Anthropic Metallic Specimen

Gold Ore in Matrix

Native Gold (Au) in Quartz/Host Rock

Quartz–calcite sulfide-bearing mineral specimen

Quartz (SiO₂) with likely calcite (CaCO₃) and iron sulfides, possibly pyrite (FeS₂); exact species requires testing

Pyrite specimen

Pyrite, FeS₂ (iron disulfide)

Native gold-bearing quartz/ore fragment

Native gold (Au) with quartz (SiO₂), possibly sulfide-associated

Native metal specimen, likely galena or metallic slag

Probably galena (lead sulfide, PbS); identification is uncertain from the image alone

Likely native copper nugget

Native copper (Cu)

Rounded iron-rich pebble

Likely hematite/goethite-bearing quartzite or ironstone; exact identification requires testing

Likely galena-bearing rock

Galena (PbS), possibly in a dark host rock

Pyrite in Quartz

Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)

Polished Unakite pebble

Unakite: pink potassium feldspar and green epidote in quartz-rich rock

Nugget of Native Silver

Native Silver (Ag)

Slag (Industrial Glassy Byproduct)

Ferro-silicate Slag

Pyrite in Limestone

Iron Sulfide (FeS2) in Calcium Carbonate (CaCO3)

Raw galena specimen

Galena (lead sulfide, PbS)

Iron meteorite fragment (likely meteorite slice)

Fe–Ni metallic meteorite, possibly an octahedrite; exact classification requires laboratory analysis

Unknown dark mineral/rock fragment

Indeterminate; possibly a dark sulfide mineral or slag-like geological fragment

Basalt

Mafic volcanic rock (Basalt)

Iron meteorite candidate

Fe–Ni metallic meteorite, possibly an ordinary octahedrite

Copper-bearing basalt or volcaniclastic rock

Cuprite–malachite-bearing mafic volcanic rock; likely basalt with copper sulfides/oxides

Pyrite Geode

Iron Disulfide (FeS2)

Pyrite in Matrix (likely Quartz or Schist matrix)

Iron Sulfide (FeS2)

Basalt

Basalt (Mafic volcanic rock)

Sunstone

Oligoclase (Plagioclase Feldspar), (Na,Ca)(Si,Al)4O8

Iron meteorite (probable)

Fe–Ni metallic meteorite, commonly octahedrite (kamacite–taenite)

Weathered gray mineral-rich rock, possibly galena-bearing ore

Tentatively galena-bearing sulfide vein rock; galena is PbS, but identification is uncertain from the photograph

Chalcopyrite on Quartz

CuFeS2 (Chalcopyrite) with SiO2 (Quartz)

Limonite Geode / Ironstone Concretion

Hydrated iron oxide-hydroxide (FeO(OH)·n H2O)

Likely iron-rich metamorphic rock (possibly hematite-rich ironstone)

Unidentified ferruginous rock; exact mineralogy cannot be determined from the image

Pyrite-rich sulfide ore (likely pyrite with chalcopyrite)

Pyrite, FeS₂; possible chalcopyrite, CuFeS₂, and minor quartz or sphalerite

Green Aventurine

Silicon Dioxide (Quartz) with inclusions of Fuchsite (K(Al,Cr)2AlSi3O10(OH)2)

Tumbled hematite-rich jasper

Jasper (microcrystalline quartz, SiO₂) with iron oxides, chiefly hematite (Fe₂O₃)

Quartz with Mica (Muscovite or Biotite)

Silicon Dioxide (SiO2) with Phyllosilicates

Pyrite (on Shale/Matrix)

Iron Disulfide (FeS2)

Gold-bearing quartz vein fragment (probable placer gold specimen)

Quartz (SiO₂) with probable native gold (Au) and iron-oxide staining

Pyrite-bearing quartz specimen

Pyrite (FeS₂) with quartz (SiO₂), possibly minor chalcopyrite or iron oxides

Unidentified gray rock/mineral specimen

Indeterminate; possibly quartz-rich rock or a metallic sulfide-bearing specimen

Iron Meteorite (likely an Individual specimen)

Iron Meteorite (Group IAB, IIAB, IIIAB, etc., Fe-Ni alloy)

Likely polished dark metallic mineral specimen

Indeterminate from image; possibly hematite, magnetite, or galena

Quartz with inclusions

SiO2

Copper Nugget

Native Copper (Cu)

Schist

Mica Schist

Synthetic Zinc/Polycarbonate Composite (Bey-specimen)

Zinc Alloy (Zamak 3) with Polycarbonate (C15H16O2)n Overlay