Mixed (Predominantly Sedimentary And Igneous)

Diamond

Diamond (pure Carbon, C)

Carnelian

Carnelian (Silicon Dioxide, SiO2)

Amethyst

Silicon Dioxide with Iron impurities (SiO2)

Amber

Succinite

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Amber

Succinite (a common variety of fossilized resin)

Amethyst

SiO2 (Silicon Dioxide)

Green Aventurine

Aventurine Quartz (SiO2 + Fuchsite mica)

Amethyst (Tumbled/Weathered Quartz)

Amethyst (SiO2 with iron impurities)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)

Lepidolite and Rubellite (Pink Tourmaline) in Quartz

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lepidolite) and Na(Li,Al)3Al6(BO3)3Si6O18(OH)4 (Elbaite/Pink Tourmaline)

Opalite (a synthetic glass, often confused with Opal)

Silicon dioxide glass (SiO2nH2O, for natural opal)

Jadeite (Jade)

Jadeite; NaAlSi2O6

Black Onyx

Black Chalcedony (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Brown Agate

Silicon Dioxide (SiO2)

Quartz

Silicon dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Milky Quartz

Silicon Dioxide (SiO2)

Pyrite in Matrix (likely Quartz or Schist matrix)

Iron Sulfide (FeS2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Clear / Rock Crystal)

Silicon Dioxide (SiO2)

Blue Calcite

Calcium Carbonate (CaCO3)

Carnelian

Carnelian (a variety of Chalcedony), SiO2 (Silicon Dioxide)

Quartz

Silicon Dioxide (SiO2)

Banded Agate (specifically Carnelian Agate slice)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Gneiss

High-grade regional metamorphic rock (Foliated)

Rough Quartz (likely Rose or Smoky variant)

Silicon Dioxide (SiO2)

Yellow Agate

Agate (Varietal form of Chalcedony/Quartz, SiO2)

Blue Apatite

Apatite (Ca5(PO4)3(F,Cl,OH))

Apatite

Fluorapatite, Chlorapatite, and Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))

White Zircon

Zircon (Zirconium silicate, ZrSiO4)

White Calcite

Calcium Carbonate (CaCO3)

Epidote

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

Blue Calcite

Calcium Carbonate (CaCO3)

Yellow Agate / Chalcedony

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)