Organic Gemstone (Not A Mineral)

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Amethyst

Silicon Dioxide with Iron impurities (SiO2)

Beryl (Aquamarine) in Matrix with Schorl

Be3Al2Si6O18 (Beryl) with NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)

Granitic Pegmatite

Pegmatite (composed primarily of Quartz, Feldspar, and Muscovite mica)

Opal (Precious Opal)

Hydrated Silica (SiO2·nH2O)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Chalcedony

Chalcedony (SiO2)

Charoite

Charoite, K(Ca,Na)2Si4O10(OH,F)·H2O

Geode (Quartz chalcedony variety)

SiO2 (Silicon Dioxide)

Olivine (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Red Jasper

Jasper (Silicate mineral - SiO2)

Malachite

Malachite (Copper Carbonate Hydroxide, Cu2CO3(OH)2)

Fuchsite

K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)

White Sapphire

Corundum (Al2O3)

Amethyst

Silicon Dioxide (SiO2) with trace Iron (Fe) impurities

Labradorite

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

Corundum (Sapphire variant)

Aluminium oxide (Al2O3)

Carnelian

Carnelian (Silicon Dioxide, SiO2)

Rhodonite

Rhodonite (Manganese Silicate), (Mn,Fe,Mg,Ca)SiO3

Amethyst

Silicon Dioxide with Iron impurities (SiO2)

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Epidote

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

Larimar

Pectolite (Sodium Calcium Silicate Hydroxide) - (NaCa2(Si3O8)(OH))

Peridot

Olivine ((Mg, Fe)2SiO4)

Green Kyanite

Kyanite (Al2SiO5)

Labradorite

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

Smoky Quartz

Silicon Dioxide (SiO2)

Citrine

Silicon Dioxide (SiO2) with ferric iron impurities

Turquoise

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

Smoky Quartz

Silicon Dioxide (SiO2)

Smoky Quartz

Smoky Quartz (Silicon Dioxide, SiO2)

Epidote

Epidote - {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Pyrite (on Quartz/Host Rock)

Iron Sulfide (FeS₂)

Strawberry Quartz

Quartz (SiO2) with inclusions of Goethite or Hematite

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

Sunstone

Heliolite (Oligoclase or Orthoclase Feldspar), (Ca,Na)(Al,Si)4O8

Rough Citrine Quartz

Silicon Dioxide (SiO2) with ferric iron impurities

Amethyst (Quartz)

SiO2 (Silicon Dioxide)

Almandine Garnet

Almandine, Fe3Al2(SiO4)3

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Eudialyte

Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2