Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Category
Mineral (Specifically A Gemstone Variety)
Browse mineral (specifically a gemstone variety) specimens identified by the Rock Identifier community.
Rough Ruby
Corundum (Al2O3) with Chromium traces
mineral
Green Tourmaline
Verdelite (Silicate mineral); Na(Li,Al)3Al6(BO3)3Si6O18(OH)4
mineral
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (SiO2 + Fe2O3)
sedimentary
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Carnelian (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Amber
Succinite (fossilized resin)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
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
Kyanite
Kyanite (Al2SiO5)
mineral
Amazonite
Amazonite (KAlSi3O8)
mineral
Sugilite
Sugilite (KNa2(Fe,Mn,Al)2Li3Si12O30)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Lake Superior Agate
Banded Chalcedony (Silicon Dioxide / SiO2)
mineral
Amazonite
Potassium Feldspar (Microcline) - K(AlSi3O8)
mineral
Diamond
C (Carbon)
mineral
Orange Calcite (Mexican Onyx)
Calcium Carbonate (CaCO3)
mineral
Amazonite
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Yellow Quartz (Chalcedony/Citrine Pebble)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Sodalite
Sodalite, Na8(Al6Si6O24)Cl2
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Amethyst
SiO2 (Silicon Dioxide with Iron impurities)
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Pegmatite
Coarse-grained Igneous Rock (Granitic Pegmatite)
igneous
Emerald
Beryl (Be3Al2(SiO3)6) with trace Chromium/Vanadium
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Schorl (Black Tourmaline)
Schorl (Sodium Iron Aluminum Borosilicate Hydroxide), NaFe3Al6(BO3)3Si6O18(OH)4
mineral
Satin Spar (often marketed as Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Sandstone
Arenite (SiO2 principal)
sedimentary
Chrysocolla
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)
mineral