Industrial Byproduct (Anthropogenic Rock)

Note on Image Identification: Textile

N/A (Anthropogenic material)

Cobalt Blue Glass / Cullet Glass

Silicon dioxide (Amorphous man-made glass)

Green sea glass (likely)

Anthropogenic glass, not a mineral; composition commonly soda–lime silicate glass

Blue Glass or Slag Glass

Amorphous Silica (Anthropogenic Glass)

Likely slag or metallic industrial byproduct

Unidentified iron-rich ferrous slag; possibly magnetite-bearing slag

Cobalt Glass Slug (Cullet)

Man-made Silicate Glass with Cobalt Oxide (CoO)

Synthetic Costume Accessory (Non-Geological)

Polyester and Acrylic Fiber (Anthropogenic polymer)

Ferrochrome Slag

Industrial Glassy Slag (Fe-Cr alloy byproduct)

Blue Slag Glass

Amorphous Silica (Byproduct of smelting)

Likely industrial slag or weathered basalt

Basaltic rock; possibly iron-rich furnace slag (diagnosis uncertain from image)

Stainless Steel (Polished)

Ferrous Alloy containing Iron (Fe), Chromium (Cr), and Carbon (C)

Likely weathered iron-rich rock or slag fragment

Indeterminate; possibly limonite/goethite-bearing rock (FeO(OH)·nH₂O) or industrial iron slag

Rounded metallic-looking pebble, likely iron-rich rock or slag

Uncertain; possible limonite/goethite-rich ironstone, hematite-bearing material, or industrial slag

Likely weathered iron-rich rock or slag fragment

Uncertain; possibly limonite/goethite-rich material (FeO(OH)·nH₂O)

Slag (Industrial By-product)

Anthropogenic Vitreous Silica/Iron Silicate

Cupronickel (on a 1981 Mexico 20 Pesos coin)

Copper-Nickel Alloy (Cu75Ni25)

Dark polished stone, likely basalt or slag-like volcanic rock

Probable fine-grained basalt; exact identification requires testing

Silicon Carbide (Carborundum)

Silicon Carbide (SiC)

Iron Slag

Iron Slag (Industrial Vitreous Material)

Asphalt (Bituminous Concrete)

Composite material (bitumen binder with mineral aggregate)

Aqua Aura Quartz

Silicon Dioxide (SiO2) bonded with Gold (Au)

Nutting Stone / Cupstone (Sandstone or Quartzite)

Sedimentary rock with anthropogenic modification (cupule)

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial Man-made)

Slag Glass

Amorphous Silicate (Man-made)

Lava Rock with Fabric Impression

Scoria or Basalt with anthropogenic impressions

Terrazzo (Synthetic Composite Rock)

Cementitious or Epoxy Resin-bound Aggregates

Slag Glass (Cullet)

Amorphous Silica (man-made), primarily SiO2 with trace metal oxides

Cullet Glass (Man-made Glass Slag)

Amorphous Silica (SiO2) with chemical additives

Asphalt (Aggregate)

Bituminous macadam / Concrete Aggregate

Painted River Rock

Anthropogenic-modified Siliciclastic Sedimentary Rock

Coal

Carbonaceous sedimentary rock

Ferrous Slag

Iron/Steel Slag (Complex Calcium-Alumino-Silicates)

Concrete with Exposed Aggregate

Anthropogenic conglomerate (Concrete)

Blue Slag Glass

Ferro-silicate glass (Slag)

Asphalt concrete

Anthropogenic conglomerate

Concrete / Anthropogenic Conglomerate

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

Chert (Arrowhead Shard)

Microcrystalline silica (SiO2)

Likely weathered metallic mineral or slag fragment

Uncertain; possibly limonite/goethite-coated iron mineral, or industrial iron slag

Ferrosilicon Slag (Industrial Vitrified Glass)

Vitreous Silicate Residue

Concrete fragment with Aggregate

Anthropogenic Concrete with Calcarious and Siliceous Aggregate

Green sea glass or green glass-like tumbled material

Amorphous silicate glass; likely anthropogenic soda-lime glass, not a natural mineral

Conglomerate (Asphaltic/Anthropogenic)

Clastic sedimentary rock / Bituminous mixture