Mineral (Processed Metal)

Tumbled dark stone, possibly hematite or black jasper

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

Carved green jade pendant or ornament

Likely jadeite (NaAlSi₂O₆) or nephrite (Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂); image alone cannot distinguish them

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) in matrix

Road-surface aggregate (crushed stone)

Unidentifiable mixed lithic aggregate; likely basaltic/andesitic fragments with feldspar, quartz, and weathered rock

Metallic sulfide ore specimen

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

Dyed Blue Agate (Dragon Vein Agate)

Silicon Dioxide (SiO2) with artificial cobalt/organic dyes

Slag Glass

Amorphous Silica Glass (with metal oxide inclusions)

Green Slag Glass

Amorphous Silica Glass (Anthropogenic)

Pyrite in Quartz

Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)

Mystic Topaz

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

Gold

Native Gold (Au)

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

Multiple (principally Silicon Dioxide SiO2 and Iron Disulfide FeS2)

Quartz pebble in concrete

Quartz (SiO₂), embedded in Portland-cement concrete

Tumbled turquoise-colored stone pendant

Undetermined; possibly dyed howlite or magnesite, or turquoise

Black Obsidian

Extrusive Volcanic Glass (primarily SiO2)

Pyrite

Iron Sulfide (FeS2)

Small metallic-looking mineral fragment

Unidentified from the image; possible native metal or metallic sulfide

Red Cubic Zirconia (Simulated Garnet)

Zirconium Dioxide (ZrO2)

Dyed Fuchsia Tiger’s Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Iron Slag

Ferrous Slag (Industrial Byproduct)

Greenish weathered volcanic rock, likely altered basalt

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

Faceted clear gemstone in a gold-tone ring

Likely colorless quartz (SiO₂); the image does not establish the stone identity, and glass or another gem is possible

Rutilated quartz (likely a cabochon set in metal)

Quartz, SiO₂, containing rutile inclusions (TiO₂)

Note: Item is not a geological specimen

Guitar Components (Steel, Nickel, Plastic, Wood)

Slag

Anthropogenic Vitreous Silica/Iron oxides

Rough Aquamarine

Beryl (Be₃Al₂Si₆O‑₁₈)

Bauxite Ore

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

Titanium Coated Aura Quartz (Apple Aura Quartz)

Silicon Dioxide (SiO2) with Metallic Vapor Deposition Coating

Slag

Anthropogenic silicate slag

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Native Copper in Basalt

Cu (Native Copper) in Mafic Igneous Rock

Lepidolite in Quartz

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

Serpentinite

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

Opalite

Synthetic glass / Opalized glass

Dyed Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Quartzite pebble

Meta-quartzite (SiO2)

Polished black obsidian

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

Blue Goldstone

Auraventurine (Synthetic glass with cobalt and copper inclusions)

Pyrite-rich sulfide ore (likely pyrite with chalcopyrite)

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

Copper Ore (Malachite and Azurite on Host Rock)

Cuprite, Malachite, and Azurite dissemination in gangue

Tumbled brown banded jasper

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

Satin spar gypsum (selenite)

Gypsum, CaSO₄·2H₂O