Mineral, Jewelry

Pearl

Calcium carbonate (CaCO3) + organic conchiolin (Biogenic Mineral)

Tiger's Eye

Tiger's Eye (SiO2 with crocidolite inclusions)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Pyrite in Quartzite/Graphite Matrix

Iron Sulfide (FeS2)

Arfvedsonite (often mistakenly sold as Astrophyllite)

Arfvedsonite [Na3(Fe2+)4Fe3+Si8O22(OH)2]

Carnelian Agate

Chalcedony (Silicon Dioxide, SiO2)

Amazonite (Tumbled Chips)

Potassium Feldspar (KAlSi3O8)

Purple Agate (Dyed Chalcedony)

SiO2 (Silicon Dioxide) with organic dyes

Dalmatian Jasper

Peralkaline rhyolite with Arfvedsonite inclusions

Turquoise (Dyed Howlite or Magnesite imitation)

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

Nephrite Jade

Ca2(Mg, Fe)5Si8O22(OH)2

Carnelian (Red Agate/Chalcedony)

Cryptocrystalline Quartz (SiO2) with Hematite impurities

Jasper

Jasper (Silicate mineral, SiO2)

Chert (Jasper variation)

Chert (Silicate mineral, SiO2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Clear Quartz

SiO2 (Silicon Dioxide)

Tiffany Stone

Fluorite Opal (a complex mix of Fluorite, Opal, Calcite, Dolomite, Quartz, and Bertrandite)

Fossilized Shark Tooth (Basal Bone)

Otodus sp. (Mineralized Hydroxyapatite)

Gold Ore in Quartz

Auriferous Quartz (Au + SiO2)

Silver (Sterling Silver Jewelry)

Argentum (Ag) mixed with Copper (Cu)

Sandstone or Mudstone with Iron Staining

Ferruginous Sandstone/Mudstone

River Stone / Pebble

Clastic Sediment (composed largely of Quartz, Feldspar, and various rock fragments)

Green Aventurine

SiO2 (Silicon Dioxide with inclusions of Fuchsite mica)

Blue Chalcedony

Silicon Dioxide (SiO2)

Botryoidal Hematite (Iron Stone Conglomerate)

Hematite (Fe2O3) in sedimentary matrix

Blue Kyanite

Kyanite (Al2SiO5)

Green Aventurine

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

Chrysocolla (with Quartz and Azurite)

Hydrated copper phyllosilicate mineral [Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)]

Chrysocolla

Hydrated copper phyllosilicate, Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)

Amethyst

Silicon Dioxide (SiO2) with trace Iron (Fe3+)

Barite Rose on Marcasite

Barium Sulfate (BaSO4) on Iron Sulfide (FeS2)

Lepidolite

Lepidolite [K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2]

Hematite (Iron Ore)

Hematite (Fe2O3)

Malachite

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

Pyrite (Iron Pyrites)

Iron Sulfide (FeS2)

Prehnite on Basalt

Prehnite - Ca2Al(AlSi3O10)(OH)2

Diamond in Kimberlite

Kimberlite Matrix with Carbon (Diamond)

Amazonite

Microcline (variety Amazonite), K(AlSi3O8)

Pyrite (on Quartz/Host Rock)

Iron Sulfide (FeS₂)

Diamond (or Cubic Zirconia)

Crystallized Carbon (C) for Diamond; Zirconium Dioxide (ZrO2) for CZ

Pyrite

Iron Sulfide (FeS2)

Garden Quartz

Included Quartz (SiO2 with accessory minerals such as Chlorite, Hematite, or Feldspar)