Organic Gemstone (Fossilized Resin)

Stromatolite (Jasper-replaced)

Fossilized Stromatolite (Cyanobacteria / Cryptozon / Silica SiO2)

Fossilized tooth fragment, possibly a mammalian tooth

Indeterminate fossil tooth; enamel and dentine, taxon not identifiable from this fragment

Tiger's Eye

Titanium-containing Quartz (Silica: SiO2)

Possible fossilized bone or tooth fragment

Indeterminate fossilized vertebrate material; mineralized hydroxyapatite replaced or coated by silica/carbonate

Turquoise cabochon

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

Fossilized Gastropod (Snail)

Class Gastropoda (internal mold or 'steinkern')

Petrified Wood

Silicified Wood / Fossilized Wood (SiO2)

Shark Tooth Fossil

Carcharodon / Otodus fossilized tooth (Calcium Phosphate / Hydroxyapatite)

Crinoid Stem Fragment

Crinoid (Phylum Echinodermata, Class Crinoidea)

Fossilized Coral (Petoskey Stone or Rugose Coral)

Antophyllum (Hexagonaria) or Scleractinia (CaCO3)

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)

Fossilized Insect in Nodular Matrix

Invertebrata / Insecta fossil in sedimentary concretion

Fossil crocodilian skull and jaws

Crocodyliform fossil; exact genus and species cannot be determined from the image

Fossilized Echinoid (Sea Urchin)

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

Fossilized wood, likely silicified petrified wood

Silicified wood (fossil wood; commonly quartz/chalcedony replacing organic tissue)

Blue-green tumbled gemstone, likely turquoise or dyed turquoise

Turquoise: hydrated copper–aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O; identification is uncertain from the blurry image

Yellow chalcedony (likely citrine-like quartz)

Cryptocrystalline quartz, SiO₂; possibly iron-stained chalcedony or pale citrine

Yellow-brown flint or chert

Microcrystalline quartz (SiO₂), commonly with iron-oxide impurities

Turquoise jewelry beads/earrings

Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; possibly reconstructed or imitation turquoise

Turquoise cabochon ring

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

Red jasper pendant

Jasper, an opaque microcrystalline variety of quartz (SiO₂), commonly colored by iron oxides

Turquoise cabochon ring

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

Fossilized Shark Tooth (Fragment)

Elasmobranchii gen. et sp. indet. (Calcium Phosphate / Apatite fossil)

Petoskey Stone

Hexagonaria percarinata (Calcite / CaCO3)

Spinosaurus aegyptiacus Fossil

Spinosaurus aegyptiacus (permineralized hydroxyapatite)

Fossilized mammoth molar fragment

Proboscidean molar enamel and dentine, commonly Mammuthus spp.

Polished turquoise cabochon pendant

Turquoise, hydrated copper-aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; likely stabilized or matrix-bearing material

Tumbled amber-colored chalcedony (likely carnelian or yellow agate)

Microcrystalline quartz, SiO₂; likely iron-bearing chalcedony

Fossilized Echinoid (Sea Urchin)

Echinoidea (Fossil)

Fossilized leaf or plant impression in shale

Carbonized/impressed plant fossil, likely in fine-grained shale or mudstone; exact taxon indeterminate from the image

Petrified Wood / Fossilized Wood

Silicified Wood (Silicon Dioxide - SiO2)

Fossilized wood fragment

Petrified wood; commonly silicified fossil wood (SiO₂ replacing organic tissue)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Fossilized wood (petrified wood)

Silicified permineralized wood, commonly quartz (SiO₂) replacing or infilling woody tissue

Fossilized Wood (Petrified Wood)

Agatized wood (primarily SiO2)

Fossilized Megalodon Tooth Fragment

Otodus megalodon (Carcharocles megalodon fossil)

Orange agate (likely carnelian chalcedony)

Microcrystalline quartz, SiO₂; chalcedony colored by iron oxides

Tumbled carnelian agate

Microcrystalline quartz (SiO₂), chiefly chalcedony with iron-oxide coloration

Polished carnelian-bearing chalcedony (orange agate)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration

Fossilized Crinoid Stem Segment

Crinoid (Phylum Echinodermata, Class Crinoidea)

Fossilized wood (petrified wood), likely silicified

Petrified wood; predominantly microcrystalline quartz (SiO₂) replacing wood tissue