Mineral (Processed Metal)

Pyrite in Quartz

Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)

Blue Goldstone

Man-made glass with cobalt and metal flecks

Dyed Blue Agate (Dragon Vein Agate)

Silicon Dioxide (SiO2) with artificial cobalt/organic dyes

Ferrochrome Slag

Anthropogenic slag (Fe-Cr alloy waste)

Serpentinite

Serpentinite (composed largely of serpentine minerals like antigorite, lizardite, or chrysotile)

Green Slag Glass

Amorphous Silica Glass (Anthropogenic)

Tumbled dark stone, possibly hematite or black jasper

Uncertain; likely hematite (Fe₂O₃) or fine-grained chalcedony/jasper (SiO₂)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) in matrix

Mystic Topaz

Aluminum silicate fluoride hydroxide with titanium coating (Al2SiO4(F,OH)2)

Metallic sulfide ore specimen

Likely pyrite-bearing massive sulfide, possibly pyrrhotite or galena; exact identification requires testing

Blue Goldstone

Aventurine Glass (Silicon Dioxide with metal inclusions)

Quartz pebble in concrete

Quartz (SiO₂), embedded in Portland-cement concrete

Black Obsidian

Extrusive Volcanic Glass (primarily SiO2)

Cubic Zirconia (Man-made)

Cubic Zirconia (ZrO2) with Enamel and Metal Alloy

Mixed Tumbled Gemstones (Agate, Aventurine, Pyrite, etc.)

Multiple (principally Silicon Dioxide SiO2 and Iron Disulfide FeS2)

Pyrite

Iron Sulfide (FeS2)

Tumbled turquoise-colored stone pendant

Undetermined; possibly dyed howlite or magnesite, or turquoise

Greenish weathered volcanic rock, likely altered basalt

Altered basalt/mafic volcanic rock; green coloration may reflect chlorite, epidote, or celadonite

Opalite

Synthetic glass / Opalized glass

Rutilated quartz (likely a cabochon set in metal)

Quartz, SiO₂, containing rutile inclusions (TiO₂)

Dyed Fuchsia Tiger’s Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Titanium Coated Aura Quartz (Apple Aura Quartz)

Silicon Dioxide (SiO2) with Metallic Vapor Deposition Coating

Polished black obsidian

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

Rough Aquamarine

Beryl (Be₃Al₂Si₆O‑₁₈)

Note: Item is not a geological specimen

Guitar Components (Steel, Nickel, Plastic, Wood)

Red Cubic Zirconia (Simulated Garnet)

Zirconium Dioxide (ZrO2)

Iron Slag

Ferrous Slag (Industrial Byproduct)

Slag

Anthropogenic Vitreous Silica/Iron oxides

Slag Glass

Amorphous Silica Glass (with metal oxide inclusions)

Serpentinite

Serpentinite (composed largely of serpentine group minerals including Antigorite, Lizardite, and Chrysotile, (Mg,Fe)3Si2O5(OH)4)

Bauxite Ore

Hydrated aluminum oxides (e.g., Gibbsite Al(OH)3, Boehmite ̲̲̲̲AlOOH, Diaspore ̲̲̲̲AlOOH)

Copper Ore (Malachite and Azurite on Host Rock)

Cuprite, Malachite, and Azurite dissemination in gangue

Lepidolite in Quartz

K(Li,Al)3(Si,Al)4O10(F,OH)2 / SiO2

Tumbled brown banded jasper

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

Blue Calcite

Calcium Carbonate (CaCO3)

Pyrite-rich sulfide ore (likely pyrite with chalcopyrite)

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

Copper and Quartz beads

Native Copper (Cu) and Crystalline Quartz (SiO2)

Blue Goldstone

Auraventurine (Synthetic glass with cobalt and copper inclusions)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Tumbled yellow-green chalcedony or serpentine

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

Satin spar gypsum (selenite)

Gypsum, CaSO₄·2H₂O

Dyed Agate

Silicon Dioxide (SiO2) - Chalcedony variety