Mineral And Organic Gemstone

Citrine

Silicon Dioxide (SiO2)

Citrine

Silicon dioxide (SiO2)

Ametrine

Ametrine (SiO2 - Silicon Dioxide with varied iron impurities)

Agate Geode Slice (with Druzy Quartz)

Silicon Dioxide (SiO2)

Citrine or Yellow Quartz

Silicon Dioxide (SiO2) with iron impurities

Peridot (Olivine)

Olivine ((Mg, Fe)2SiO4)

Vesuvianite (Idocrase)

Ca19(Al, Mg, Fe)13(SiO4)10(Si2O7)4(OH, F, O)10

Jasper (Iron-stained Chert)

Silicon Dioxide (SiO2) with impurities of Hematite or Goethite

Petrified Wood

Silicified Wood (SiO2)

Granite Pegmatite with Tourmaline and Muscovite

Pegmatite (Feldspar: KAlSi3O8, Quartz: SiO2, Schorl: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH))

Goethite (likely as part of Limonite/Ironstone)

Goethite (α-FeOOH)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Lapis Lazuli

Lapis lazuli (a rock primarily composed of Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Fluorite

Calcium Fluoride (CaF2)

Chert (and/or Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Rhodonite

Rhodonite (Mn,Fe,Mg,Ca)SiO3

Citrine (Heat-treated Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Quartz (Citrine or Smoky variant)

Silicon Dioxide (SiO2)

Quartz (Clear/White)

Silicon Dioxide (SiO2)

Oceanside Agate (Orbicular Agate)

Silicon Dioxide (SiO2) - Variety of Chalcedony

Turquoise

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

Baltic Amber (Butterscotch or Egg Yolk Variety)

Succinite (C10H16O)

Petrified Wood

Silicified Wood (primarily SiO₂ - Silicon Dioxide)

Precious Opal in Matrix

Hydrated Silica (SiO2·nH2O)

Pyrite

Iron Sulfide (FeS2)

Turquoise (Rough)

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

Sodalite

Sodalite (Sodium Aluminum Silicate Chloride), Na8(Al6Si6O24)Cl2

Chert (Iron-stained)

Chert (primarily Microcrystalline Quartz, SiO2)

Olivine (Peridot)

Magnesium Iron Silicate (Mg, Fe)2SiO4

Amazonite

K(AlSi3O8), Microcline (potassium feldspar)

Jasper

Jasper (Silicon Dioxide, SiO2)

Kyanite in Quartz

Kyanite (Al2SiO5) with Quartz (SiO2)

Chert (specifically Gray/Blue Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Brecciated or Veined)

Silicon Dioxide (SiO2)

Chert (with Quartz vein)

Chert (Silicon Dioxide, SiO2)

Precious Opal

Hydrated Silica (SiO2·nH2O)

Cavansite

Cavansite (Ca(VO)Si4O10·4H2O)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)

Epidote in Quartz (Unakite-like specimen)

Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)) in Quartz (SiO2)

Mookaite Jasper

Radiolarite (Silicon Dioxide, SiO2)