Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
mineral
Category
Igneous Or Metamorphic
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Sapphire (Rough Corundum)
Corundum (Aluminum Oxide, Al2O3)
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Citrine
Silicon Dioxide (SiO2)
gemstone
Yellow Citrine Quartz
Silicon Dioxide (SiO₂)
mineral
Biotite (Black Mica)
K(Mg,Fe)3AlSi3O10(OH,F)2
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Smoky Quartz with Calcite/Quartz Veining
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst (Tumbled)
Silicon Dioxide (SiO2) with iron impurities
mineral
Smoky Quartz (with complementary stones in jewelry setting)
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Hematite
Hematite (Fe2O3)
Mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Citrine
Silicon dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
mineral
Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8)
mineral
Black Tourmaline
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)
mineral
Blue Quartz
Silicon Dioxide (SiO2) with inclusions
mineral
Citrine
Silicon Dioxide (SiO2) with ferric iron impurities
gemstone
Magnetite / Hematite mix
Magnetite (Fe3O4) and Hematite (Fe2O3)
mineral
Pyrite-bearing Rock
Iron Sulfide (FeS2) associated with host rock
mineral
Moonstone (with Tourmaline/Mica)
Orthoclase/Albite Feldspar (KAlSi3O8 / NaAlSi3O8)
mineral
Citrine Quartz carving
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Smoky Quartz (Faceted)
Silicon Dioxide (SiO2)
gemstone
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Blue Aura Quartz
Silicon Dioxide (SiO2) with metallic vapor coating
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Quartz Crystal Fragment
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Quartz (Smoky Quartz variant)
Silicon Dioxide (SiO2)
mineral
Moonstone with Black Tourmaline
Feldspar (KAlSi3O8) with inclusions of Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Quartz Sand Gravel
Silicon Dioxide (SiO2)
sedimentary
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Hypersthene
Enstatite (Hypersthene variety), (Mg,Fe)SiO3
mineral