue)

Composite Hydrous copper aluminum phosphate with bronze/copper matrix binding

Chalcedony (Agate/Seashell replacement)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Fossilized Shark Tooth

Chondrichthyes (Class)

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Fossilized Bone Fragment

Vertebrate Fossil Material (Apatite/Calcium Phosphate)

Green glass-like cabochon, likely synthetic glass or resin

Unidentified green transparent material; possibly molded glass, synthetic spinel, or resin

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Fossilized Shark Tooth

Fossilized elasmobranch tooth (Apatite/Calcium Phosphate)

Fossilized bone fragment

Petrified bone, mineral-replaced vertebrate bone; exact taxon indeterminate

Jasper

Silicon Dioxide (Microcrystalline Quartz, SiO2)

Fossilized Coral (Petoskey Stone or Tabulate Coral)

Scleractinia or Tabulata (CaCO3 - Calcium Carbonate)

Fossilized Shark Tooth or Bone Fragment

Vertebrate Fossil (likely Carcharodon or similar genus)

Fossilized Shark Tooth

Elasmobranchii dentition (calcium phosphate / hydroxyapatite)

Fossilized Shark Tooth

Carcharocles sp. or Striatolamia sp. (Phosphate/Carbonate mineralized Hydroxyapatite)

Chert (and Fossilized Brachiopod shell)

Sedimentary Cryptocrystalline Quartz (SiO2)

Red Coral

Corallium rubrum

Fossiliferous Limestone with Fossil Fragment

Fossiliferous Limestone (CaCO3 with organic remains)

Palm Wood Fossil

Palmoxylon

Carved turquoise pendant

Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O

Dinosaur Skull Fossil (Velociraptor Replica)

Velociraptor mongoliensis fossil specimen in sedimentary matrix

Polished blue chalcedony or glass-like quartz specimen

Chalcedony (microcrystalline SiO₂), possibly treated or synthetic; exact identification requires testing

Fossilized Shark Tooth (Root Portion)

Selachimorpha (partial specimen)

Fossilized Plant or Tree Bark

Lepidodendron or Sigillaria (example genera)

Petrified Wood / Red Jasper

Silicified wood (primarily Silicon Dioxide, SiO2)

Ammolite

Ammolite (Biogenic Aragonite with trace elements; fossils of Placenticeras meeki and Placenticeras intercalare)