Limestone

Galena

Lead(II) sulfide (PbS)

Chert (Flint)

Chert (Microcrystalline Silicon Dioxide, SiO2)

Jasper Chert Nodules

Silicon Dioxide (SiO2) with Hematite impurities

Chert / Flint

Microcrystalline Quartz (SiO2)

Flint

Chert (Silicon dioxide, SiO2)

Blue Calcite

Calcite (Calcium Carbonate, CaCO3)

Chert (variously known as Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fighting Conch (Sea Shell)

Strombus alatus (primarily composed of Calcium Carbonate / CaCO3)

Rough Emerald Crystals

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Fluorite

Calcium Fluoride (CaF2)

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Emerald

Beryl (Be3Al2(SiO3)6) colored by Chromium and/or Vanadium

Chert (Flint)

Microcrystalline Quartz (SiO2)

Travertine

Calcareous Tufa / Travertine (CaCO3)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

Lapis Lazuli

Lapis Lazuli (Rock containing Lazurite, Calcite, and Pyrite)

Chert (White Chert)

Silicon Dioxide (SiO2)

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Chert (Jasper)

Cryptocrystalline Quartz (SiO2)

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Lapis Lazuli

Lapis Lazuli (Complex aggregate containing Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

Chert (specifically Flint or Nodular Chert)

Silicon Dioxide (SiO2)

Chert (specifically Iron-stained or Jasperoid Chert)

Microcrystalline Quartz (SiO2)

Green Calcite

Calcium Carbonate (CaCO3)

Limestone with Calcite Veining

Calcium Carbonate (CaCO3)

Quartzite Pebble

Metamorphic Quartzite (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Limestone River Pebble

Sedimentary Calcium Carbonate (CaCO3)

Calcite

Calcium Carbonate (CaCO3)

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

Calcite

Calcium Carbonate (CaCO3)

Chert (Nodular Chert)

Microcrystalline Quartz (SiO2)

White Marble

Recrystallized Calcite (CaCO3)

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Coquina / Limonite-stained Limestone

Sedimentary Limestone with Iron Oxyhydroxide (FeO(OH)·nH2O)

Chert (Jasper/Flint variety)

Microcrystalline quartz (SiO2)

Lapis Lazuli

Lapis Lazuli (a rock composed primarily of Lazurite (Na,Ca)₈[(S,Cl,SO₄,OH)₂|(Al₆Si₆O₂₄)], with varying amounts of Calcite, Pyrite, and Sodalite.)

Chert (Flint)

SiO2 (predominantly microcrystalline or cryptocrystalline quartz)

Chalcedony (Chert/Flint variety)

Silicon Dioxide (SiO2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)