Mineral (Gemstone)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Azurite and Malachite

Azurite (Cu3(CO3)2(OH)2) and Malachite (Cu2(CO3)(OH)2)

Amazonite

K(AlSi3O8) - Microcline variant

Aquamarine

Beryl (Be3Al2Si6O18 with iron impurities)

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Labradorite (Feldspar)

Labradorite: (Ca,Na)(Al,Si)4O8

Turquoise

Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O

Smoky Quartz Cluster

Smoky Quartz (Silicon Dioxide - SiO2)

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

Prehnite

Prehnite Ca2Al2Si3O10(OH)2

Black Star Diopside

Diopside (CaMgSi2O6) with asterism

Pink Tourmaline in Quartz Matrix

Elbaite (Na(Li,Al)3Al6(Si6O18)(BO3)3(OH)4) in Quartz (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Rough Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Dolomite on Prehnite (Saddle-shaped Dolomite)

Dolomite [CaMg(CO3)2] on Prehnite [Ca2Al(AlSi3O10)(OH)2]

Rough Emerald/Green Beryl

Beryl (Be3Al2(SiO3)6) with trace amounts of Chromium or Vanadium

Amazonite

Triklinic Potassium Feldspar (KAlSi3O8)

Amethyst

Silicon Dioxide (SiO2 with iron impurities)

Pyrite (Iron Pyrites)

Iron Sulfide (FeS2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Orthoclase Feldspar (Salmon variety)

Orthoclase, KAlSi3O8

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Amethyst

Silicon Dioxide (SiO2) with Iron impurities

Chrysocolla

Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)

Garnet (Almandine)

Almandine (Fe3Al2(SiO4)3)

Blue Kyanite

Kyanite (Al2SiO5)

Pyrite in Quartz

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Turquoise

Hydrated phosphate of copper and aluminum; CuAl6(PO4)4(OH)8·4H2O

Peridot

Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Black Obsidian

Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)

Tiger's Eye

SiO2 (Silicon Dioxide with iron inclusions)

Schorl (Black Tourmaline)

Sodium Iron Aluminum Borosilicate Hydroxide - NaFe2+3Al6Si6O18(BO3)3(OH)3OH

Unakite (Tumbled)

Epidotized Granite

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky/Crystalline variety)

Silicon Dioxide (SiO2)

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Diamond (or Lab-Grown Cubic Zirconia)

Carbon (C)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Turquoise, Pearl, and Coral Necklace

CuAl6(PO4)4(OH)8·4H2O (Turquoise) / CaCO3 (Pearl and Coral)