Organic Specimen (Fossil)

Fossil Coral (Rugose / Horn Coral)

Rugosa (Tetracoralla)

Chert / Flint

Chert (Microcrystalline Quartz, SiO2)

Fossil Coral

Scleractinia (Fossilized Coral)

Turritella Fossil

Turritella (Class Gastropoda, Family Turritellidae)

Crinoid Stem Fossil

Class Crinoidea (Phylum Echinodermata), often preserved in Limestone or Calcite (CaCO3)

Brachiopod Fossil

Phylum Brachiopoda (replaced by Calcite or Silica)

Crinoid Stem Fossil

Crinoid columnal (Class Crinoidea)

Fossilized Bivalve in Limestone

Class Bivalvia within Sedimentary Matrix (likely CaCO3)

Amber

Succinite (a specific common type) or Fossilized Tree Resin (C10H16O)

Green Jasper (with Quartz veining)

Jasper (Silica-rich microcrystalline variety of Quartz), formula: SiO2

Green Moss Agate

Silicon Dioxide (SiO2) with inclusions of hornblende or chlorite

Green Jasper

Silicon Dioxide (SiO2) with impurities

Honey calcite (orange calcite)

Calcite, calcium carbonate (CaCO₃)

Chert (Flint variety)

Microcrystalline Silica (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Bivalve Shell (Fossil or Contemporary)

Class Bivalvie (various genera and species of clams, cockles, etc.)

Limestone with Chert

Calcium Carbonate (CaCO3) with Silica (SiO2) inclusions

Petrified Wood (Agatized/Silicified Wood)

Silicified Paleoxylon (primarily SiO2)

Limestone

Calcareous sedimentary rock (CaCO3)

Fossil Shark Tooth

Carcharhinidae or Lamniformes sp. (possibly Carcharodon or Otodus genus)

Crinoid Stem Fossil in Matrix

Crinoid (Class Crinoidea) in Limestone/Siltstone matrix

Turritella Agate / Fossiliferous Limestone

Elimia tenera (commonly mislabeled as Turritella in chalcedony/calcite matrix)

Moss Agate

Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide

Sandstone (likely Quartzite-grade)

Arenite (primarily SiO2)

Chert (specifically Tan/Brown Chert)

Chert (SiO2)

Pink Opal

Amorphous Hydrous Silica (SiO2·nH2O)

Chert (with Iron Staining)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Limonite with Trace Fossils

Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)

Mosasaur Tooth

Mosasaurus beaugei (Fossilized Tooth)

Unknown Organic Object (likely a berry or fruit)

Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.

Fossil Coral

Hexagonaria or Rugose Coral (Fossilized Calcium Carbonate / Silica)

Chert Nodule

Microcrystalline Quartz (SiO2)

Fossiliferous Limestone

Calcite-rich sedimentary rock with invertebrate fossils (CaCO3)

Glauconitic Sandstone (Greensand)

Glauconitic Quartz Arenite (containing Glauconite, (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)

Tumbled brown jasper

Microcrystalline quartz/chalcedony (SiO₂), commonly iron-oxide stained

Petrified Wood

Silicified Wood (primarily Quartz / Chalcedony: SiO2)

Ammonite Fossil

Ammonoidea

Polished ammonite fossil

Ammonoidea; likely a polished, chambered ammonite such as Acanthoceras or related Cretaceous form

Fossil Coral

Scleractinia (Fossilized Hexacoral)

Crinoidal Limestone

Fossiliferous Limestone containing Crinoid stem fragments (Echinodermata)

Turritella Agate

Elimia tenera silicified fossiliferous chalcedony

Fossiliferous Limestone

Fossiliferous Calclutite / Bio-calcarenite (CaCO3)