Anthropic Metallic Specimen

Purple fluorite cluster with metallic sulfide inclusions

Fluorite, calcium fluoride (CaF₂), likely with pyrite or chalcopyrite inclusions

Hematite

Iron(III) oxide (Fe2O3)

Sunstone

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

Gold-bearing Quartz

Lode Gold in Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Pyrite

Iron Sulfide (FeS2)

Milky Quartz with Mica (Gneiss/Schist influence)

Silicon Dioxide (SiO2) with Phyllosilicates

Pyritic Gneiss (with Garnet)

Gneiss containing Pyrite (FeS2) and Almandine Garnet (Fe3Al2(SiO4)3)

Biotite Schist

Schist (Biotite-dominated)

Basalt

Basalt (Mafic volcanic rock)

Fluorite on Host Rock

Calcium Fluoride (CaF2)

Garnet Schist

Almandine Garnet in Micaceous Schist

Gold Ore

Native Gold (Au)

Bornite

Bornite (Cu5FeS4)

Native gold nugget (probable)

Native gold, Au; possibly gold-bearing quartz

Galena

Galena (lead sulfide, PbS)

Hematite

Ferric oxide (Fe2O3)

Dendritic Agate (River Pebble)

Silicon Dioxide (SiO2) with Manganese or Iron oxide inclusions

Ironstone / Hematite Concretion

Iron oxide / Fe2O3

Basalt

Basalt (extrusive volcanic rock)

Basalt

Basalt (composition of plagioclase feldspar, pyroxene, and olivine)

Basalt Pebble

Basalt (Extrusive Mafic Igneous)

Peacock ore (iridescent chalcopyrite)

Chalcopyrite, CuFeS₂, commonly surface-treated to enhance iridescence

Green Aventurine

Quartz (SiO2) with fuchsite inclusions

Pyrite

Iron Pyrite (FeS2)

Bornite

Cu5FeS4 (Copper Iron Sulfide)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Pyrite

Iron Disulfide (FeS2)

Native Gold Nugget

Native Gold (Au)

Basalt River Pebble

Basalt (Mafic Volcanic Rock)

Likely weathered basalt or dark volcanic rock

Basalt; primarily plagioclase feldspar and pyroxene, with possible olivine and iron oxides

Tumbled sodalite

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

Gold Nugget

Native Gold (Au)

Native Copper

Native Copper (Cu)

Pyrite

Iron Sulfide (FeS2)

Ironstone Concretion (Boji Stone/Moqui Marble type)

Goethite/Hematite-encrusted Sandstone Concretion

Amethyst geode fragment

Quartz, SiO₂; purple color from irradiation-related iron impurities

Pyrite

Iron Disulfide (FeS2)

Galena-bearing sulfide ore

Galena (lead sulfide, PbS), possibly with sphalerite and/or pyrite

Iron-rich concretion or weathered ironstone

Limonite/goethite-rich ironstone; commonly approximated as hydrated iron oxides (FeO(OH)·nH₂O)

Arfvedsonite

Arfvedsonite [Na3(Fe2+)4Fe3+Si8O22(OH)2]

Titanium-coated Metal Cube (Man-made Fidget Toy)

Titanium-anodized or electroplated alloy (e.g., Ti-coated Zinc or Aluminum)