Black Diamond / Black Sapphire
Carbon (C) or Corundum (Al2O3)
mineral
Category
Mineral (Primary Constituent)
Browse mineral (primary constituent) specimens identified by the Rock Identifier community.
Amethyst
Silicon Dioxide (SiO2) with trivalent iron (Fe3+) impurities
mineral
Blue Sapphire
Corundum (Al2O3 with trace Titanium and Iron)
mineral
Specular Hematite (Iron Ore)
Iron(III) oxide (Fe2O3)
mineral
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Arsenopyrite in Quartz Matrix
Arsenopyrite (FeAsS)
mineral
Gold Flake
Native Gold (Au)
mineral
Hematite
Iron(III) oxide (Fe2O3)
Mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Sphalerite
Zinc Sulfide (Zn,Fe)S
mineral
Granite
Felsic intrusive igneous rock
igneous
Blue Aventurine
Silicon Dioxide (SiO2) containing Dumortierite or Crocidolite inclusions
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Magnetite or Hematite-rich Ore
Magnetite (Fe3O4) or Hematite (Fe2O3)
mineral
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Chalcopyrite
Chalcopyrite (CuFeS2)
mineral
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lithium-bearing Phyllosilicate)
mineral
White Quartz
Quartz (SiO2)
Mineral
Serpentinite
Serpentinite (complex silicate minerals including lizardite, chrysotile, and antigorite)
metamorphic
Soapstone (Steatite)
Steatite (primarily Talc: Mg3Si4O10(OH)2)
metamorphic
Amethyst
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Specular Hematite and Magnetite Ore
Iron Oxide (Fe2O3 and Fe3O4)
mineral
Celestite (Celestine)
Strontium Sulfate (SrSO4)
mineral
Celestite (Celestine)
Strontium Sulfate (SrSO4)
mineral
Ferruginous Sandstone (Ironstone)
Iron-rich Arenite
sedimentary
Scoria (Lava Rock)
Mafic extrusive volcanic rock (Scientific formula varies based on mineral content: primarily SiO2, MgO, and FeO)
igneous
Basalt with Vesicles
Vesicular Basalt (comprising Plagioclase Feldspar, Pyroxene, and Olivine)
igneous
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Ocean Jasper
Spherulitic Chalcedony (SiO2)
mineral
Kimberlite
Kimberlite (Group I or II)
igneous
Sandstone (lithic wacke/arenite)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Granite Glacial Erratic
Intrusive Phaneritic Felsic Rock (Granite)
igneous
Asphalt (Road Aggregate)
Bituminous Conglomerate / Asphalt Concrete
Anthropogenic (Man-made)
Granitic Pegmatite
Granite Pegmatite (typically containing Quartz SiO2, Feldspar KAlSi3O8, and Muscovite)
Igneous
Lazulite
Lazulite (Mg,Fe2+)Al2(PO4)2(OH)2
mineral