Amethyst
Silicon Dioxide (SiO2) containing iron impurities
mineral
Category
Mineral, Organic Gemstone
Browse mineral, organic gemstone specimens identified by the Rock Identifier community.
Amber
Succinite (fossilized resin)
mineral
Onyx (Black Onyx)
Onyx (Silicon Dioxide, SiO2)
mineral
Pink Garnet (likely Almandine or Rhodolite)
Garnet Group (Fe3Al2(SiO4)3 to Mg3Al2(SiO4)3)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Kyanite
Kyanite (Al2SiO5)
mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Diamond
C (Carbon)
mineral
Amethyst
Silicon Dioxide with trace Iron (SiO2)
mineral
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Amazonite
Potassium Feldspar (Microcline) - K(AlSi3O8)
mineral
Amazonite
Amazonite (KAlSi3O8)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Lake Superior Agate
Banded Chalcedony (Silicon Dioxide / SiO2)
mineral
Yellow Quartz (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sugilite
Sugilite (KNa2(Fe,Mn,Al)2Li3Si12O30)
mineral
Orange Calcite (Mexican Onyx)
Calcium Carbonate (CaCO3)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
mineral
Amazonite
K(AlSi3O8) - Microcline (Var. Amazonite)
mineral
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Carnelian Agate
Carnelian (Silicon Dioxide - SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Peridot (Olivine)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Yellow Quartz (Chalcedony/Citrine Pebble)
Silicon Dioxide (SiO2)
mineral
Amazonite
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Smoky Quartz
SiO2 (Silicon Dioxide)
mineral
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Quartz (Smoky/Grey variety)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Sunstone (Feldspar variety)
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Peridot
Olivine (Mg, Fe)2SiO4
mineral
Sodalite
Sodalite, Na8(Al6Si6O24)Cl2
mineral
Fossil Shark Tooth (Otodus obliquus)
Otodus obliquus; hydroxyapatite (mineralized form Ca5(PO4)3(OH))
sedimentary (fossiliferous)