Mineral (Processed Alloy)

Opalite

Synthetic glass / Opalized glass

Dyed Fuchsia Tiger’s Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Polished black obsidian

Volcanic glass; predominantly rhyolitic silica (SiO₂), with minor iron, magnesium, and alkalis

Tumbled brown banded jasper

Microcrystalline quartz (SiO₂), commonly chalcedony with iron-oxide inclusions

Native Copper

Native Copper (Cu)

Pyrite-rich sulfide ore (likely pyrite with chalcopyrite)

Pyrite, FeS₂; possible chalcopyrite, CuFeS₂, and minor quartz or sphalerite

Tumbled yellow-green chalcedony or serpentine

Microcrystalline quartz (SiO₂), possibly chrysoprase; alternative: serpentine-group mineral

Satin spar gypsum (selenite)

Gypsum, CaSO₄·2H₂O

Asphalt aggregate (crushed stone in bitumen)

Artificial composite; predominantly crushed granite, basalt, limestone, and/or recycled aggregate bound by bitumen

Dyed Pink Agate (Crackled)

Silicon Dioxide (SiO2) - Chalcedony variety

Concretion

Sedimentary Concretion (e.g., Siderite or Ironstone)

Crushed Granite and Quartz Gravel

Composite Igneous and Silicate Rock Aggregate

Iron Meteorite

Iron-Nickel Meteorite (primarily composed of kamacite and taenite alloys)

Unidentified gray mineral/rock fragment

Indeterminate from image; possibly quartz-rich material or mica-bearing schist

Tumbled lavender quartz (likely lepidolite-bearing quartz or dyed quartz)

Quartz, SiO₂; possible lepidolite mica inclusions

Quartz (Tumbled/Water-worn)

Silicon Dioxide (SiO2)

Gold (Processed)

Gold (Au)

Faceted blue gemstone ring, likely synthetic spinel or glass; identity uncertain

Possibly synthetic blue spinel (MgAl₂O₄) or laboratory sapphire (Al₂O₃); the clear side stones may be cubic zirconia or glass

Aquamarine

Beryl (Be3Al2Si6O18)

Iron Meteorite

Siderite (Iron-Nickel Alloy)

Cupronickel (on a 1981 Mexico 20 Pesos coin)

Copper-Nickel Alloy (Cu75Ni25)

Iron Meteorite

Siderite (Iron-Nickel Alloy)

Tumbled quartz (likely rose or milky quartz)

Quartz, silicon dioxide (SiO₂)

United States Quarter Dollar

Cupronickel Clad Alloy (75% Copper, 25% Nickel over a 100% Copper core)

Mixed gemstone bead strand, likely including agate, quartz, turquoise, and sandstone beads

Varied silicate and copper-mineral materials; exact bead identities cannot be confirmed visually

Dyed Quartz Crystals

Silicon Dioxide (SiO2) with artificial pigment

Green aventurine bead bracelet

Quartz (SiO₂), commonly green quartzite/aventurine colored by fuchsite mica or other inclusions

Amethyst bead bracelet

Amethyst, purple quartz (SiO₂)

Dyed red crystal aggregate, likely quartz or salt

Uncertain; possibly dyed quartz (SiO₂) or halite (NaCl)

Quartz-rich rock fragment (tentative)

Quartz, silicon dioxide (SiO₂), possibly in a weathered host rock

Tumbled pink feldspar (likely moonstone or orthoclase)

Potassium feldspar, chiefly orthoclase (KAlSi₃O₈); possibly adularescent moonstone

Man-made Ceramic / Clay Figurine

Aluminosilicate Ceramic (Processed Clay)

Unidentified dark, flat specimen

Indeterminate; image resolution is insufficient for mineral identification

Tumbled brown jasper (likely brecciated or scenic jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide inclusions

Polished orbicular jasper (likely ocean jasper)

Jasper, a microcrystalline variety of quartz (SiO₂), with iron-oxide and other mineral inclusions

Dyed Agate

Silicon dioxide, SiO2

Petrified Coral (Agatized Coral)

Fossilized Anthozoa (Silicon Dioxide replacement - SiO2)

Green cabochon gemstone pendant, likely turquoise or dyed green turquoise

Probably turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; exact identification requires testing

Cassiterite (Tin Ore)

Cassiterite (Tin(IV) Oxide, SnO2)

Cupronickel Coin

Copper-Nickel Alloy (typically 75% Cu, 25% Ni)

Satin Spar (Satin Spar Gypsum)

Calcium Sulfate Dihydrate (CaSO4·2H2O)

Heat-Treated Amethyst (Commercial Citrine)

Silicon Dioxide (SiO2) - Macro-crystalline Quartz