Amethyst
Silicon Dioxide (SiO2) containing iron impurities and irradiation
mineral
Category
Igneous, Metamorphic, Sedimentary
Browse igneous, metamorphic, sedimentary specimens identified by the Rock Identifier community.
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Multi-Gemstone Quartz Bracelet (Amethyst, Aventurine, Rose Quartz, Clear Quartz)
Silicon Dioxide (SiO2) mixture
gemstone
Faceted Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
gemstone
Orthoclase Feldspar
K(AlSi3O8)
mineral
Rough Sodalite
Sodalite, Na8(Al6Si6O24)Cl2
mineral
Amethyst (Tumbled)
Silicon Dioxide (SiO2) with iron impurities
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Sapphire
Corundum (Al2O3)
mineral
Magnetite with Serpentine
Magnetite (Fe3O4) in Serpentine Matrix
mineral
Blue Quartz
Quartz (Silicon Dioxide) with blue inclusions (SiO2)
mineral
Biotite Mica in Quartz
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2) in Quartz (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Smoky Quartz
Silicon Dioxide (SiO₂)
mineral
Orthoclase Feldspar with Quartz
Orthoclase (KAlSi3O8)
mineral
Garnet
Garnet group species (likely Almandine, Fe3Al2(SiO4)3)
mineral
Rough Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Yellow Aventurine (specifically a carved crescent moon)
Silicon Dioxide (SiO2) with inclusions
mineral
Orthoclase Feldspar (Sunstone variety)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Smoky Quartz (with inclusions)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz (with complementary stones in jewelry setting)
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Feldspar (Orthoclase)
Potassium Feldspar (KAlSi3O8)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Citrine
Silicon dioxide (SiO2)
mineral
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
mineral
Banded Agate
Silicon Dioxide (SiO2)
mineral
Yellow Citrine Quartz
Silicon Dioxide (SiO₂)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Milky Quartz on Matrix
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
mineral
Citrine
Silicon dioxide (SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Moonstone
Orthoclase Feldspar (KAlSi3O8)
mineral
Garnet (Pyrope or Almandine)
Silicate (X3Y2Si3O12)
mineral
Biotite (Black Mica)
Biotite (K(Mg,Fe++)3AlSi3O10(OH,F)2)
mineral
Citrine or Yellow Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Star Ruby
Corundum (Al2O3 with chromium and rutile inclusions)
mineral
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral