Limestone

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Crushed Limestone Aggregate

Limestone (Calcium Carbonate, CaCO3)

Limestone (River Stone)

Limestone (Calcium Carbonate, CaCO3)

Chert Nodule

Microcrystalline Quartz (SiO2)

Banded Chert

Microcrystalline Quartz (SiO2)

Chert / Flint

Chert (SiO2)

Limestone (Elephant Skin or Karst-weathered)

Calcium Carbonate (CaCO3)

River Stone (Limestone)

Sedimentary Calcium Carbonate (CaCO3)

Chert (Chalcedony/Common Opal)

Microcrystalline Quartz (SiO2)

Fossil Coral

Scleractinia (fossil order), primarily Calcium Carbonate (CaCO3)

Chert

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Coquina or Coral Fossil

Biogenic Limestone (Calcite/Aragonite)

Fossilized Bored Limestone

Limestone with Ichnofossils (Gastrochaenolites or Entobia)

Crinoid Stalk in Limestone

Crinoid fossil in Biomicrite (Limestone)

Marble

Metamorphosed Limestone (mainly CaCO3)

Fossiliferous Limestone with Rugose Coral

Lithostrotionella (Limestone Matrix - CaCO3)

Coquina

Biogenic Limestone (Calcite, CaCO3)

Coquina

Biogenic Limestone (Calcite, CaCO3)

Coquina

Bioclastic Limestone (composed of CaCO3)

Grey Limestone Pebble

Limestone (Calcium Carbonate - CaCO3)

Fossiliferous Limestone (Crinoidal)

Bioclastic Limestone (predominantly CaCO3)

Black Marble with Quartz Veining

Metamorphosed Limestone (Recrystallized CaCO3)

Oolite (Ooid Limestone)

Ooidal Limestone (comprised of CaCO3)

Travertine (Tufa)

Chemical Sedimentary Limestone (CaCO3)

Coquina / Shelly Limestone

Bioclastic Limestone (composed of CaCO3)

Marble (White)

Metamorphosed Limestone (mainly CaCO3)

Coquina

Biogenic Limestone (Calcite / CaCO3)

Fossiliferous Sedimentary Rock (Coquina/Limestone)

Fossiliferous Calcarenite / Bioclastic Limestone

Calcite

Calcium Carbonate (CaCO3)

Limestone (with Calcite Veining)

Calcium Carbonate (CaCO3)

Limestone with Calcite Veins

Sedimentary Calcium Carbonate (CaCO3)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Calcite

Calcium Carbonate (CaCO3)

Fossiliferous Limestone (Coquina)

Calcite (CaCO3) with Bioclastic inclusions

Limestone (specifically Bituminous or Carbonaceous Limestone)

Calcium Carbonate (CaCO3) with Organic Impurities

Chert (Flint)

Chert (Microcrystalline or cryptocrystalline Quartz, SiO2)

Charoite

(K,Sr,Ba,Na)15-16(Ca,Na)32[Si6O11(O,OH)2]2[Si12O18(O,OH)6]2[Si17O25(O,OH)18]2(OH,F)4 · nH2O

Chert (Flint)

Microcrystalline Quartz (SiO2)

Pink Spinel

Magnesium Aluminum Oxide (MgAl2O4)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chalcedony (Common Opal variant or Agate)

Silicon Dioxide (SiO2)