Synthetic (Man Made Glass)

Synthetic Resin (Artificial Specimen)

Polyurethane or Polyester Resin

Gemstone jewelry ensemble

Likely mixed gemstone and glass-bead jewelry; exact stones cannot be determined from the image

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Obsidian (likely black volcanic glass)

Obsidian; primarily amorphous volcanic silica glass, approximately SiO₂-rich rhyolitic composition

Iron Slag (Industrial Byproduct)

Anthropogenic Vitrification Product/Ferrous Slag

Polished black stone, likely obsidian

Obsidian (volcanic glass; mostly silica-rich rhyolitic composition)

Rainbow Hematite Ring

Iron(III) oxide (Fe2O3) with thin-film coating

Concrete with Aggregate

Artificial Conglomerate (Cement and Aggregate)

Concrete / Anthropogenic Conglomerate

Man-made composite material (Portland cement, aggregate, and water)

Polished black pebble, possibly obsidian

Volcanic glass (obsidian), likely; identification is tentative from the image

Fluorite (Polished Point/Tower)

Calcium Fluoride (CaF2)

Blue-beaded gemstone jewelry, likely lapis lazuli or dyed blue agate

Uncertain from the image; possible lazurite-bearing lapis lazuli (Na₃Ca(Si₃Al₃)O₁₂S) or blue chalcedony (SiO₂)

Unidentified polished dark gemstone cabochon

Possibly hematite, obsidian, jet, or dark agate; image insufficient for a definitive identification

Diamond / Clear Quartz / Glass paste

Carbon (Diamond) / Silicon Dioxide (Quartz)

Ferrochrome Slag

Anthropogenic slag (Fe-Cr alloy waste)

Terrazzo (Synthetic Composite Rock)

Cementitious or Epoxy Resin-bound Aggregates

White pebble, likely quartz or calcite

Indeterminate from image; possible microcrystalline quartz (SiO₂) or calcite (CaCO₃)

Diamond

Native Carbon (C)

Conglomerate

Conglomerate (clastic sedimentary rock)

Slag

Ferrous Slag (Amorphous calcium-magnesium-aluminum silicates)

Concrete / Conglomerate (Man-made)

Artificial Conglomerate (Cementitious Composite)

Green glassy mineral fragment, possibly fluorite

Fluorite (calcium fluoride, CaF₂), tentative identification

Aluminum Slag

Anthropogenic Aluminum (Al)

Dzi Bead (Etched Chalcedony)

Cryptocrystalline Quartz (SiO2) with chemical etching

Slag (Industrial Glass/Glassy Rock)

Anthropogenic Vitreous Material

Synthetic Marbled Aggregate (Footwear Component)

Ethylene-vinyl acetate (Croslite™)

Green sea glass (likely slag glass or bottle glass)

Man-made soda-lime silicate glass; not a naturally occurring mineral

Concrete rubble

Anthropogenic conglomerate

Lava Rock with Fabric Impression

Scoria or Basalt with anthropogenic impressions

Milky quartz (rough fragment)

Quartz, silicon dioxide (SiO₂)

Libyan Desert Glass

Impact-melt silica glass (SiO2 + traces of Al, Fe, Ti)

Blue sea glass or blue glassy mineral fragment

Uncertain; likely man-made soda-lime glass, not a natural mineral

Ferro-slag (Leland Blue/Slag Glass)

Anthropogenic Vitreous Silica (Industrial Slag)

Goldstone (likely red/brown aventurine glass)

Man-made aventurine glass; copper-bearing silicate glass (not a natural mineral)

Titanium Aura Quartz

Silicon Dioxide (SiO2) coated with Titanium and Niobium

Concretion with Geode Cavity

Ferruginous Sandstone Concretion with Quartz Center

Concrete fragment or Conglomerate

Artificial Conglomerate (Concrete) or Natural Conglomerate

Likely clear quartz crystal or glass-like gemstone

Quartz, silicon dioxide (SiO₂); exact identification is uncertain from the strongly magenta-lit image

Slag

Anthropogenic Vitreous Silica/Iron oxides

Blue cabochon gemstone, likely synthetic spinel or glass

Undetermined; possible synthetic cobalt-blue spinel (MgAl₂O₄) or colored glass

Dalmatian Stone

Dalmatian Jasper (a misnomer for an Aplite with Arfvedsonite spots)

Green Sea Glass

Amorphous Silica (man-made glass), SiO2 + additive metal oxides