Anthropic Metallic Specimen

Native copper nugget

Copper (Cu), commonly with cuprite and copper-oxide alteration

Small metallic-looking mineral/rock fragment

Indeterminate from image; possibly galena, hematite, or metallic slag

Metallic sulfide mineral specimen, likely pyrite

Pyrite (iron disulfide, FeS₂), possibly mixed with marcasite or chalcopyrite

Likely metallic mineral specimen

Probably galena (lead sulfide, PbS), though visual identification is uncertain

Metallic iron meteorite fragment (probable)

Iron meteorite, mainly kamacite (α-Fe–Ni), possibly with taenite

Mica Schist

Mica Schist (primarily Muscovite and Quartz)

Tiger Iron

Tiger Iron (Composition: SiO2, Fe2O3, Fe3O4)

Sunstone

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

Raw metallic sulfide specimen, likely galena

Galena (lead sulfide, PbS), possibly mixed with sphalerite or chalcopyrite

Schist

Mica Schist (Metamorphic Rock)

Galena with Pyrite on Matrix

Lead(II) sulfide (PbS) with Iron disulfide (FeS2)

Pyrite in Matrix

Iron Sulfide (FeS2)

Copper Nugget

Native Copper (Cu)

Copper-bearing sulfide ore, likely chalcopyrite with iron oxides

Chalcopyrite (CuFeS₂), possibly associated with bornite (Cu₅FeS₄), pyrite, and limonite/goethite

Iron meteorite candidate

Likely an iron-rich meteorite, possibly a weathered octahedrite (Fe–Ni alloy); identification is uncertain from the image alone

Galena (likely)

Galena, lead sulfide (PbS)

Galena-bearing quartz rock

Galena (PbS) in quartz gangue, likely with minor sulfides and iron oxides

Dark polished stone, likely basalt or slag-like volcanic rock

Probable fine-grained basalt; exact identification requires testing

Specular Hematite with Quartz and Limonite

Hematite (Fe2O3) with Quartz (SiO2) and Limonite (FeO(OH)·nH2O)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Possible hematite-bearing pebble

Hematite, Fe₂O₃, possibly mixed with magnetite or iron-rich matrix

Purple fluorite

Fluorite (calcium fluoride, CaF₂)

Magnetite or Ironstone Nodule

Magnetite (Fe3O4) or Hematite-rich Sedimentary Nodule

Basalt

Basalt

Tiger Diamond / Hematite-infused Quartzite

Silicified Hematite-Rich Quartzite (SiO2 + Fe2O3)

Possible iron-rich meteorite or metallic sulfide-bearing rock

Unconfirmed; candidates include stony-iron meteorite, iron meteorite, or pyrite-bearing terrestrial rock

Pyrite-bearing rock (likely pyrite in a quartz or sulfide-rich matrix)

Pyrite, FeS₂; the gray host may be quartz, carbonate, or another sulfide-bearing rock

One Pound Coin (UK)

Nickel-Brass Alloy (Cu-Zn-Ni)

Dark, vesicular volcanic rock (likely basaltic scoria)

Scoria; fine-grained basaltic rock composed chiefly of plagioclase, pyroxene, and possibly olivine

Pyrite

Iron Sulfide (FeS2)

Gold-bearing quartz or iron-stained sulfide specimen

Native gold (Au), possibly in quartz with limonite/goethite and sulfide remnants

Possible ironstone concretion

Iron-oxide-rich concretion, likely hematite/goethite; exact identification is uncertain from the photo

Weathered copper-bearing sulfide rock (likely bornite/chalcopyrite)

Bornite (Cu5FeS4) and/or chalcopyrite (CuFeS2), with oxidation tarnish

Gold Nugget

Native Gold (Au)

Polished hematite pebble

Hematite, Fe₂O₃

Polished metallic ore/mineral specimen, possibly pyrite-bearing schist

Indeterminate from image; likely pyrite (FeS₂) with quartz and/or mica in a metamorphic matrix

Jasper with Pyrite (Gold-colored inclusions)

Silicon Dioxide (SiO2) with Iron Disulfide (FeS2) inclusions

Small metallic mineral fragment

Unidentified metallic sulfide or native-metal fragment

Arsenopyrite in Quartz Matrix

Arsenopyrite (FeAsS) with Quartz (SiO2)

Pyrite-bearing dark igneous rock, possibly basalt

Likely basalt or mafic volcanic rock with disseminated pyrite (FeS₂); identification is provisional from the photograph

Pyrite in Matrix

Iron Disulfide (FeS2)

Metallic sulfide ore fragment, possibly pyrite-bearing rock

Indeterminate; likely pyrite (FeS₂) in a sulfide-rich matrix