Aquamarine
Beryl (Be3Al2(SiO3)6)
gemstone
Category
Mineral, Jewelry
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Tanzanite
Zoisite (Ca2Al3(SiO4)(Si2O7)O(OH))
gemstone
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Peridot
Olivine ((Mg,Fe)2SiO4)
gemstone
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Amethyst
Silicon Dioxide (SiO2)
mineral
Blue Quartz
Silicon Dioxide (SiO2)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon dioxide (SiO2)
mineral
Citrine
Silicon Dioxide (Quartz variety), SiO2
mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Lake Superior Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Black Tourmaline
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)
mineral
Hematite Rose
Iron Oxide, Fe2O3
mineral
Amethyst
Silicon Dioxide (SiO2)
mineral
Citrine
Silicon dioxide with iron impurities (SiO2)
mineral
Plume Agate
Silicon Dioxide (SiO2)
gemstone
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Sunstone
Feldspar group (Oligoclase or Labradorite), Na(AlSi3O8) to Ca(Al2Si2O8)
mineral
Amethyst
Quartz (SiO2)
mineral
Polished pink stone, possibly rose quartz
Quartz (SiO₂), variety rose quartz; identification is uncertain from the image
mineral
Polished smoky quartz pebble (probable)
Quartz, SiO₂; smoky coloration is caused by trace aluminum and natural irradiation
mineral
Likely tumbled jasper or agate
Microcrystalline quartz (SiO₂), possibly jasper or chalcedony
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon dioxide (Microcrystalline quartz, SiO2)
sedimentary
Aquamarine in Matrix
Beryl (Be3Al2Si6O18)
gemstone
Green Quartz
Silicon Dioxide (SiO2)
mineral
Watermelon Tourmaline
Elbaite (Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)4)
mineral
Aquamarine
Beryl (Be3Al2(SiO3)6)
gemstone
Dendritic Opal
Hydrated amorphous silica with manganese oxide inclusions (SiO2·nH2O)
mineral
Spessartine Garnet
Mn3Al2(SiO4)3
mineral
Ethiopian Opal
Hydrated amorphous silica (SiO2·nH2O)
gemstone
Amethyst
Quartz (SiO2)
gemstone
Amethyst Cluster
Quartz (Silicon Dioxide, SiO2)
mineral
Amethyst
Quartz (SiO2)
gemstone
Chrysocolla in Quartz
(Cu,Al)2H2Si2O5(NOH)4 · nH2O + SiO2
mineral
Quartz Cluster
Silicon Dioxide (SiO2)
mineral
Opal
Hydrated amorphous silica (SiO2·nH2O)
mineral
Pink tourmaline crystal (likely polished or rough-cut)
Elbaite, Na(Li₁.₅Al₁.₅)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃
gemstone
Amethyst
Quartz, silicon dioxide (SiO₂), colored purple by trace iron and irradiation
gemstone
Likely labradorite-bearing rock
Labradorite (plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈)
igneous