Organic (Biological Specimen)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Granite

Phaneritic Plutonic Felsic Rock (primarily Quartz (SiO2), Alkali Feldspar, and Plagioclase Feldspar)

Fossiliferous Limestone (Murchisonia/Gastropod Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Petrified Wood

Silicified Wood (primarily SiO2)

Crinoid Stem Fossil

Class Crinoidea (Phylum Echinodermata), primarily Calcium Carbonate (CaCO3)

Chalky limestone

Micritic limestone, primarily calcite (CaCO₃)

Chert Pebble / Brachiopod Fossil Internal Mold

Silicon Dioxide (SiO2) / Fossil: Brachiopoda (generic internal mold)

Chert (Nodule)

Cryptocrystalline Silica (SiO2)

Calcite

Calcite (CaCO3)

Chert Pebble (Jasperoid/Flint)

Silicon Dioxide (SiO2) - cryptocrystalline quartz

Fossil Coral

Fossilized Scleractinia or Tabulata (various genera/species)