Anthropic Metallic Specimen

Iron Ore (Hematite/Goethite)

Ironstone (Fe2O3 / FeO(OH))

River Cobble (likely Basalt or Chert)

Basalt (Mafic volcanic rock)

Schist

Mica Schist

Pyrite (fool’s gold)

Iron disulfide, FeS₂; cubic pyrite-group sulfide

Quartz-bearing altered rock, possibly iron-stained quartz vein

Quartz (SiO₂) in a feldspathic/sericitized host, with iron-oxide staining

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Native copper

Copper (Cu), often with malachite, cuprite, or matrix minerals

Bornite (“peacock ore”), likely polished specimen

Bornite, Cu5FeS4

Pyrite (likely), “fool’s gold”

Pyrite, FeS₂ (iron disulfide)

Graphite-rich metamorphic rock (likely graphite schist)

Graphite schist; predominantly graphitic carbon (C) with mica and quartz

Tumbled banded iron formation (jasper-rich ironstone)

Banded iron formation, commonly hematite/magnetite with microcrystalline quartz (SiO₂)

Gold Ore

Native Gold (Au)

Iron-rich banded iron formation fragment (likely hematite/magnetite ore)

Banded iron formation; chiefly hematite (Fe₂O₃), magnetite (Fe₃O₄), and silica (SiO₂)

Basalt

Basalt (Mafic Extrusive)

Mafic igneous rock, likely basalt or gabbro

Basalt–gabbro composition: chiefly plagioclase feldspar and pyroxene, with possible olivine and iron-titanium oxides

Blue-green peacock chalcopyrite

Chalcopyrite, CuFeS₂, artificially oxidized/iridescent-coated

Fuchsite (Green Muscovite / Mica Schist)

Chromian Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Pyrite in Quartz

Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)

Pyrite in Matrix (Gold-colored Chalcopyrite or Pyrite)

Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)

Pyrite

Iron Disulfide (FeS2)

Pyrite in Shale

Iron Sulfide (FeS2) in Sedimentary Matrix

Fluorite

Calcium Fluoride (CaF2)

Pyrite (iron pyrite)

Pyrite, FeS₂; cubic/isometric iron sulfide

Hematite

Ferric oxide (Fe2O3)

Lapis Lazuli with Pyrite

Lapis lazuli (Mainly Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Basalt

Mafic extrusive igneous rock

Metallic sulfide-bearing rock, possibly galena-rich ore

Likely galena (PbS) with iron sulfides and gangue; exact identification requires testing

Iron-rich sandstone or weathered laterite fragment

Quartz-rich sandstone, possibly ferruginous sandstone (SiO₂ with iron oxides such as hematite/goethite)

Native Copper

Native Copper (Cu)

Aura Quartz

Silicon Dioxide (SiO2) with Titanium/Metal vapor coating

Graphite-rich schist (probable graphite flake)

Graphite (C) in graphitic schist; commonly with quartz, mica, and feldspar

Quartz-bearing sulfide ore, possibly pyrite in altered host rock

Likely pyrite (FeS₂) with quartz and possibly calcite or carbonate gangue; exact identification requires testing

Tourmalinated Quartz / Tourmaline in Matrix

Silicate mineral group (Schorl / Quartz)

Pyrite in Matrix (Fool's Gold)

Iron Disulfide (FeS2)

Iron-rich breccia or weathered limonite-bearing rock

Goethite–limonite ironstone, possibly ferruginous breccia

Bornite

Bornite (Cu5FeS4)

Graphite-rich metamorphic rock (probable graphite schist)

Graphite schist; predominantly graphite (C) with quartz and mica

Conglomeratic breccia (possibly polymictic volcanic breccia)

Polymictic breccia; clasts in a fine-grained volcanic or sedimentary matrix

Likely iron meteorite fragment

Iron–nickel meteorite, primarily kamacite and taenite (Fe–Ni alloy)

Vesicular basalt (scoria-like volcanic rock)

Vesicular basalt; predominantly plagioclase, pyroxene, and volcanic glass, with possible iron oxides

Sunstone

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

Pyrite-bearing rock (iron pyrite)

Pyrite, FeS₂, likely disseminated or massive in a host rock