Anthropic Metallic Specimen

Iron-stained quartz-rich rock, likely quartzite

Quartzite, predominantly quartz (SiO₂), with iron-oxide staining

Galena (likely)

Galena, lead sulfide (PbS)

Quartz with Pyrite and Iron Staining

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

Likely rough pyrite specimen

Pyrite (FeS₂)

Titanium Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Tumbled pyrite (likely)

Pyrite, FeS₂; possibly a pyrite-rich sulfide specimen

Lapis Lazuli (Low-grade)

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

Galena (lead ore)

Galena, PbS (lead sulfide)

Pyrite-bearing rock, likely schist or quartzite

Pyrite (FeS₂) in a foliated silicate matrix, possibly mica schist

Magnetite (likely in Hematite or Ironstone)

Magnetite (Fe3O4)

Iron-rich breccia or hematite-bearing jasper

Hematite–quartz jasper (silica-rich ironstone), possibly brecciated

Pyrite in Matrix (Quartz/Schist)

Iron Sulfide (FeS2)

Polished black stone, likely hematite

Hematite (Fe₂O₃), possibly black jasper or basalt

Basalt Beach Pebble

Basalt (Aphanitic Mafic Igneous Rock)

Pyrite-bearing rock, likely pyrite schist or phyllite

Quartz–mica-rich metamorphic rock with disseminated pyrite (FeS₂); exact rock type cannot be confirmed from the image

Sunstone

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

Likely mafic metamorphic rock with sulfide mineralization

Probable amphibolite or hornblende–biotite schist, locally bearing pyrite/other sulfides

Titanium Aura Quartz (Bismuth-coated Druzy)

Silicon Dioxide (SiO2) with Titanium/Metal vapor coating

Raw Sunstone

Sunstone (Feldspar variety, (Ca,Na)((Al,Si)2Si2O8))

Amazonite

Microcline (KAlSi3O8)

Galena-rich sulfide specimen

Galena (lead sulfide, PbS), possibly with sphalerite and oxidized sulfides

Weathered metallic-looking rock, possibly hematite-bearing ironstone

Hematite-rich ironstone; hematite Fe₂O₃, potentially with magnetite Fe₃O₄ and quartz

Likely biotite-rich mica schist

Mica schist, chiefly biotite (K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂); exact identification from image is uncertain

Small dark mineral/rock fragment

Indeterminate; possibly biotite-rich schist, graphite, or metallic sulfide

Peacock Ore (Bornite or Iridescent Chalcopyrite)

Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2) with oxidation

Pyrite (“fool’s gold”)

Pyrite, FeS₂; cubic iron sulfide

Schist (Greenschist / Mica Schist)

Schist (variable mineral composition, commonly containing quartz, feldspar, mica, chlorite)

Gossan / Iron-Rich Weathered Rock

Hydrated Iron Oxides / Limonite / Goethite

Weathered pyrite-bearing schist or sulfide-rich metamorphic rock

Quartz–mica schist with disseminated pyrite and iron-oxide weathering

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Iridescent quartz-bearing rock, likely bornite/chalcopyrite-bearing quartzite

Quartz (SiO₂) with probable chalcopyrite (CuFeS₂) and/or bornite (Cu₅FeS₄)

Pyrite Nodules / Weathered Pyrite

Iron Sulfide (FeS2)

Pyrite (likely)

Iron disulfide, FeS₂; commonly called fool’s gold

Likely hematite-rich iron ore

Hematite (Fe₂O₃), possibly with magnetite and/or goethite

Tiger Iron

Composite rock (Quartz, Tiger's Eye, Hematite, and Jasper)

Pyrite

Iron Sulfide (FeS2)

Specular hematite (specularite)

Hematite, iron(III) oxide (Fe₂O₃), micaceous/specular variety

Likely galena-bearing ore specimen

Galena (PbS), possibly with quartz or calcite gangue

Likely hematite-rich iron ore or magnetite-bearing stone

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

Likely weathered mafic rock (basalt or gabbro)

Basalt–gabbroic rock; chiefly plagioclase feldspar, pyroxene, and possibly olivine

Hypersthene

Hypersthene ((Mg,Fe)SiO3)

Coal

Carbonaceous sedimentary rock (C)