Limestone

Chert / Flint

Microcrystalline Silica (SiO2)

Green Calcite

Calcium Carbonate (CaCO3)

Chert (Yellow/Brown variety)

Chert (SiO2)

Chert (including Common Opal and Chalcedony)

Silicon Dioxide (SiO2 · nH2O)

Sodalite

Na8(Al6Si6O24)Cl2

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Banded Agate (Chert/Chaldcedony)

Silicon Dioxide (SiO₂)

Blue Calcite

Calcium Carbonate (CaCO3)

Red Chert (Jasper)

Cryptocrystalline Quartz (SiO2) with iron oxide inclusions

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert

Microcrystalline Quartz (SiO2)

Nephrite Jade

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

Charoite

Charoite; (K,Sr,Ba,Ca)15-16(Na,Ca)8(Si,Al)24O60(OH,F)4·nH2O

Malachite

Malachite, Cu2(CO3)(OH)2

Crazy Lace Agate

Agate (Cryptocrystalline Quartz), SiO2

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Lapis Lazuli

Lapis Lazuli (Primary mineral: Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)

Chert (often called Flint)

Chert (SiO2)

Chalcedony Nodule (Agate/Chert)

Chalcedony (cryptocrystalline Silicon Dioxide, SiO2)

Chert (Basanite / Flint variety)

Microcrystalline Quartz (SiO2)

Chert (or Flint)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert (White Flint)

Microcrystalline Quartz (SiO2)

Fluorite (often called Rainbow Fluorite or Purple-Green Fluorite)

Calcium Fluoride (CaF2)

Celestite (Celestine)

Strontium sulfate (SrSO4)

Hag Stone

Perforated Flint or Chert (SiO2)

Chert (Basanite / Jasper)

Microcrystalline quartz (SiO2)

Galena

Lead(II) sulfide (PbS)

Glass Nugget (Tumbled Glass)

Amorphous Silicon Dioxide (SiO2) with additives

Oyster Shell (Aragonite/Calcite)

Calcium Carbonate (CaCO3)

Lapis Lazuli

Na8[Al6Si6O24]n(S,Cl,SO4,OH)2

Yellow Calcite

Calcium Carbonate (CaCO3)

Chert (Flint)

Silicon Dioxide (SiO2)

Tiffany Stone

Fluoritized Opal Beryllium Ore (principally Bertrandite, Be4Si2O7(OH)2)

Chrysanthemum Stone

Celestine (SrSO4) or Calcite (CaCO3) in Limestone/Porphyry matrix

Orthoceratid Fossil in Limestone

Orthoceras (extinct genus of Nautiloid Cephalopod)

Chert (and Chert-based Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2)

Chert (Chert / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fossilized Gastropod in Chert/Limestone

Internal mold of Gastropoda (Class) with CaCO3 or SiO2 mineral formula

Fossil Shell (Bivalve)

Class Bivalvia (Likely a member of the Ostreidae or Gryphaeidae family), CaCO3