Sedimentary (Fossilized)

Sandstone (likely Fossiliferous)

Arenite / Sedimentum arenaceum

Fossilized stromatolite or laminated microbial mat

Layered carbonate/chert fossil; exact taxon indeterminate from the image

Sandstone

Arenite (SiO2 primarily)

Petoskey Stone (Coral Fossil)

Hexagonaria percarinata (Fossilized colonial rugose coral)

Crinoid Columnal Fossil

Crinoid ossicle (Class Crinoidea)

Picture Jasper

Jasper (Silicon Dioxide, SiO2 with impurities)

Fossilized oyster shell

Ostrea/Exogyra sp.; calcium carbonate (mostly calcite)

Fossilized gastropod shell

Calcitic or aragonitic gastropod fossil; likely Mollusca, Gastropoda

Fossilized bivalve shell

Bivalvia indeterminate; likely a fossil cockle or clam shell, aragonite/calcite replaced or preserved

Fossiliferous Chert or Limestone

Sedimentary rock containing fossilized marine invertebrates (likely crinoid stems or bryozoans)

Small weathered fossil or mineral fragment

Indeterminate; possibly fossilized shell, bone, or a pale carbonate mineral

Sea Shell (Fighting Conch Fragment)

Calcium Carbonate (CaCO3) - Strombus alatus fragment

Amber (Butterscotch/Egg Yolk Variety)

Succinite (Approx. C10H16O)

Kambaba Jasper

Stromatolite (Fossilized Algae within Microcrystalline Quartz)

Fossilized Shark Tooth

Chondrichthyes tooth

Petrified Wood

Silicified Wood (primarily SiO2)

Fossilized bone fragment

Petrified vertebrate bone; mineralized hydroxyapatite replaced or infilled by silica/carbonates

Fossilized bone fragment

Mineral-replaced vertebrate bone, commonly apatite [Ca₅(PO₄)₃(F,OH,Cl)]

Fossil shell fragment (likely bivalve)

Bivalvia indeterminate; shell material chiefly aragonite or calcite (CaCO₃)

Chert (containing a small fossil)

Microcrystalline Quartz (SiO2)

Mookaite Jasper

Silicon Dioxide (SiO2) with impurities

Fossilized Shark Tooth (likely Sand Tiger Shark)

Carcharias taurus (fossilized hydroxyapatite/calcium phosphate)

Chert (variably Oolitic or Fossiliferous)

Sedimentary Cryptocrystalline Quartz (SiO2)

Fossilized bone fragment

Fossil bone, composed chiefly of carbonate-fluorapatite (bioapatite)

Fossil Coral

Hexagonaria or Rugose Coral (Fossilized Calcium Carbonate / Silica)

Fossil Bivalve / Ostreid Shell (Hag Stone / Perforated Pebble)

Phylum Mollusca, Class Bivalvia

Fossilized Shark Tooth

Fossilised Chondrichthyes dental specimen (likely Otodus or Carcharias sp.)

Amber / Copal

Organic resin, C10H16O

Fossil Shark Tooth

Carcharodon or Carcharias fossil (Vertebrate Fossil)

Amber (or polished Chalcedony bead)

Fossilized Tree Resin / SiO2 (Silicon Dioxide if Chalcedony)

Bivalve Fossil (Shell Fragment)

Class Bivalvia (Calcium Carbonate - CaCO3)

Fossilized shell fragment

Likely calcitic or aragonitic bivalve/gastropod shell; exact taxon indeterminate

Dragon Stone

Ohko Stone (Argillaceous sedimentary rock)

Fossilized bivalve shell (small cockle-type shell)

Bivalvia; exact species cannot be determined from the image

Amber (Copal)

Succinite (fossilized tree resin)

Amber

Succinite (specifically for Baltic amber); Fossilized Tree Resin (C10H16O)

Fossilized bone fragment

Permineralized vertebrate bone, likely mammalian or reptilian; exact identification requires microscopy

Fossilized Gastropod Internal Mold

Gastropoda (Steinkern fossil)

Hard Sandstone (Quartzite)

Quartz-rich Sedimentary Rock (Proto-Quartzite)

Fossil tooth, likely shark tooth

Fossilized selachian tooth, possibly Carcharodon or a related lamniform shark

Fossilized bone fragment (probable vertebrate bone)

Permineralized bone; exact taxon indeterminate from the image

Fossil Coral

Scleractinia (Stony Coral) fossil