Organic Specimen (Fossil)

Limestone with Fossil Inclusions

Sedimentary Carbonate Rock (CaCO3)

Fossiliferous Limestone (Coquina / Shell Limestone)

CaCO3 (Calcium Carbonate)

Chert (Chert / Flint)

Silicon Dioxide (SiO2)

Fossiliferous Limestone

Bioclastic Limestone (CaCO3)

Petrified Wood

Silicified Wood (SiO2)

Limestone (Weathered Pebble)

Calcium Carbonate (CaCO3) / Limestone

Petrified Wood

Silicified Wood (primarily quartz/chalcedony replacing organic wood structure)

Petrified Wood

Silicified Wood (SiO2)

Calcareous Tufa / Limestone Fragment

Calcium Carbonate (CaCO3)

Light-colored limestone (probable fossiliferous or micritic limestone)

Calcite-rich carbonate rock; predominantly CaCO₃ (calcite)

Coal

Coal (Sedimentary Rock / Organic Rock)

Ferruginous Sandstone (Ironstone)

Arenite with Iron-Oxide Cement (FeO(OH)·nH2O / Fe2O3)

Chert (Nodule)

Chert (Silicon Dioxide, SiO2)

Chert (often found as Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Coquina or Fossiliferous Limestone

Fossiliferous Calcarenite (CaCO3)

Fossilized ammonite

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

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Fossiliferous Shale Matrix

Clastic Sedimentary Rock with Brachiopod or Mollusk shell fragments

Abalone Shell / Mother of Pearl

Haliotis sp. (Nacreous shell layer)

Calligraphy Stone

Fossiliferous Limestone (containing Hematite and Shells)

Calamites (Fossil Plant)

Calamites (Genus), belonging to the class Equisetopsida

Ironstone Concretion (Limonite/Goethite)

Iron oxide concretion (contains FeO(OH)·nH2O)

Anthracite Coal

Anthracite (Carbon based fossil fuel)

Fossiliferous Limestone

Calcium Carbonate (CaCO3) - Limestone

Sandstone (Quartz-rich)

Sandstone (SiO2 dominated)

Sandstone (Quartz-rich)

Clastic sedimentary rock (SiO2 primary)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert Pebble

Microcrystalline Quartz (SiO2)

River Stone (likely Mudstone or Siltstone)

Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)

Glauconitic Sandstone (Greensand)

Glauconitic Sandstone ((K, Na)(Fe3+, Al, Mg)2(Si, Al)4O10(OH)2)

Tufa (Limestone)

Calcareous Tufa (CaCO3)

Banded Chert

Microcrystalline Quartz (SiO2)

Fossilized oyster shell

Bivalvia; likely an oyster (Ostreidae), partly mineralized with calcite

Limonite Concretion

Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)

Fossil Coral (Honeycomb Coral)

Favosites (extinct genus of Tabulate coral)

Fossilized Coral (Petoskey Stone precursor)

Hexagonaria percarinata (Fossilized Rugose Coral)

Petrified Wood

Silicified Wood (SiO2)

Sandstone

Arenite (principally SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide cement)

Sandstone Cobble

Arenite (Sandstone)

Sandstone Cobble

Arenite (predominantly Quartz Sandstone)

Petrified Wood

Silicified wood (Quartz / Chalcedony replacement)