Anthropic Metallic Specimen

Possible iron-rich meteorite fragment

Unclassified stony-iron or iron meteorite; exact identification requires testing

Fluorite

Calcium Fluoride (CaF2)

Iron-rich quartzite or weathered ironstone pebble

Quartzite, chiefly SiO₂, with iron-oxide minerals (hematite/goethite)

Gold

Native Gold (Au)

Peacock Ore

Bornite (Cu5FeS4)

Likely mica-rich schist

Mica schist, probably muscovite–biotite schist with quartz and feldspar

Weathered volcanic rock, likely andesite or basalt

Fine-grained mafic to intermediate volcanic rock; probable andesite–basalt, compositionally dominated by plagioclase with pyroxene and possibly alteration minerals

Tiger's Eye (often misinterpreted as Gold Ore in this context)

Pseudomorph of Quartz after Crocidolite (SiO2)

Gold Flakes in Oil (Novelty Specimen)

Native Gold (Au)

Hematite

Iron(III) oxide (Fe2O3)

Hematite

Iron(III) oxide (Fe2O3)

Possible chalcopyrite-bearing sulfide fragment

Likely chalcopyrite (CuFeS₂), possibly with pyrite or bornite

Rainbow Fluorite

Calcium Fluoride (CaF2)

Iron-stained quartz-rich sulfide ore (probable gold-bearing quartz vein)

Quartz (SiO₂) with iron oxides/hydroxides, chiefly hematite–goethite; possible pyrite remnants

Iron-stained quartzite or quartz-rich rock

Quartzite, predominantly crystalline SiO₂, with iron-oxide minerals such as hematite and goethite

Iron-rich meteorite candidate

Possibly an iron meteorite or stony-iron meteorite; unverified Fe–Ni alloy

Iron Meteorite (likely Chondrite or Iron-Nickel fragment)

Siderite (Iron Meteorite), primarily Fe-Ni (Iron-Nickel) alloy

Green Fluorite

Calcium Fluoride (CaF2)

Pyrite with galena and sphalerite

Pyrite (FeS₂), commonly intergrown with galena (PbS) and sphalerite (ZnS)

Hematite

Iron(III) oxide (Fe2O3)

Possible weathered iron-rich rock or breccia

Indeterminate; likely iron-oxide-stained silicate rock, possibly basaltic breccia or limonite-bearing material

Tumbled metallic sulfide specimen, likely chalcopyrite

Chalcopyrite (CuFeS₂), possibly polished or coated

Native Gold

Native Gold (Au)

Rutilated Quartz Sphere

Silicon Dioxide with Titanium Oxide inclusions (SiO2 with TiO2)

Gold Nugget

Native Gold (Au)

Specular hematite (likely with magnetite/goethite)

Hematite, Fe₂O₃; associated iron oxides may include magnetite, Fe₃O₄, and goethite, FeO(OH)

Gold

Native Gold (Au)

Native Copper in Basalt

Amygdaloidal Basalt with Native Copper (Cu)

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Pyrite (iron pyrite)

Iron sulfide, FeS₂; cubic crystal system

Sunstone Quartz / Aventurine Quartz

Silicon Dioxide (SiO2) with inclusions

Gold Ore

Auriferous Quartz and Sulfide Mineralization in Host Rock

Tumbled dark metallic mineral specimen

Likely hematite or magnetite; identification is uncertain from the photograph

Pyrite Geode (Sparkling Druzy)

Iron Sulfide (FeS2) in Sedimentary Nodule

Marcasite on Agate / Sphalerite-Pyrite Agate Geode Slice

Marcasite (FeS2) / Pyrite on Quartz (SiO2)

Likely serpentine and polished hematite

Serpentine-group minerals, commonly antigorite/lizardite; hematite, Fe₂O₃

Standing Liberty Quarter (Silver Specimen)

Native Silver alloy (Ag with Cu traces)

Quartz Vein in Host Rock

Silicon dioxide (SiO2) veining in silicate matrix

Galena

Galena (lead sulfide, PbS), possibly a galena-rich ore specimen

Hematite

Hematite (Fe₂O₃), likely a polished specular hematite palm stone

Labradorite

Labradorite (Plagioclase Feldspar Series) - (Ca, Na)(Al, Si)4O8

Hematite bead bracelet

Hematite (Fe₂O₃), likely polished or magnetically enhanced beads