Mineral Specimen

Beryllonite

Beryllonite (NaBePO4)

Amethyst

Quartz (SiO2) with trace iron impurities

Pink Tourmaline (Rubellite)

Rb:Na(Li,Al)3Al6(BO3)3Si6O18(OH)4 (Elbaite variety)

Anthracite Coal

Anthracite (Carbon-rich metamorphic coal)

Celadonite in Amygdaloidal Basalt

K(Mg,Fe2+)(Fe3+,Al)Si4O10(OH)2 (Celadonite mineral) within a Basalt matrix

Arsenic (Native)

Arsenic (As)

Rough Emerald/Green Beryl

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

Quartz with Mica (Gneissic or Pegmatitic origin)

Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(F,OH)2)

Quartz with Mica/Chlorite inclusions

Silicon Dioxide (SiO2) with phyllosilicate inclusions

Rhodochrosite

Manganese Carbonate (MnCO3)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Biotite (Black Mica)

Biotite - K(Mg,Fe)3(AlSi3O10)(OH)2

Bixbyite on Rhyolite

Bixbyite (Mn2+,Fe3+)2O3

Rough Quartz Crystal in Matrix

Silicon Dioxide (SiO2)

Granite Cobble

Phaneritic Plutonic Felsic Rock

Yellow Jasper

Silicon Dioxide (SiO2) - variety Jasper

Fluorite

Calcium Fluoride (CaF2)

Specular Hematite (Specularite)

Iron Oxide (Fe2O3)

Specular Hematite and Magnetite Ore

Iron Oxide (Fe2O3 and Fe3O4)

Celestite (Celestine)

Strontium Sulfate (SrSO4)

Pyrite

Iron Sulfide (FeS2)

Aquamarine

Beryl (Be3Al2Si6O18 with iron impurities)

Granite

Granite (a felsic intrusive igneous rock)

Smoky Quartz

SiO2 (Silicon Dioxide)

Botryoidal Hematite (Iron Ore)

Iron(III) oxide (Fe2O3)

Kyanite (Green and Blue varieties)

Kyanite (Al2SiO5)

Green Fluorite

Calcium Fluoride (CaF2)

Native Copper with Malachite and Chrysocolla

Native Copper (Cu) with Malachite [Cu2CO3(OH)2] and Chrysocolla [(Cu,Al)2H2Si2O5(OH)4·nH2O]

Mixed Gemstone Bracelet

Mixed natural minerals and rocks (e.g., Rhodonite, Malachite, Sodalite, Rose Quartz, Black Tourmaline, Quartz/Chalcedony variants)

Staurolite (Cross Stone)

Staurolite (Fe2+2Al9Si4O23(OH))

Azurite in Gossan

Azurite (Cu3(CO3)2(OH)2) in Limonite/Goethite matrix

Citrine Quartz

Crystalline Silicon Dioxide (SiO2) with Ferric Iron impurities

Chalcedony (Botryoidal)

Silicon Dioxide (SiO2)

Amethyst

Amethyst (Silicon Dioxide with iron impurities, SiO2)

Nephrite (a form of Jade)

Nephrite (a variety of the mineral actinolite, Ca2(Mg,Fe)5Si8O22(OH)2)

Moonstone (bead form)

Potassium Aluminum Silicate (KAlSi3O8) - a variety of Orthoclase Feldspar

Celestite (Celestine)

Strontium sulfate (SrSO4)

Stichtite in Serpentine (Atlantisite)

Mg6Cr2CO3(OH)16·4H2O (Stichtite) / Mg3Si2O5(OH)4 (Serpentine)

Rhodochrosite

Manganese Carbonate (MnCO3)

Lazulite

Lazulite (Mg,Fe2+)Al2(PO4)2(OH)2

Fluorite

Fluorite (Calcium Fluoride, CaF2)

Aragonite Star Cluster

Aragonite (Calcium Carbonate, CaCO3)