Anthropic Metallic Specimen

Sulfur-bearing iron ore, likely pyrite-rich gossan

Pyrite (FeS₂) with iron oxides/hydroxides and dark host rock

Hematite

Iron(III) oxide (Fe2O3)

Magnetite with Serpentine

Magnetite (Fe3O4) in Serpentine Matrix

Pyrite

Iron Sulfide (FeS2)

Blue metallic mineral specimen, possibly bornite or chalcopyrite

Bornite (Cu₅FeS₄) or chalcopyrite (CuFeS₂); exact identification requires testing

Gold in Quartz Matrix

Native Gold (Au) with Quartz (SiO2) and Slate/Shale

Sunstone (Feldspar variety)

Plagioclase Feldspar (Na,Ca)(Si,Al)3O8 with Hematite/Goethite inclusions

Dark metallic sulfide specimen, possibly galena

Galena (lead sulfide, PbS), identification tentative

Pyrite-bearing quartz vein fragment

Quartz (SiO₂) with pyrite (FeS₂), possibly minor chalcopyrite

Iron-rich meteorite candidate

Probable stony-iron or iron meteorite; exact classification requires testing

Gold

Native Gold (Au)

Biotite Schist (with Garnet and Pyrite)

K(Mg,Fe)3AlSi3O10(OH,F)2 (Biotite focus)

Pyrite (likely)

Pyrite, iron sulfide (FeS₂)

Likely raw gold-bearing rock or native gold specimen

Possibly native gold (Au); identification is uncertain from the image

Quartz with Chalcopyrite (or Pyrite)

Silicon Dioxide (SiO2) with Copper Iron Sulfide (CuFeS2)

Aura Quartz

Silicon Dioxide (SiO2) with metallic vapor coating

Galena

Galena (lead sulfide, PbS)

Galena

Galena (lead sulfide, PbS)

Pyrite-bearing rock (likely pyrite in a dark host rock)

Pyrite, FeS₂, with an unidentified host matrix

Pyrite (on host rock)

Iron Sulfide (FeS2)

Pyrite in Slate

Iron Sulfide (FeS2) in Slate host matrix

Pyrite (Fool's Gold)

Iron Pyrite (FeS2)

Quartz with Pyrite

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)

Likely raw metallic sulfide mineral, possibly galena or sphalerite

Uncertain; galena (PbS) or sphalerite (ZnS) are plausible

Possible iron meteorite

Unclassified iron–nickel meteorite; composition cannot be confirmed visually

Unidentified gray metallic object

Not determinable from the image; likely a metal screw or manufactured fastener rather than geological material

Iron meteorite (probable)

Fe–Ni alloy, mainly kamacite and taenite

Pyrite

Iron Sulfide (FeS2)

Silicon Carbide (Carborundum)

Silicon Carbide (SiC)

Gold Ore in Quartz

Auriferous Quartz (Gold: Au; Quartz: SiO2)

Peacock Ore (Bournite/Chalcopyrite)

Bornite (Cu5FeS4) or Acid-Treated Chalcopyrite (CuFeS2)

Tumbled hematite

Hematite (Fe₂O₃), possibly specular or massive hematite

Likely weathered native copper-bearing rock

Unidentified copper-bearing specimen; native copper (Cu) is possible but cannot be confirmed visually

Possible iron meteorite

Iron meteorite, likely kamacite–taenite alloy

Metallic sulfide ore, likely galena-bearing rock

Galena (lead sulfide, PbS), possibly with pyrite or other sulfides

Pyrite

Iron Sulfide (FeS2)

Iron-rich rock, possibly hematite-rich ore

Likely hematite (Fe₂O₃) with possible goethite or host-rock minerals; identification is uncertain from the image alone

Copper-bearing Basalt with Epidote and Quartz

Native copper in basalt amygdaloidal matrix

Sandstone with Manganese Dendrites/Oxide coatings

Arenite with Pyrolusite and Romanechite (MnO2)

Pyrite

Iron Sulfide (FeS2)

Labradorite

Labradorite ((Ca, Na)(Al, Si)4O8)

Aura Quartz (Pink/Rose Aura Quartz)

Silicon Dioxide (SiO2) bonded with Platinum and/or Silver