Amethyst
Silicon Dioxide (SiO2)
mineral
Category
Mineral, Jewelry
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Banded Agate
Silicon Dioxide (SiO2)
sedimentary
Agate Geode
Silicon dioxide (SiO2)
sedimentary
Amazonite and Smoky Quartz
KAlSi3O8 and SiO2
mineral
Amazonite
Microcline feldspar (KAlSi3O8)
mineral
Jasper
Silicon Dioxide (SiO2)
sedimentary
Amazonite
Microcline feldspar (KAlSi3O8)
mineral
Botryoidal Hematite
Iron Oxide, Fe2O3
mineral
Blue Topaz
Aluminum silicate fluoride hydroxide, Al2SiO4(F,OH)2
gemstone
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Amethyst
Silicon Dioxide (SiO2)
mineral
Sugilite
KNa2(Fe,Mn,Al)2Li3Si12O30
mineral
Botryoidal Chalcedony
Silicon Dioxide (SiO2)
mineral
Aquamarine
Beryllium Aluminum Silicate, Be3Al2(SiO3)6
gemstone
Raw Citrine
Silicon Dioxide (SiO2)
mineral
Amethyst
Quartz (Silicon Dioxide, SiO2)
mineral
Opal
Hydrated amorphous silica (SiO2·nH2O)
mineral
Amethyst
Quartz (SiO2)
gemstone
White Opal
Hydrated amorphous silica (SiO2·nH2O)
gemstone
Red Jasper with Quartz Vein
Microcrystalline quartz (SiO2)
sedimentary
Amethyst
Quartz (Silicon Dioxide, SiO2)
gemstone
Emerald in Matrix
Beryl (Be3Al2(SiO3)6)
gemstone
Amethyst geode
Amethyst, purple variety of quartz (SiO₂), lining a geode
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Blue Quartz
Silicon Dioxide (SiO2) with inclusions
mineral
Imperial Topaz
Aluminum Silicate Fluoride Hydroxide, Al2SiO4(F,OH)2
gemstone
Amazonite
Microcline feldspar, KAlSi3O8
mineral
Sugilite in Quartz
KNa2(Fe,Mn,Al)2Li3Si12O30
mineral
Amazonite
Microcline feldspar (KAlSi3O8)
mineral
Tumbled amethyst
Quartz, SiO₂; purple color from trace iron and natural irradiation
mineral
Amethyst geode cluster
Quartz (SiO₂), purple variety amethyst, with a banded agate/chalcedony center
mineral
Amethyst
Quartz (Silicon Dioxide, SiO2)
gemstone
Likely tumbled turquoise
Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Carnelian Agate
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Green Quartz
Silicon Dioxide (SiO2)
mineral
Black tourmaline (schorl)
Schorl, a sodium–iron tourmaline; approximate formula NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄
mineral
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Pink tourmaline (likely rubellite), faceted gemstone
Elbaite tourmaline, Na(Li₁.₅Al₁.₅)Al₆Si₆O₁₈(BO₃)₃(OH)₄
gemstone
Amethyst (rough crystal)
Quartz, SiO₂; purple coloration from trace iron and natural irradiation
mineral
Amethyst crystal
Quartz (SiO₂), purple variety colored by trace iron and irradiation
mineral
Tumbled amethyst
Quartz (SiO₂), purple variety colored by trace iron and natural irradiation
mineral