Crystal

Blue Sapphire

Corundum (Al2O3 with trace Titanium and Iron)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Amethyst

Amethyst (variety of Quartz, SiO2)

Aquamarine

Beryl (Be3Al2Si6O18)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Granite

Phaneritic plutonic rock (Quartz, Feldspar, Mica)

Quartz / Quartzite

Silicon Dioxide (SiO2)

Quartz on Matrix

Silicon Dioxide (SiO2)

Amethyst

Amethyst (Silicon Dioxide - SiO2 with iron impurities)

Milky Quartz

Silicon Dioxide (SiO2)

Blue Sapphire (Tumbled/Polished)

Corundum (Al2O3)

Vanadinite

Vanadinite (Pb5(VO4)3Cl)

Galena

Lead(II) sulfide (PbS)

Granite

Granite

Amethyst (variety of Quartz)

SiO2 (Silicon Dioxide)

Ametrine

SiO2 (silicon dioxide)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Black Tourmaline (Schorl)

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

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Celestine (or Celestite) on Matrix

Celestine (SrSO4)

Fluorite

Calcium Fluoride (CaF2)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Hematite

Iron(III) oxide (Fe2O3)

Limonite with Iron Inclusions

Limonite (Hydrated Iron Oxide, FeO(OH)·nH2O)

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Aquamarine

Beryl (Be3Al2Si6O18 with iron traces)

Milky Quartz

Silicon Dioxide (SiO2)

Fuchsite Schist

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

Orange Calcite

Calcium Carbonate (CaCO3)

Fluorite

Fluorite (Calcium Fluoride, CaF2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Schist

Mica Schist

Rough Diamond

Carbon (C)

Quartz

Quartz (SiO₂)