Anthropic Metallic Specimen

Galena (likely)

Galena, lead sulfide (PbS)

Gold-bearing quartz sulfide specimen

Native gold (Au) with quartz (SiO₂), likely associated with iron sulfides such as pyrite

Native copper nugget

Native copper (Cu)

Possible iron meteorite fragment

Iron–nickel meteorite, likely kamacite–taenite alloy

Pyrite-rich Volcanic Rock

Iron Disulfide (FeS2) in Volcanic Matrix

Gold Leaf in Glass Vial

Gold (Au)

Iron-rich laterite or weathered ironstone

Goethite–hematite-bearing ferruginous duricrust; commonly approximated as FeO(OH) and Fe₂O₃

Pyrite-bearing metamorphic rock (likely schist or quartzite)

Pyrite (FeS₂) in a quartz-rich host rock, possibly mica schist

Possible industrial slag or basaltic volcanic glass

Likely iron-rich vitreous slag; natural alternative: basaltic glass (tachylite)

Possible weathered metallic mineral specimen

Uncertain; possibly native copper-bearing rock or iron sulfide in a gray host matrix

Hematite

Hematite (Fe2O3)

Native Copper in Matrix

Native Copper (Cu)

Hematite Nodules (Moqui Marbles style)

Iron Oxide (Fe2O3)

Iron-rich rock, likely hematite/goethite-rich ironstone

Hematite (α-Fe₂O₃), possibly mixed with goethite (FeO(OH)) and gangue minerals

Likely pyrite-bearing rock

Pyrite (FeS₂), possibly in a quartz-rich matrix; exact identification is uncertain from the image.

Pyrite (fool’s gold)

Iron disulfide, FeS₂; usually cubic or pyritohedral crystals

Labradorite

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

Gold bearing Quartz with Sulfides

Auriferous Quartz with Pyrite/Arsenopyrite (Au + SiO2)

Hematite

Ferric Oxide (Fe2O3)

Gold Ore in Quartz

Auriferous Quartz (Au + SiO2)

Likely raw metallic mineral specimen

Unidentified; possibly galena-bearing ore or magnetite-rich rock

Chrysoprase- or serpentine-bearing quartz vein with pyrite

Quartz (SiO₂) with iron sulfide, chiefly pyrite (FeS₂), in altered Mg-rich rock; green material may be serpentine or nickel-bearing chalcedony

Pyrite-rich schist or phyllite

Quartz–mica schist/phyllite with disseminated pyrite (FeS₂)

Copper Ore (Malachite, Azurite, and Chalcopyrite in Host Rock)

Copper-bearing polymetallic mineral aggregate (Cu-minerals)

Small polished metallic mineral specimen

Indeterminate from image; possibly galena or hematite

Botryoidal hematite (ironstone)

Hematite, Fe₂O₃

Native Copper in Basalt

Cu

Azurite with native copper

Azurite (Cu₃(CO₃)₂(OH)₂) with native copper (Cu)

Magnetite / Iron-Rich Concretion

Magnetite (Fe3O4) or Bog Iron Limonite

Sunstone

Plagioclase Feldspar (containing (Ca,Na)(Al,Si)4O8 with Hematite or Copper inclusions)

Quartz crystal with Pyrite inclusions

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)

Silicon

Silicon (Si)

Pyritic Shale

Carbonaceous Shale with Iron Pyrite (FeS2)

Hematite

Iron Oxide (Fe2O3)

Hematite

Hematite (Fe2O3)

Pyrite-bearing rock, possibly pyrite schist or sulfide ore

Pyrite (iron disulfide, FeS₂), likely intergrown with dark metamorphic host minerals

Healer's Gold (Pyrite and Magnetite in Schist)

Magnetite (Fe3O4) and Pyrite (FeS2) in Mica Schist

Gold

Native Gold (Au)

Likely chalcopyrite-bearing sulfide ore

Chalcopyrite (CuFeS₂), possibly with pyrite and/or sphalerite

Magnetite (Lodestone)

Magnetite (Fe3O4)

Gold Ore

Native Gold in Quartz (Au)

Probable metallic meteorite fragment

Unclassified iron meteorite candidate, chiefly kamacite (α-Fe–Ni alloy)