Limestone (specifically Carboniferous Limestone)
Calcium Carbonate (CaCO3)
sedimentary
Category
Organic Specimen (Fossil)
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Sandstone
Arenite (SiO2 based typically)
sedimentary
Dendritic Agate or Manganese Nodule in Chert/Limestone
Silicon Dioxide (SiO2) with Manganese Oxide (MnO2) inclusions
sedimentary
Orange Tabby (Felis catus)
Felis silvestris catus (variety: Red Mackerel Tabby)
Organic/Biological specimen (Non-Mineral)
Pyrite
Iron Pyrite (FeS2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Fighting Conch (Sea Shell)
Strombus alatus (primarily composed of Calcium Carbonate / CaCO3)
mineral
Sandstone (Ferruginous)
Arenite (Fe-rich SiO2)
sedimentary
Fossilized Echinoid
Echinoidea (likely of the order Echinoidea)
fossil
Shale
Shale (Lutite)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Biogenic Inclusions
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Red Sandstone
Arenite (with Iron Oxide cement)
sedimentary
Limestone (specifically Bituminous or Carbonaceous Limestone)
Calcium Carbonate (CaCO3) with Organic Impurities
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Shark Tooth Fossil
Lamniformes (Shark tooth fossil composed of Fluorapatite)
fossil
Concretion
Calcareous/Siliceous Concretion
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (likely Quartzose)
Arenite (SiO2 principal mineral)
sedimentary
Sandstone (Fossiliferous)
Arenite / Clastic Sedimentary Rock
sedimentary
Sandstone with Concretions / Liesegang Rings
Arenite with iron oxide banding
sedimentary
Ammonite Fossil
Ammonoidea (primarily composed of Calcite, CaCO3, or Pyrite)
sedimentary
Dendritic Quartz
Silicon Dioxide (SiO2) with Manganese Oxide inclusions
mineral
Limestone
Sedimentary rock composed primarily of Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Fossiliferous Limestone (Coquina / Shell Bed)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Orthoceras Fossil
Orthoceras regulare
fossil
Turritella Agate / Fossiliferous Limestone
Elimia tenera in Chalcedony/Calcite Matrix
fossil
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Chert (and Fossiliferous Limestone)
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Fossil Coral
Scleractinia (fossil order), primarily Calcium Carbonate (CaCO3)
sedimentary
Banded Sandstone
Arenite (with iron oxide banding)
sedimentary
Ironstone Concretion
Ferruginous Sandstone / Hematite-rich Concretion
sedimentary
Limestone with Lichen
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Crinoid Stem Fossil (in matrix)
Crinoid (Class Crinoidea)
fossil
Fossiliferous Limestone with Brachiopod
Limestone (Calcium Carbonate, CaCO3) with Phylum Brachiopoda fossil
sedimentary
Petrified Tabulate Coral
Favosites (Honeycomb Coral)
fossil
Tumbled pegmatitic granite
Granite, chiefly quartz–feldspar–mica; likely altered pegmatite
igneous
Sandstone
Arenite
sedimentary