Limestone

Orthoceras Fossil in Limestone

Orthoceras (extinct genus of cephalopods), mineralized as Calcite (CaCO3) in Fossiliferous Limestone

Tufa (Vesicular Limestone)

Tufa (form of Calcium Carbonate, CaCO3)

Coquina / Fossiliferous Limestone

Coquina (composed primarily of Calcium Carbonate / CaCO3)

Fossiliferous Limestone (with Crinoids)

CaCO3 (Calcium Carbonate)

Coquina or Fossiliferous Limestone

Fossiliferous Calcarenite (CaCO3)

Chert (specifically Blue Chert/Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (varieties include Flint and Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Nephrite Jade

Ca2(Mg, Fe)5Si8O22(OH)2 (Tremolite-Actinolite series)

White Sapphire

Corundum (Al2O3)

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Chert (Jasper variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (containing fossil leaf impression)

Microcrystalline silicon dioxide (SiO2)

Quartz Geode

Silicon dioxide (SiO2)

Chert Nodule (River Cobble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (often called Flint or Jasper)

Silicon Dioxide (SiO2)

Banded Chert

Microcrystalline silicon dioxide (SiO2)

Chert (varieties include Flint and Jasper)

Silicon Dioxide (SiO2)

White Marble (Tumbled)

Recrystallized Calcite (CaCO3)

Chert (Black Chert/Flint)

Silicon Dioxide (SiO2)

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Marble

Recrystallized Carbonate Rock (CaCO3)

Veined Limestone (Micrite) with Quartz/Calcite Veins

Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions

Fossiliferous Limestone with Rugose Coral

Calcite (CaCO3) matrix containing Rugosa (order of extinct solitary and colonial corals)

Green Fluorite in Host Rock

Fluorite (Calcium Fluoride, CaF2)

Lapis Lazuli

Complex mixture containing Lazurite ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2), Calcite, and Pyrite

Concrete

Hydrated Portland Cement Aggregate Composite

Lapis Lazuli (Tumbled Stone)

Na6Ca2(Al6Si6O24)(SO4,S,Cl)2 (predominantly Lazurite)

Chert (Flint Nodules)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Lapis Lazuli

Lapis Lazuli (Complex aggregate mainly of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Green Onyx (Banded Calcite)

Calcite (Calcium Carbonate, CaCO3)

Malachite

Copper carbonate hydroxide, Cu2CO3(OH)2

Blue Calcite

Calcium Carbonate (CaCO3)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Black Spinel

Magnesium Aluminum Oxide (MgAl2O4)

Chert (Flint Nodules)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Pink Calcite (Mangano Calcite)

Calcium Carbonate (CaCO3)

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Rainbow Fluorite

Fluorite (Calcium Fluoride, CaF2)

Zinc Ore (Sphalerite in Matrix)

Sphalerite (Zn,Fe)S within a carbonate or silicate host rock

Chert (Jasper variety)

Silicon Dioxide (SiO2)