Amethyst Cluster
Quartz (Silicon Dioxide, SiO2)
gemstone
Category
Mineral, Jewelry
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Amethyst
Quartz (SiO2)
mineral
Aura Quartz (Coated Quartz)
Silicon Dioxide (SiO2) coated with vaporized metals
mineral
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Lake Superior Agate
Silicon Dioxide (Chalcedony variety)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Emerald
Beryl (Be3Al2(SiO3)6)
gemstone
Quartz (Quartzite or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Amethyst Cluster
Silicon Dioxide with Iron impurities (SiO2)
mineral
Quartz (Yellow Quartz / Citrine / Calcite)
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)
mineral
Yellow Quartz (Citrine / Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Chalcedony (Yellow/Brown Agate Pebble)
Silicon Dioxide (SiO2)
mineral
Petrified Coral (Agatized Coral)
Fossilized Anthozoa (Silicon Dioxide replacement - SiO2)
fossil
Quartz (Smoky Quartz / Chalcedony)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz with Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chrysoprase
Silicon Dioxide with Nickel inclusions (SiO2)
gemstone
Botryoidal Chalcedony / Opal
Silicon Dioxide (SiO2 · nH2O)
mineral
Amethyst
Silicon Dioxide (SiO2 with iron impurities)
mineral
Agate (Brecciated / Moss Agate with Jasproid Inclusions)
Silicon Dioxide (SiO2)
mineral
Golden Healer Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite inclusions
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Pyrite
Iron Sulfide (FeS2)
mineral
Aquamarine
Beryl (Be3Al2(SiO3)6)
gemstone
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Picture Jasper
SiO2 (Microcrystalline Quartz / Chalcedony with iron oxide impurities)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Yellow Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Aquamarine
Beryl (Be3Al2(SiO3)6)
gemstone
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Sugilite
KNa2(Fe,Mn,Al)2Li3Si12O30
mineral
Amethyst
Quartz (Silicon Dioxide with iron impurities, SiO2)
mineral
Amazonite
K(AlSi3O8) (Microcline Feldspar)
mineral
Amethyst
Silicon Dioxide (SiO2) with trace Iron (Fe3+)
mineral
Amazonite
Microcline (KAlSi3O8) with lead impurities
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
gemstone
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Amazonite
Microcline (variety Amazonite), K(AlSi3O8)
mineral