Ruby (faceted gemstone)
Corundum (Al2O3 with Cr impurities)
gemstone
Category
Mineral (Native Element Alloy)
Browse mineral (native element alloy) specimens identified by the Rock Identifier community.
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Likely galena-bearing ore
Galena (PbS), possibly mixed with quartz or carbonate gangue
mineral
Obsidian
Obsidian (principally SiO2/Silicon dioxide)
igneous
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Rose Quartz
Silicon dioxide (SiO2)
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
gemstone
Petoskey Stone
Hexagonaria percarinata
fossil
Red Jasper
Silicon dioxide (microcrystalline quartz, $SiO_2$)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron Oxide inclusions
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Thunderegg (Agate Geode)
Agate/Chalcedony filled Rhyolite nodule (SiO2)
igneous
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Red Jasper
Silica (Silicon Dioxide), Formula: SiO2 with Iron impurities
sedimentary
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Red Jasper
Jasper (Silicon Dioxide) - SiO2
sedimentary
Granitic Pebble (Glacial Erratic)
Granite
igneous
Mica-bearing quartz rock (likely pegmatite)
Quartz–feldspar–mica pegmatite; dark mica is probably biotite, possibly muscovite or chlorite
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt
igneous
Metallic sulfide ore, likely galena-bearing rock
Galena (lead sulfide, PbS), possibly with pyrite or other sulfides
mineral
Raw galena specimen
Galena (lead sulfide, PbS)
mineral
Polished pink-and-white quartzite (likely rose-quartz-bearing quartzite)
Quartzite, predominantly SiO₂ (quartz), with iron-oxide staining and possible feldspar/mica impurities
metamorphic
Iron meteorite (likely)
Fe–Ni metallic meteorite, commonly kamacite–taenite
meteorite
White Buffalo Turquoise (or White Buffalo Stone/Howlite/Magnesite)
Calcite/Dolomite with Chert/Flint (Often mislabeled as Turquoise, true White Buffalo is a mix of chalcedony and calcite/dolomite)
gemstone
Gold Ore (in Quartz/Sulfide matrix)
Native Gold (Au) in Quartz (SiO2) and Pyrite (FeS2)
mineral
US Penny
Cuprum (Copper: Cu) and Zincum (Zinc: Zn) Alloy
Man-made object (metal alloy)
Malachite
Malachite (Cu2(CO3)(OH)2 - a copper carbonate hydroxide mineral)
Mineral
Native Gold (in Jewelry form)
Gold (Au)
Mineral
Native Gold (in the form of jewelry)
Gold (Au)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Red Jasper
Jasper (SiO2 with Fe2O3 inclusions)
sedimentary
Obsidian
Volcanic Glass (mostly SiO2)
igneous
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
sedimentary
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions), SiO2 + Fe2O3
sedimentary
Iron Meteorite
Iron-Nickel Meteorite (primarily composed of kamacite and taenite alloys)
Mineral
Diamond
Diamond (C)
Mineral
Quartz with Mica Schist Matrix
Quartz (SiO2) in Mica Schist Matrix
metamorphic
Amygdaloidal Basalt with Secondary Minerals
Basalt containing secondary mineralization (likely Chlorite, Celadonite, or Zeolites)
igneous
Iron Meteorite
Iron-nickel alloy (e.g., Kamacite, Taenite)
Meteorite (extraterrestrial material)
Metallic iron meteorite (probable)
Iron meteorite, typically kamacite–taenite (Fe–Ni alloy)
meteorite
Galena-bearing ore (tentative)
Galena, lead sulfide (PbS), likely in a quartz/carbonate-rich matrix
mineral