Anthropic Metallic Specimen

Pyrite

Iron Sulfide (FeS2)

Titanium Amethyst Geode

Silicon Dioxide (SiO2) with Titanium/Metal Vapor Deposition Layer

Pyrite

Iron Sulfide (FeS2)

Likely galena-bearing ore specimen

Galena (PbS), possibly with quartz or calcite gangue

Gossan (Iron Hat)

Limonitic Gossan (Fe-oxide/hydroxide complex)

Pyrite

Iron Sulfide (FeS2)

Copper-Bearing Sulfide Ore (likely Chalcopyrite or Bornite)

Chalcopyrite (CuFeS2) or Bornite (Cu5FeS4) in host rock

Lapis Lazuli (Low-grade)

Lapis Lazuli (Aggregate of Lazurite, Calcite, and Pyrite)

Mica Schist

Mica-rich Schist containing Muscovite and Quartz

Schorl (Black Tourmaline) in Quartz and Feldspar

NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)

Mica Schist

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

Coal

Carbonaceous sedimentary rock (C)

Iron-rich quartzite or weathered ironstone

Quartzite dominated by quartz (SiO₂), with iron oxides/hydroxides such as hematite and goethite

Mixed Mineral Collection (with Titanium Aura Quartz)

Silicon Dioxide (SiO2) with metallic coatings and various silicates

Quartz-rich pegmatite, possibly with mica and iron staining

Quartz (SiO₂) with probable muscovite/biotite mica and minor iron oxides

Quartzite (Milky Quartzite)

Quartzite (SiO2 silicon dioxide)

Sunstone

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

Copper

Native Copper (Cu)

Pyrite (Tumbled)

Iron Disulfide (FeS2)

Hypersthene

Hypersthene ((Mg,Fe)SiO3)

Possible iron-rich concretion or weathered ironstone

Goethite/hematite-bearing limonite concretion (tentative)

Hematite

Hematite (Fe2O3)

Basalt River Stone

Aphanitic Mafic Igneous Rock

Peacock Ore

Bornite (Cu5FeS4) or Chalcopyrite treated with acid

Basalt

Extrusive igneous rock

Basalt River Pebble

Aphanitic Mafic Volcanic Rock (Basalt)

Copper ore, likely native copper in a host rock

Native copper (Cu), possibly with cuprite/iron-oxide matrix

Sunstone

Plagioclase Feldspar (Na,Ca)(Si,Al)3O8

Basalt

Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)

Unknown metallic sulfide-bearing rock, possibly chalcopyrite or bornite

Tentative: chalcopyrite (CuFeS₂) or bornite (Cu₅FeS₄)

Gold Nugget

Native Gold (Au)

Silver Nugget

Native Silver (Ag)

Silver (Native Element)

Ag (Argentum) - 90% Silver, 10% Copper alloy in specimen

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Quartz with Pyrite and Iron Staining

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

Sunstone (Feldspar)

(Ca,Na)((Al,Si)2Si2O8) with inclusions of Hematite or Goethite

Sunstone

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

Unidentified gray rock/mineral specimen

Indeterminate; possibly quartz-rich rock or a metallic sulfide-bearing specimen

Carborundum (Silicon Carbide)

Silicon Carbide (SiC)

Basalt Beach Pebble

Basalt (Aphanitic Mafic Volcanic Rock)

Likely hematite-rich iron ore or magnetite-bearing stone

Hematite (Fe₂O₃), possibly mixed with magnetite (Fe₃O₄) and silicate gangue

Schorl (Black Tourmaline) in Quartz/Feldspar Matrix

NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)