Gold Nugget
Native Gold (Au)
mineral
Category
Anthropic Metallic Specimen
Browse anthropic metallic specimen specimens identified by the Rock Identifier community.
Sunstone
Plagioclase Feldspar (Na,Ca)(Si,Al)4O8
mineral
Peacock Ore (Chalcopyrite)
Chalcopyrite (CuFeS2)
mineral
Muscovite Mica (in Quartz/Feldspar Matrix)
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Muscovite Mica Schist
Metamorphic Rock (Muscovite-Biotite Schist)
metamorphic
Basalt (Crushed Roadstone)
Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Fluorite
Calcium Fluoride (CaF2)
mineral
Man-made Dyed Aura Quartz
Silicon Dioxide (SiO2) with metallic coating/dye
mineral
Gold Nugget
Native Gold (Au)
mineral
Weathered metallic meteorite (probable iron meteorite)
Fe–Ni alloy, mainly kamacite and taenite; exact classification requires chemical and petrographic testing
meteorite
Pyrite
Iron Disulfide (FeS2)
mineral
Asphalt (Bituminous Concrete)
Bituminous Concrete / Pavement
man-made (synthetic rock)
Porphyritic Basalt
Basalt with Feldspar phenocrysts
igneous
Banded iron formation (likely iron-rich metamorphic rock)
Banded iron formation; hematite–magnetite with chert/jasper (Fe₂O₃/Fe₃O₄ and SiO₂)
metamorphic
Pyrite-bearing metamorphic rock (probable pyrite schist or sulfide ore)
Pyrite (FeS₂) in a foliated, quartz–mica-rich host rock; exact identification requires testing
metamorphic
Basalt (Vesicular)
Extrusive mafic igneous rock; primarily (Ca, Na)(Mg, Fe, Al)(Si, Al)2O6 with (Ca, Na)(Al, Si)4O8
igneous
Sphalerite with Agate and Druzy Quartz
Zinc Sulfide (ZnS) with Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Bornite
Bornite (Cu5FeS4)
mineral
Gold Nugget
Native Gold (Au)
Mineral
Pyrite-rich rock (iron pyrite specimen)
Pyrite, FeS₂, likely in a sulfide-rich matrix
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Limonite
FeO(OH)·n(H2O)
mineral
Basalt (Vesicular or Weathered)
Aphanitic Mafic Igneous Rock (Basalt)
igneous
Granitic Pegmatite with Tourmaline and Sphalerite
Pegmatite containing Schorl (NaFe3Al6(BO3)3Si6O18(OH)4) and Sphalerite ((Zn,Fe)S)
igneous
Limonite Geode (Ironstone Concretion)
FeO(OH)·nH2O (Hydrated Iron Oxide)
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Green Aventurine
Quartzite (variety Aventurine) with Fuchsite inclusions (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Basalt (with Brass Inlay)
Basalt (Mafic volcanic rock)
igneous
Pyrite
Iron Sulfide (FeS2)
mineral
Black Sapphire (Basaltic Blue Sapphire)
Corundum (Al2O3)
mineral
Moqui Marble
Hematite-Goethite Concretion
sedimentary
Banded iron formation (ironstone)
BIF; chiefly hematite/magnetite with chert or jasper (Fe₂O₃/Fe₃O₄ and SiO₂)
sedimentary
Small polished dark mineral specimen
Indeterminate; possibly black tourmaline (schorl) or hematite
mineral
Metallic sulfide-bearing rock, likely galena-rich ore
Galena (lead sulfide, PbS), possibly mixed with pyrite and host rock
mineral
Pyrite (likely)
Iron disulfide, FeS₂; commonly called fool’s gold
mineral
Quartz-rich metallic sulfide ore (probable pyrite-bearing rock)
Pyrite, FeS₂, in a quartz-rich host; exact identification is uncertain from the image
mineral
Basalt (River Stone)
Basalt (Mafic volcanic rock)
igneous
Basalt (River Stone)
Extrusive mafic igneous rock
igneous