Organic Specimen (Fossil)

Sandstone (Ferruginous)

Clastic Sedimentary Rock (SiO2 with FeO/Fe2O3)

Amber

Succinite (specifically for Baltic amber); approximate formula C10H16O

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Crinoid Stem Fragment

Crinoid (Phylum Echinodermata, Class Crinoidea)

Fossilized Bone Fragment

Permineralized Vertebrate Bone (Hydrox yapatite replaced by Silica or Calcite)

Ammonite Fossil (Polished Half / Cleoniceras)

Ammonoidea (Subclass), often Cleoniceras genus; fossilized with Calcite (CaCO3) and Aragonite

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Limestone (specifically Fossiliferous or Crinoidal Limestone)

Calcium Carbonate (CaCO3) - Calcite Rock

Amber

Succinite (Approximate formula: C10H16O)

Sandstone (Micaceous)

Arenite (composed primarily of SiO2)

Petrified Wood

Silicified wood (primarily SiO2)

Fossiliferous Limestone (Crinoidal)

Bioclastic Limestone (predominantly CaCO3)

Sandstone (Calcareous or Ferruginous)

Clastic sedimentary rock (SiO2 with CaCO3 or Fe2O3 cement)

Petrified Wood

Silicified Wood (SiO2)

Fossil Shell (Bivalve)

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

Sandstone Chert Concretion

Silica-cemented Concretion (primarily SiO2)

Amber

Succinurite (C10H16O)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Sandstone (Ferruginous)

Arenite (with iron oxide cement, Fe2O3)

Fossilized Fish Skeleton in Matrix

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

Petrified Wood

Silicified wood (primarily SiO2 - Silicon Dioxide)

Petrified Wood (Agatized/Silicified Wood)

Silicified Wood (SiO2)

Shale

Shale (Sedimentary rock composed of mud/clay minerals)

River Pebble (Siltstone/Mudstone)

Clastic sedimentary rock

Amber

Succinite (fossilized tree resin)

Amber (with potentially inclusions)

Succinite (Fossilized Tree Resin)

Petrified Wood

Silicified Wood (SiO2)

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2 with minor Fe2O3)

Limestone with Chert or Siltstone bands

Sedimentary carbonate rock (CaCO3) often with siliceous impurities

Sandstone (likely Fossiliferous Sandstone)

Clastic sedimentary rock (primarily SiO2)

Gastropod Fossil (Internal Mold)

Phylum Mollusca, Class Gastropoda (Steinkern)

Amber

Succinite (specifically for Baltic amber); chemical formula approximately C10H16O

Chert (Chert / Flint)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Fossiliferous Shale Matrix

Clastic Sedimentary Rock with Brachiopod or Mollusk shell fragments

Amber

Succinite (specifically for Baltic amber); Complex mixture of organic compounds (C10H16O)

Chert (often called Flint)

Microcrystalline Quartz (SiO2)

Fossilized Coral (Petoskey Stone or Rugose Coral)

Antophyllum (Hexagonaria) or Scleractinia (CaCO3)

Coral Fossil (Petrified Coral)

Scleractinia (Order) - Calcified Fossil Skeleton (CaCO3)

Liesegang Ring Siltstone

Siltstone with iron oxide Liesegang bands

Sandstone with Quarzite clasts

Arenite (SiO2 based)