Organic Gemstone (Fossilized Resin)

Fossilized Echinoid / Sea Urchin Internal Mold

Echinoidea internal cast (steinkern)

Fossilized Coral (Petoskey Stone / Favosites)

Hexagonaria percarinata / Favosites sp. (Calcite, CaCO3)

Banded Agate

Cryptocrystalline variety of Quartz (SiO2)

Petrified Wood

Silicified Wood / Fossilized Wood (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Fossilized Shark Tooth (Otodus obliquus)

Otodus obliquus (Mineralized Apatite / Bio-apatite)

Composite Turquoise or Reconstituted Turquoise with Copper inclusions

CuAl6(PO4)4(OH)8·4H2O (Turquoise) mixed with matrix and copper/bronze flakes

Petrified Wood

Silicified Wood / Xylopal

Pearl (in a decorative hair comb setting)

Calcium carbonate (CaCO3) primarily as Aragonite, bonded with Conchiolin

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Stromatolite (Jasper-replaced)

Fossilized Stromatolite (Cyanobacteria / Cryptozon / Silica SiO2)

Fossilized Crab Carapace (Concretion)

Decapoda (fossil), typically preserved in calcite or siderite concretion

Shark Tooth Fossil

Vertebrate fossilized tooth (various genera such as Carcharodon, Otodus, or Negaprion)

Shark Tooth Fossil

Carcharodon / Otodus fossilized tooth (Calcium Phosphate / Hydroxyapatite)

Fossilized Coral (Petoskey Stone or Rugose Coral)

Antophyllum (Hexagonaria) or Scleractinia (CaCO3)

Fossilized Gastropod (Snail)

Class Gastropoda (internal mold or 'steinkern')

Fossil Shark Tooth

Chondrichthyes (class); likely Lamniformes (order) fossilized in Apatite/Hydroxyapatite

Fossil Shell (Bivalve)

Class Bivalvia (Likely a member of the Ostreidae or Gryphaeidae family), CaCO3

Mookaite Jasper

Silicified Radiolarite (SiO2)

Chert (Chert Nodule with Cortex)

Microcrystalline Quartz (SiO2)

Fossiliferous Limestone (with Oyster Fossils)

Fossiliferous Calcarenite / Bivalve Mollusk Fossil

Shark Tooth Fossil

Otodus sp. (possibly Cretalamna)

Fossilized Echinoid (Sea Urchin)

Echinoidea (Class) - Often found as Micraster or Clypeaster specimens

Turquoise

Hydrated phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O

Fossil Coral (Rugosa or Solitary Coral)

Rugosa (Order), often referred to as 'Horn Coral' (Lithostrotionella or Grewingkia)

Synthetic Resin Charm (Seal Shape)

Polymer Resin with plastic glitter / Polyethylene terephthalate glitters

Freshwater Pearl

Calcium Carbonate (CaCO3) - Aragonite/Calcite organic composite

Fossilized Fish Skeleton in Matrix

Vertebrata (Class: Actinopterygii), typically found in limestone or shale matrices

Fossilized Shark Tooth (Fragment)

Elasmobranchii fossil (likely Cretalamna or Squalicorax genus)

Turquoise (possibly reconstituted or dyed howlite)

CuAl6(PO4)4(OH)8·4H2O (Hydrated Copper Aluminum Phosphate)

Fossilized Dinosaur Skull (Tyrannosaurus rex)

Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica

Chert (variably Oolitic or Fossiliferous)

Sedimentary Cryptocrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Fossilized Oyster in Flint

Gryphaea or Exogyra embedded in SiO2 (Flint/Chert)

Fossil Snail

Gastropoda (fossilized)

Fossil Snail

Gastropoda (fossilized)

Fossilized Crinoid Stem Segment

Crinoid (Phylum Echinodermata, Class Crinoidea)

Turquoise

Hydrated phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)

Tree Agate

Chalcedony (SiO2)

Fossil Coral / Fossilized Coral

Scleractinia (Anthodiscus / Favia / Montastraea fossil)

Shark Tooth Fossil

Otodus obliquus (or similar prehistoric lamniform shark tooth)

Fossilized Echinoid (Sea Urchin)

Echinoidea (Fossil)