Organic Specimen (Fossil)

Fossilized Bone / Dinosaur Fossil

Fossilized vertebrate bone (permineralized)

Shale

Fissile Mudstone (Shale)

Fossiliferous limestone

Bioclastic limestone, likely containing brachiopod or bivalve impressions

Amber

Succiniferous organic material (Succinite)

Chert Concretion

Microcrystalline Quartz (SiO2)

Petrified Wood

Silicified wood (primarily Silicon Dioxide, SiO2)

Shale

Mudstone (composed primarily of clay minerals like kaolinite, illite, and smectite, with quartz and calcite)

Fossil-bearing limestone

Bioclastic limestone, likely containing bivalve or brachiopod impressions

Tumbled fossil coral or carbonate fossil fragment

Likely fossilized coral, composed mainly of calcite (CaCO₃); exact identification is uncertain from the image

Petrified Wood

Silicified Wood (SiO2)

Fossilized Brachiopod Shell / Mold

Phylum Brachiopoda (Fossilized organic matrix replaced by Silica/Calcite)

Pyrite

Iron Sulfide (FeS2)

Fossilized Shark Tooth

Chondrichthyes (Class)

Fossiliferous Limestone

Calcite (CaCO3) with Bioclastic inclusions

Petrified Wood

Silicified wood (primarily Quartz, SiO2)

Limestone with Fossil Inclusion

Sedimentary Calcium Carbonate (CaCO3)

Amber

Succiniferous fossil resin (C10H16O)

Amber

Succinates (C10H16O)

Sandstone Concretion with Fossil Wood

Ferruginous Sandstone Concretion (SiO2 with Fe2O3 cement)

Fossil brachiopod shell

Likely a spiriferid or orthid brachiopod; shell composed mainly of calcium carbonate (calcite)

Fossiliferous Chert or Limestone

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

Fossiliferous Limestone

Biogenic Calcium Carbonate (CaCO3)

Amber

Succinite (fossilized resin)

Petrified Wood

Silicified Wood (SiO2)

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with Bioclasts

Fossilized Shark Tooth (Otodus obliquus)

Otodus obliquus (Mineralized Apatite / Bio-apatite)

Chert or flint with chalcedony/quartz veins

Microcrystalline silica: primarily quartz (SiO₂), including chalcedony; possible fossiliferous limestone or silicified material

Fossiliferous Limestone

Bioclastic Limestone (CaCO3)

Petrified Wood

Silicified Wood (primarily Chalcedony/Quartz, SiO2)

Fossil Shark Tooth

Chondrichthyes (Class)

Petrified Wood

Silicified Wood (primarily SiO2)

Fossiliferous limestone (reef or shell-rich limestone)

Bioclastic calcarenite/calcirudite; predominantly calcite (CaCO₃)

Limestone with Fossil Fragment

Sedimentary carbonate rock (CaCO3)

Fossiliferous limestone with silicified fossil material

Bioclastic limestone; likely marine mollusk/coral fragments, locally replaced by chalcedony or calcite

Fossil Shark Tooth

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

Amber

Organic gemstone (Succinite is common if from the Baltic)

Chert Nodule / Ironstone Concretion

Microcrystalline Quartz (SiO2) with Iron Oxides

Coral fossil (likely fossilized colonial coral)

Calcareous fossil coral; commonly *Scleractinia* or *Tabulate/ rugose coral* (identification requires close pore-pattern examination)

Fossil oyster shell

Fossilized bivalve, likely Ostrea or a related oyster genus; calcite (CaCO₃) shell

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Fossiliferous limestone

Bioclastic carbonate rock, chiefly calcite (CaCO₃), containing fossil fragments—possibly coral or bryozoan

Fossiliferous limestone

Bioclastic limestone, predominantly calcite (CaCO₃)