Anthropic Metallic Specimen

Cupronickel Coin

Copper-Nickel Alloy (typically 75% Cu, 25% Ni)

Sandstone-based Concrete Fragment

Cementitious Composite with Sedimentary Aggregate

Fired Clay Brick (Anthropic Rock substitute)

Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)

Pyrite with Vesicular Matrix

Iron Disulfide (FeS2)

Hematite Nodules (Moqui Marbles style)

Iron Oxide (Fe2O3)

Hematite

Iron(III) oxide (Fe2O3)

Metallic sulfide mineral specimen, likely pyrite

Pyrite (FeS₂), possibly mixed with marcasite or another iron sulfide

Pyritic Quartzite

Quartzite with Pyrite inclusions (FeS2)

Micrometeorite (Spherule)

Extraterrestrial Accretion Spherule

Likely iron meteorite fragment

Fe–Ni metallic meteorite, possibly an octahedrite (kamacite–taenite alloy)

Unidentified metallic mineral or meteorite fragment

Indeterminate; possible native metal-bearing sulfide or iron meteorite fragment

Likely polished copper-bearing stone or copper nugget

Uncertain from the image; possibly native copper (Cu) or copper-stained rock

Likely metallic ore specimen

Undetermined; the silvery, reflective surface may indicate specular hematite (Fe₂O₃), but the image is insufficient for reliable identification.

Likely pyrite-bearing rock fragment

Pyrite (FeS₂), possibly in a weathered host rock; identification is uncertain from the image

Likely bornite (“peacock ore”)

Bornite, Cu₅FeS₄

Mixed mineral specimens, prominently chalcopyrite and amethyst

Chalcopyrite (CuFeS₂) with secondary copper minerals; amethyst, purple quartz (SiO₂)

Pyrite in Quartz (Drill Core)

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

Galena (lead ore)

Galena, PbS (lead sulfide)

Native metallic specimen, possibly galena or a sulfide-rich ore fragment

Tentatively galena (lead sulfide, PbS), possibly mixed with iron/copper sulfides

Likely native metallic mineral specimen

Uncertain from photograph; possibly pyrite (FeS₂) or a sulfide-rich metallic ore

Uncertain dark metallic mineral specimen

Possibly galena (lead sulfide, PbS), though the image is too blurred for reliable identification

Pyrite Cubes in Matrix

Iron Disulfide (FeS2) in Host Matrix

Native copper

Copper (Cu), commonly with cuprite and malachite alteration

Hematite

Iron(III) oxide (Fe2O3)

Magnetite / Hematite mix

Magnetite (Fe3O4) and Hematite (Fe2O3)

Native silver specimen (probable)

Silver, Ag; possibly silver-bearing sulfide or electrum

Metallic sulfide mineral fragment, likely bornite or chalcopyrite

Bornite (Cu₅FeS₄) or chalcopyrite (CuFeS₂)

Hematite

Iron(III) oxide (Fe2O3)

Rainbow chalcopyrite (“peacock ore”)

Chalcopyrite, CuFeS₂, commonly artificially tarnished or heat-treated

Quartz-bearing Pegmatite with Metallic Sulfides

Pegmatite / Quartz-Feldspar Matrix with Pyrite and Mica

Hematite

Iron(III) oxide (Fe2O3)

Pyritic Quartzite

Metequartzite with FeS2 (Pyrite) inclusions

Raw dark metallic mineral specimen, possibly native gold-bearing quartz or sulfide ore

Uncertain from image; possible pyrite/chalcopyrite-bearing quartz or gold-bearing sulfide matrix

Pyrite Schist

Metamorphic rock containing FeS2 (Pyrite) with mica and quartz

Hematite

Hematite (Fe2O3)

Botryoidal Hematite

Hematite (Iron(III) oxide, Fe2O3)

Metallic Ornament / Jewelry

N/A - This is an artificial object, not a geological specimen.

Native gold (small nugget or grain)

Native gold, Au

Unidentified metallic-looking mineral fragment

Indeterminate; possible galena, magnetite, or metal-rich sulfide/ore fragment

Galena (probable)

Galena, lead sulfide (PbS)

Muscovite Schist

Mica Schist (KAl2(AlSi3O10)(OH)2 matrix)

Galena-bearing metamorphic rock (tentative)

Likely galena (PbS) with quartz and/or carbonate matrix; exact identification requires testing