Limestone

Marble

Recrystallized Limestone (CaCO3)

Coquina

Coquina (Bioclastic Limestone)

Coquina

Coquina (Bioclastic Limestone)

Limestone (Flagstone)

Fossiliferous Limestone (CaCO3)

Fossiliferous Limestone (Coquina / Shell Limestone)

Bioclastic Limestone (CaCO3)

Fossiliferous Limestone (Coquina / Shell Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Fossiliferous Limestone with Rugose Coral

Rugosa (order), typically preserved in CaCO3 (Calcite)

Fossiliferous Limestone (Coral Fossil)

Scleractinian Coral in Calcium Carbonate (CaCO3)

Coquina / Fossiliferous Limestone

Bioclastic Limestone (CaCO3)

Coquina (Limestone)

Bioclastic Limestone (CaCO3)

Marble

Metamorphosed Limestone/Dolomite

Oolitic Limestone

Oolitic Limestone (CaCO3)

Fossiliferous Limestone (with Crinoids/Coral)

Fossiliferous Limestone (CaCO3)

Coquina

Coquina (a type of limestone)

Coquina

Bioclastic Limestone (CaCO3)

Coquina / Shell Limestone

Coquina (Bioclastic Limestone)

Coquina

Biogenic Limestone (Coquina)

Fossiliferous Limestone (Coquina / Shell Limestone)

Biogenic Limestone (CaCO3)

Crushed Limestone

Calcium Carbonate (CaCO3)

Chert (Flint Nodules)

Silicon Dioxide (SiO2)

Chert (Nodule / Geode fragment)

Microcrystalline Quartz (SiO2)

Blue Spinel on Marble with Phlogopite

MgAl2O4 (Spinel) in CaCO3 (Calcite/Marble) matrix

Chert (with Chalky Cortex)

Silicon Dioxide (SiO2)

Crinoid Stem Fossil

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

Limestone (specifically Dolomitic Limestone)

Calcium Magnesium Carbonate (CaMg(CO3)2)

Fossiliferous Limestone (Crinoidal Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Fossil Shell in Sedimentary Matrix

Bivalvia (fossil) in Calcium Carbonate Matrix

Coquina Limestone (Fossiliferous Limestone)

Calcareous bioclastic sedimentary rock (CaCO3)

Limestone (specifically Fossiliferous Limestone)

Calcium Carbonate (CaCO3)

Limestone (specifically Chalky Limestone)

Calcium Carbonate (CaCO3 / Calcite)

Fossilized Bivalve Shell

Bivalvia (fossil specimen)

Hag Stone (Piddock bored rock)

Calcareous sedimentary rock featuring Pholadidae borings

Travertine

Terrestrial Sedimentary Limestone (CaCO3)

Sandstone or Limestone

Sedimentary Rock

Lapis Lazuli

Lapis Lazuli (Complex aggregate of Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2, Pyrite, and Calcite)

Chert (Field Stone)

Microcrystalline Quartz (SiO2)

Dolomite or Limestone (Carbonate Rock)

CaMg(CO3)2 (Dolomite) or CaCO3 (Limestone / Calcite)

Fossilized Fish (Lepidotes)

Lepidotes sp. (Order: Lepisosteiformes)

Trilobite Fossil

Trilobita (Class), likely Phacopid or Asaphid order

Breciated Limestone with Calcite Veins

Sedimentary Breccia (CaCO3)

River Cobble (likely Quartzite or Limestone)

SiO2 (Quartzite dominant) or CaCO3 (Limestone dominant)

Chert / Flint

Microcrystalline or cryptocrystalline quartz (SiO2)