Sedimentary (Fossil)

Shark Tooth Fossil

Carcharodonta (order Lamniformes), likely Carcharias spp.

Ironstone Concretion (likely)

Goethite/Hematite/Limonite cemented sediment

Chert / Fossiliferous Limestone

Sedimentary Chert (often containing CaCO3 or SiO2 replacements)

Sandstone (with potential mineral inclusions)

Clastic sedimentary rock (primarily Quartz, SiO2)

Coal (most likely Bituminous or Anthracite)

Coal (primarily composed of carbon with varying amounts of other elements)

Fossilized tooth, likely mammalian molar

Indeterminate Mammalia; mineralized dentine and enamel

Fossiliferous Jasper / Miriam Stone / Elephant Skin Jasper

Biogenic Chalcedony / Silicified Fossiliferous Limestone

Fossilized Shark Tooth

Carcharodon carcharias (fossilized) / Hydroxyapatite permineralized with silica or iron

Petrified Wood

Silicified wood (Quartz replacement of organic wood structure)

Petrified Wood

Silicified Wood (SiO2)

Amber

Fossilized tree resin

Fossilized Crinoid Stem

Crinoidea (Echinodermata)

Fossilized Bryozoan

Bryozoa

Petrified Wood

Silicified wood (Quartz / Chalcedony replacement of organic cellulose)

Petrified Wood

Silicified wood (permineralized wood)

Fossilized Shark Tooth (Megalodon or Carcharocles fragment)

Elasmobranchii (Fossilized tooth root / crown section)

Petrified Wood

Silicified Wood (SiO2)

Fossilized Shark Tooth

Elasmobranchii (various species, possibly Carcharias or Odontaspis)

Fossilized Solitary Rugose Coral (Horn Coral)

Rugosa (Order Rugosa)

Petrified Wood

Silicified Wood (SiO2 permineralization)

Amber Dragonfly Brooch

Succinited (Baltic Amber)

Likely weathered fossil shell or fossiliferous limestone

Indeterminate molluscan fossil, possibly a bivalve or brachiopod preserved in carbonate rock

Coral limestone / fossil coral

Biogenic calcium carbonate, chiefly aragonite or calcite (CaCO₃); likely fossilized colonial coral

Fossil Coral (Petoskey Stone / Hexagonaria)

Hexagonaria percarinata (Silicified/Calcite Replacement Coral)

Coral Fossil / Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Syringopora Fossil (Chain Coral)

Syringopora (Order Sarcinulata)

Crinoid Stem Fossil (Stone)

Crinoid columnal (Class Crinoidea)

Favosites Fossil (Honeycomb Coral)

Favosites alpenensis (Order: Tabulata)

Crinoid Columnal Fossil in Chert

Crinoidea stemming section in Microcrystalline Quartz (SiO2)

Fossilized Oyster in Flint

Gryphaea or Exogyra embedded in SiO2 (Flint/Chert)

Fossilized Coral (Petoskey Stone or Tabulate Coral)

Scleractinia or Tabulata (CaCO3 - Calcium Carbonate)

Polished fossil shell, likely orthocone nautiloid

Orthoceras-type fossil; fossilized cephalopod shell, commonly marketed as Orthoceras

Petrified wood

Silicified wood, commonly quartz/chalcedony (SiO₂) replacing wood tissue

Polished fossil-bearing amber cabochon (likely insect inclusion)

Fossilized plant resin; commonly Dominican or Baltic amber, chemically a complex diterpenoid resin

Gastropod shell fragment

Calcareous mollusk shell; primarily aragonite or calcite (CaCO₃)

Tumbled amber

Fossilized tree resin; commonly succinite (organic resin, not a mineral)

Fossil crinoid stem segment (columnal)

Crinoidea; commonly preserved as calcite ossicles, often called entrocrinite

Fossilized ammonite

Ammonoidea (likely a ribbed Jurassic–Cretaceous ammonite), replaced mainly by calcite or silica

Fossilized wood fragment

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

Fossilized ammonite (likely weathered ammonite cross-section)

Ammonoidea; commonly Jurassic–Cretaceous ammonite fossils replaced by calcite or aragonite

Fossil shell fragment, likely brachiopod or bivalve

Indeterminate fossilized carbonate shell; possibly Spiriferida (brachiopod)

Petrified Wood

Silicified Wood (SiO2)