Hematite
Ferric Oxide (Fe2O3)
mineral
Category
Mineral (Primary Constituent)
Browse mineral (primary constituent) specimens identified by the Rock Identifier community.
Tiffany Stone
Fluorite Opal (a complex mix of Fluorite, Opal, Calcite, Dolomite, Quartz, and Bertrandite)
mineral
Bauxite
Bauxite (Al2O3·nH2O)
sedimentary
Quartz (specifically Milky or Clear Quartz fragment)
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Matrix
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Clear Fragment)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Crystalline variety)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz / Vein Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcite (CaCO3)
Mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Uraninite (Pitchblende)
Uranium dioxide (UO2)
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Lepidolite and Rubellite (Pink Tourmaline) in Quartz
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lepidolite) and Na(Li,Al)3Al6(BO3)3Si6O18(OH)4 (Elbaite/Pink Tourmaline)
mineral
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Corundum
Corundum (Aluminium oxide, Al2O3)
mineral
Gold Nugget
Native Gold (Au)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Optical Calcite (Iceland Spar)
Calcium Carbonate (CaCO3)
mineral
Peacock Ore (Bornite or Chalcopyrite treated with acid)
Bornite (Cu5FeS4) or Acid-washed Chalcopyrite (CuFeS2)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Peacock Ore
Bornite (Cu5FeS4)
mineral
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Black Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Amber
Succinite (organic mineraloid); Chemical formula: C10H16O
mineral
Quartz (Smoky/Milky Variety)
Silicon Dioxide (SiO2)
mineral
Magnetite (Lodestone)
Iron(II,III) oxide (Fe3O4)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral