Pyrite
Iron Sulfide (FeS2)
mineral
Category
Mineral (Metal)
Browse mineral (metal) specimens identified by the Rock Identifier community.
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Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Opalite
Synthetic Silicon Dioxide (SiO2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Copper Nugget
Native Copper (Cu)
mineral
Green Aura Quartz
Silicon Dioxide (SiO2) bonded with metallic vapors (typically Gold, Chromium, or Titanium)
mineral
Opalite
Man-made opalized glass
mineral
Gold-bearing Quartz
Auriferous Quartz (SiO2 with Native Gold inclusion)
mineral
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Slag (Industrial Glass Slag)
Amorphous Silica / Ferro-silicate Slag
mineraloid / anthropogenic
Serpentinite
Serpentinite (composed largely of serpentine group minerals including Antigorite, Lizardite, and Chrysotile, (Mg,Fe)3Si2O5(OH)4)
metamorphic
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Weathered dark igneous rock, likely basalt
Basalt, predominantly plagioclase feldspar and pyroxene, with possible olivine and iron oxides
igneous
Quartzite Cobble
Metamorphosed Quartz Sandstone (primarily SiO2)
metamorphic
Foliated schist, likely mica schist
Mica schist; chiefly quartz (SiO₂), muscovite/biotite mica, and feldspar
metamorphic
Chert (Flint)
Chert (SiO2)
sedimentary
Quartzite (River Cobble)
Recrystallized Quartz (SiO2)
metamorphic
Iron-oxide-stained sulfide-bearing rock, possibly pyrite-bearing schist
Likely quartz–mica schist or massive sulfide rock with pyrite (FeS₂) and limonite/goethite (FeO(OH)·nH₂O)
metamorphic
Metallic meteorite fragment (probable stony-iron or iron meteorite)
Undetermined meteoritic Fe–Ni alloy with silicate minerals
meteorite
Copper ore-bearing rock (likely malachite/chrysocolla in a sulfide-rich matrix)
Cuprite–malachite/chrysocolla mineralization; probable copper sulfides such as chalcopyrite in altered host rock
mineral
Metallic sulfide mineral fragment, likely galena
Galena (lead sulfide, PbS), tentative identification
mineral
Decorative gemstone-chip jewelry (likely turquoise, coral, and assorted beads)
Predominantly turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; other pieces appear to be dyed coral or red stone, and possibly shell/metal components
gemstone
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Pyrite
Iron disulfide (FeS2)
mineral
Epidosite
Epidosite (Metasomatic rock consisting mainly of Epidote and Quartz)
metamorphic
Vesicular basalt (likely weathered volcanic rock)
Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine
igneous
Native copper-bearing rock
Native copper (Cu), likely with copper oxides/carbonates in a host rock
mineral
Gold-bearing quartz or iron-stained sulfide specimen
Native gold (Au), possibly in quartz with limonite/goethite and sulfide remnants
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Aquamarine (Small Beads)
Beryl (Be3Al2Si6O18 with traces of iron)
gemstone
Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Zircon
Zirconium Silicate (ZrSiO₄)
mineral
Transit Token (RTD Denver)
Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)
not a rock or mineral (anthropogenic material)
Soapstone (Steatite)
Steatite (Hydrous magnesium silicate)
metamorphic
Bismuth Crystal
Bismuth (Bi)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Gold Ore in Quartz
Native Gold (Au) in Quartz (SiO2)
mineral
Opalite
Synthetic Glass (Silica-based)
gemstone