Sedimentary

Yellow Jasper (Chert variant)

Silicon Dioxide (SiO2) with iron oxide inclusions

Kyanite (Green and Blue varieties)

Kyanite (Al2SiO5)

White Zircon

Zircon (Zirconium silicate, ZrSiO4)

Carnelian Agate

Silicon Dioxide (SiO2) - Variety of Chalcedony

White Calcite

Calcium Carbonate (CaCO3)

Epidote

Epidote (Ca2(Al,Fe)3(SiO4)3(OH))

Green Calcite

Calcium Carbonate (CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Carnelian

Carnelian (SiO2 - Silicon Dioxide)

Blue Calcite

Calcium Carbonate (CaCO3)

Green Aventurine

Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Yellow Agate / Chalcedony

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Magnetite (potentially Hematite-rich)

Magnetite (Fe3O4)

Hematite

Iron(III) oxide (Fe2O3)

Quartz (Milky or Citrine-tinted)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified wood (primarily SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Magnetite / Iron Ore

Magnetite (Fe3O4)

Chalcedony with inclusions (Agate/Quartz)

Silicon Dioxide (SiO2)

Carnelian (Orange Chalcedony)

Silicon Dioxide (SiO2) with iron oxide impurities

Quartz Geode (with possible Manganese or Goethite coating)

Silicon Dioxide (SiO2)

Chert / Flint

Chert (SiO2)

Chert (Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Bumblebee Jasper

Volcanic Tuff (mixture of Quartz, Sulfur, Hematite, and Orpiment)

Ruby in Kyanite

Al2O3 (Corundum) in Al2SiO5 (Kyanite-Fuchsite-Quartz)

Quartz Geode

Silicon Dioxide (SiO2) in a Secondary Formation

Quartz Vein / Milky Quartz

Silicon Dioxide (SiO2)

Green Calcite

Calcium Carbonate (CaCO3)

Green Calcite

Calcium Carbonate (CaCO3)

Jasper

Silicon dioxide (SiO2)

Chalcedony (Moonstone variant or White Agate)

Silicon Dioxide (SiO₂)

Biotite Gneiss

Gneiss (complex mixture including Biotite K(Mg,Fe)3AlSi3O10(F,OH)2 and Quartz/Feldspar)

Imperial Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz with Mineral Inclusions

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Red Jasper

Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)

Pyrite in Shale

Iron Sulfide (FeS2)

Ammonite Fossil (Polished Half / Cleoniceras)

Ammonoidea (Subclass), often Cleoniceras genus; fossilized with Calcite (CaCO3) and Aragonite

Pyrite in Quartz

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)

Yellow Calcite (Banded Calcite)

Calcium Carbonate (CaCO3)