Anthropic Metallic Specimen

Basalt

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Ironstone (Limonite/Hematite)

Ferruginous Sedimentary Rock (composed largely of Fe2O3 and FeO(OH)·nH2O)

Basalt

Basalt (Mafic volcanic rock)

Basalt

Basalt

Ironstone concretion

Siderite or Limonite concretion (FeCO3 or FeO(OH)·nH2O)

Basalt

Basalt

Basalt

Basalt

Basalt

Mafic Igneous Rock (Basalt)

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Basalt

Basalt

Basalt

Basalt (extrusive volcanic rock)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Banded Iron Formation (BIF)

Banded Iron Formation

Quartz with Mica inclusion

Silicon Dioxide (SiO2) with Muscovite/Biotite inclusions

Fluorite

Calcium Fluoride (CaF2)

Anthracite Coal

Anthracite

Botryoidal Hematite (Kidney Ore)

Iron(III) oxide (Fe2O3)

Chalcopyrite (Peacock Ore)

Chalcopyrite (CuFeS2)

Labradorite

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

Moss Agate and Hematite

Silica (SiO2) with fibrous inclusions of Manganese or Iron; Hematite (Fe2O3)

Bismuth Crystal

Bismuth (element symbol Bi, atomic number 83)

Native Silver

Silver (Ag)

Black Pearl (Tahitian Pearl)

Aragonite / Calcite (CaCO3) with Conchiolin

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Pyrite

Iron Sulfide (FeS2)

Anthracite Coal

Anthracite coal (High-rank coal)

Limonite Concretion (Ironstone)

Limonite (FeO(OH)·nH2O) / Goethite

Hematite

Iron(III) oxide (Fe2O3)

Gold Nugget

Native Gold (Au)

Carbonado (Black Diamond)

Carbonado (Polycrystalline Diamond)

Fluorite (Green Fluorite)

Calcium Fluoride (CaF2)

Basalt

Basalt

Schist

Mica Schist

Muscovite Mica Schist

Muscovite Schist (KAl2(AlSi3O10)(OH)2)

Basalt

Extrusive mafic igneous rock

Pyrite

Iron Sulfide (FeS2)

Vesicular Basalt

Basalt with vesicular texture

Pyrite

Iron Sulfide (FeS2)

Bituminous Coal

Bituminous coal (Organic Sedimentary Rock)

Pyrite

Iron Sulfide (FeS2)

Bismuth

Bismuth (Bi)