Limestone

Chert (often referred to as Flint or Jasper when pigmented)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Chert (Flint Nodules)

Microcrystalline Quartz (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Chert (Common Opal or Chalcedony)

Microcrystalline Quartz (SiO2)

Limestone with Calcite Veins

Sedimentary Calcium Carbonate (CaCO3)

Calcite

Calcium Carbonate (CaCO3)

Chert (often called Flint)

Chert (Cryptocrystalline Silica, SiO2)

Chert (specifically Yellow/Common Opal or Jasper mixture)

Silicon Dioxide (SiO2)

Marble

Metamorphic rock composed of Recrystallized Carbonate Minerals (chiefly CaCO3)

Chert Nodule

Microcrystalline Quartz (SiO2)

Crazy Lace Agate

Chalcedony (SiO2)

Chert Nodule

Microcrystalline Quartz (SiO2)

Chert (Banded)

Microcrystalline Quartz (SiO2)

Lapis Lazuli

Lapis Lazuli (Rock composed primarily of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Chert / Flint

Silicon Dioxide (SiO2)

Chert (Flint)

Chert (SiO2)

Geode or Concretion

Silica-rich Concretion or Unopened Geode (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Lapis Lazuli

Lapis Lazuli (Complex silicate mixture containing Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Quartz (Chert/Chunky Chalcedony)

Silicon Dioxide (SiO2)

Lapis Lazuli

Lapis Lazuli (Complex silicate mineral mix including Lazurite, Pyrite, and Calcite)

Geode (Unopened)

Crystalline Quartz or Chalcedony filled Geode (SiO2)

Chert (Flint Nodule)

Microcrystalline or cryptocrystalline quartz (SiO2)

Green Chert

Microcrystalline Quartz (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Sodalite

Sodalite (Sodium Aluminum Silicate Chloride) - Na8(Al6Si6O24)Cl2

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Flint (Chert Node)

Silicon Dioxide (SiO2)

Chert (specifically Flint or Dark Chert)

Silicon Dioxide (SiO2)

Pyrite Geode

Iron Disulfide (FeS2)

Barite

Barium Sulfate (BaSO4)

Calcite (Optical or Clear Calcite)

Calcium Carbonate (CaCO3)

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Lapis Lazuli (polished cabochon/sphere)

Na8[Al6Si6O24]Sn with accessory minerals (Pyrite, Calcite)

Chert (Yellow/Tan)

Microcrystalline Quartz (SiO2)

Optical Calcite (Iceland Spar)

Calcite (Calcium Carbonate, CaCO3)

Lapis Lazuli

Lapis lazuli (a rock primarily composed of Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Septarian Nodule (Dragon Stone)

Septarian Concretion (Calcite, Aragonite, and Limestone/Clay)

Septarian Nodule (Septaria)

Septarian Nodule (Calcium Carbonate/Aragonite/Calcite Concretion)

Septarian Nodule

Septarian Nodule (Mixture of Calcite, Aragonite, and Limestone/Clay)