Anthropic Metallic Specimen

Pyrite (likely)

Iron disulfide, FeS₂; commonly called fool’s gold

Titanium Amethyst Geode

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

Iron-rich quartzite or weathered ironstone

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

Polished black granite with golden sulfide veining

Likely gabbro or black granite containing pyrite/chalcopyrite; exact identification requires testing

Possible iron-rich concretion or weathered ironstone

Goethite/hematite-bearing limonite concretion (tentative)

Hematite

Hematite (Fe2O3)

Basalt River Stone

Aphanitic Mafic Igneous Rock

Pyrite

Iron Pyrite (FeS2)

Pyrite (on Quartz/Sulfide matrix)

Iron Sulfide (FeS2)

Hematite (specular hematite)

Hematite, α-Fe₂O₃ (iron(III) oxide)

Pyrite-bearing schist (likely gold- or sulfide-bearing ore)

Pyrite, FeS₂, in micaceous schist; exact identification requires testing

Weathered sulfide-bearing rock, likely pyrite-rich schist

Pyrite (FeS₂) in mica/quartz-rich schist; exact identification requires testing

Quartz-rich breccia or silicified rock with metallic sulfide mineralization

Microcrystalline and crystalline SiO₂, likely quartz/chalcedony, with possible pyrite or other sulfides

Gold-bearing quartz vein ore

Native gold (Au) in quartz with iron-oxide alteration; likely limonite/goethite and possibly sulfides

Muscovite Mica Schist

Metamorphic rock rich in muscovite mica (KAl2(AlSi3O10)(F,OH)2)

Milky quartz (likely iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

Metallic sulfide-bearing rock, likely galena-rich ore

Galena (lead sulfide, PbS), possibly mixed with pyrite/chalcopyrite and host rock

Gossan (Iron Hat)

Limonitic Gossan (Fe-oxide/hydroxide complex)

Peacock Ore

Bornite (Cu5FeS4) or Chalcopyrite treated with acid

Pyrite

Iron Sulfide (FeS2)

Copper-Bearing Sulfide Ore (likely Chalcopyrite or Bornite)

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

Sunstone

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

Iron-stained quartz-rich rock, possibly brecciated quartzite or rhyolite

Indeterminate quartz–feldspar rock with iron-oxide staining (SiO₂-rich; possible hematite/goethite)

Green Fluorite

Calcium fluoride (CaF2)

Raw Fluorite

Calcium Fluoride (CaF2)

Pyrite-bearing metamorphic rock (probable pyrite schist)

Schist containing pyrite (FeS₂), with probable quartz and mica

Pyrite with quartz

Pyrite (FeS₂) with quartz (SiO₂), possibly minor chalcopyrite

Specular hematite-bearing metamorphic rock (likely micaceous schist)

Hematite–quartz–mica schist; iron oxide primarily hematite (Fe₂O₃), possibly with magnetite (Fe₃O₄)

Likely copper ore (native copper or copper-rich mineral)

Possibly native copper (Cu); exact identification is uncertain from the image

Unidentified dark metallic sulfide specimen

Possibly pyrite-, chalcopyrite-, or galena-bearing ore; exact identification requires testing

Quartz vein specimen, likely milky quartz with iron-stained host rock

Quartz (SiO₂), possibly with chalcedony and sulfide/oxide-bearing matrix

Labradorite

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

Pyrite

Iron Sulfide (FeS2)

Likely galena (lead ore)

Galena, PbS (lead sulfide)

Pyrite (Tumbled)

Iron Disulfide (FeS2)

Amazonite

Potassium Aluminum Silicate (KAlSi3O8)

Mixed Mineral Collection (with Titanium Aura Quartz)

Silicon Dioxide (SiO2) with metallic coatings and various silicates

Carborundum (Silicon Carbide)

Silicon Carbide (SiC)

Mica Schist with Garnet

Almandine-Mica Schist

Milky Quartz with Mica and Pyrite

Quartz (SiO2) with Muscovite (KAl2(AlSi3O10)(OH)2) and Pyrite (FeS2)

Pyrite

Iron Sulfide (FeS2)

Pyrite-bearing rock (likely pyrite-rich sulfide ore)

Pyrite, FeS₂, with possible dark host rock; exact matrix is not identifiable from the photo