Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Category
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Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Dyed Agate
SiO2 (Silicon Dioxide)
mineral
Black Opal
Amorphous hydrated silica (SiO2 nH2O)
mineral
Granite
Granite (Felsic Intrusive)
igneous
Granite
Granite
igneous
Citrine
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon dioxide (SiO2) with iron impurities
mineral
Smoky Quartz
Smoky Quartz (Silicon Dioxide, SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
mineral
Quartz (Citrine variety)
Silicon Dioxide (SiO2)
mineral
Chert (Jasper/Flint var.)
Silicon Dioxide (SiO2)
sedimentary
Citrine
SiO2 (Silicon Dioxide)
mineral
Smoky Quartz
Silicon dioxide (SiO2)
Mineral
Quartz (Smoky Quartz)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Citrine
Silicon Dioxide (SiO2) with iron impurities
mineral
Diamond
Carbon (C)
gemstone
Dyed Dragon Vein Agate
Silicon Dioxide (SiO2) with artificial dye
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Orange cabochon gemstone, likely amber or amber-like resin
Natural amber: fossilized plant resin (organic mineraloid), commonly succinite; exact identification requires testing
gemstone
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Chert
Chert (SiO2)
sedimentary
Green Aventurine
Silicon Dioxide (SiO2+KAl2(AlSi3O10)(OH)2)
metamorphic
Quartz (Smoky/Grey Variety)
Silicon Dioxide (SiO2)
mineral
Mineral Sand (Heavy Mineral Sand Concentrate)
Placer deposit concentrate containing minerals such as ilmenite, rutile, zircon, and magnetite
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Natural Freshwater Pearl
Calcium Carbonate (Aragonite and Calcite), CaCO3
gemstone
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Red Quartzite
Quartzite (Metamorphosed Quartz Arenite)
metamorphic
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Diamond
Carbon (C)
gemstone
Diamond (or Cubic Zirconia)
Carbon (C) / Cubic Zirconium Dioxide (ZrO2)
mineral
Chert (often called Flint or River Stone)
Microcrystalline alpha-quartz (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Amethyst
Silicon Dioxide (SiO2)
mineral
Amethyst (Raw)
Amethyst (Silicon Dioxide with Iron impurities, SiO2)
mineral
Obsidian
Obsidian (Volcanic Glass) SiO2 (70% or more)
igneous