Amethyst
Amethyst (SiO2 with iron impurities)
mineral
Category
Granite
Browse granite specimens identified by the Rock Identifier community.
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Gold-bearing Quartz
Native Gold (Au) in Quartz (SiO2) matrix
mineral
Diamond (Round Brilliant Cut)
Diamond (Pure Carbon, C)
mineral
Bronzite
MgSiO3 (Enstatite with 10-30% FeSiO3 in solid solution)
Mineral
Diamond
Diamond (C)
Mineral
Turquoise and Hematite
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)
mineral
Red Jasper (River Pebble)
Silicon Dioxide (SiO2) with hematite impurities
sedimentary (microcrystalline quartz)
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Basalt with Quartz Veins
Mafic Igneous Rock with Quartz (SiO2) intrusions
igneous
Citrine
Silicon Dioxide (SiO₂)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2 with Iron impurities)
mineral
Rough Diamond
Diamond (Native Carbon, C)
mineral
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Anthracite Coal
Anthracite
metamorphic
Sodalite
Na8(Al6Si6O24)Cl2 (Sodium Aluminum Silicate Chloride)
mineral
Ironstone (Limonitic Shale)
Ferruginous Siltstone / Goethite-rich Sedimentary Rock
sedimentary
Pebble
Clast (specifically a granule or small pebble)
Sedimentary
Khondalite
Garnet-sillimanite-graphite schist/gneiss
metamorphic
Amethyst
Amethyst (SiO2 with iron impurities)
mineral
Citrine (likely Heat-Treated Amethyst)
Silicon Dioxide (SiO2)
mineral
Garnet (Almandine)
Almandine Garnet (Fe3Al2(SiO4)3)
Mineral
Barite (Desert Rose or Cockscomb variety)
Barium Sulfate (BaSO4)
mineral
Agate Geode
Cryptocrystalline Quartz (SiO2) with Chalcedony banding
mineral
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Gold Nugget
Native Gold (Au)
mineral
Tanzanite (Rough)
Blue Zoisite (Ca2Al3(SiO4)3(OH))
mineral
Gold Ore in Quartz
Auriferous Quartz (Gold: Au; Quartz: SiO2)
Mineral
Citrine
Silicon Dioxide (SiO2) with iron impurities
Mineral
Amethyst
Silicon Dioxide with Iron impurities (SiO2)
mineral
Pyrite in Host Rock
Iron Disulfide (FeS2)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
gemstone
Galena
Lead(II) sulfide (PbS)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (mica)
Mineral (variety of Quartz)
Basalt
Vesicular Basalt
igneous
Eclogite
Eclogite
metamorphic
Garnet (specifically Almandine or Pyrope)
Almandine: Fe3Al2(SiO4)3 or Pyrope: Mg3Al2(SiO4)3
mineral
Diamond (in a jewelry setting)
Carbon (C)
mineral
Garnet (Almandine/Pyrope series)
Silicate mineral (Almandine: Fe3Al2Si3O12; Pyrope: Mg3Al2Si3O12)
mineral
Garnet
Garnet Group (Silicate Minerals), formula varies e.g., Almandine Fe3Al2(SiO4)3
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral