Industrial Byproduct (Anthropogenic Rock Like Material)

Red Slag Glass

Amorphous Silica (Industrial byproduct with metallic oxide dopants)

Green sea glass or green glass-like tumbled material

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

Asphalt Conglomerate

Artificial Bituminous Conglomerate

Ferrochrome Slag

Industrial Glassy Slag (Fe-Cr alloy byproduct)

Cobalt Glass Slug (Man-made Glass)

Amorphous Silica with Cobalt Oxide (SiO2 + CoO)

Metal Chain (Likely Steel or a Steel Alloy)

Steel (primarily iron and carbon); specific alloy unknown

Painted River Rock

Artificially Coated Sedimentary Rock

Slag (Industrial Glass/Metal Waste)

Artificial silicate/ferro-silicate byproduct

Asphalt (Bituminous pavement)

Bituminous concrete / Asphalt

Likely weathered iron-rich rock or slag fragment

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

Aggregate Concrete

Anthropogenic Conglomerate (Technosol)

Iron Slag

Iron Slag (Industrial Vitreous Material)

Slag Glass

SiO2 (Silicon Dioxide) with impurities

Cobalt Glass Slug (Cullet)

Man-made Silicate Glass with Cobalt Oxide (CoO)

Asphalt (Bituminous Concrete)

Composite material (bitumen binder with mineral aggregate)

Red Slag Glass (Cullet)

Amorphous Silicon Dioxide (SiO2) with metallic dopants

Blue Glass or Slag Glass

Amorphous Silica (Anthropogenic Glass)

Sandstone (likely Fossilized Wood or Concrete Simulacrum)

Arenite / Silicified Wood / Anthropogenic Concrete

Possible industrial slag or basaltic volcanic glass

Likely iron-rich vitreous slag; natural alternative: basaltic glass (tachylite)

Concrete / Anthropogenic Conglomerate

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

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

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

Tiffany Stone

Bertrandite Fluorite (CaF2 + Be4Si2O7(OH)2)

Blue Slag Glass

Amorphous Silica (Byproduct of smelting)

Cullet Glass / Slag Glass

Amorphous silica glass

Concrete-like aggregate surface with embedded rock fragments

Anthropogenic concrete or exposed aggregate; not a natural rock specimen

Slag Glass

Amorphous Silicate (Man-made)

Chert (Arrowhead Shard)

Microcrystalline silica (SiO2)

Nutting Stone / Cupstone (Sandstone or Quartzite)

Sedimentary rock with anthropogenic modification (cupule)

Asphalt Concrete

Bituminous Concrete (Anthropic Rock)

Slag Glass (Cullet)

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

Aqua Aura Quartz

Silicon Dioxide (SiO2) bonded with Gold (Au)

Concrete

Anthropogenic Sedimentary Conglomerate (Cement mixture: typically Ca2SiO4, Ca3SiO5, Ca3Al2O6)

Synthetic Costume Accessory (Non-Geological)

Polyester and Acrylic Fiber (Anthropogenic polymer)

Likely industrial slag or weathered basalt

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

Ferrosilicon Slag (Industrial Vitrified Glass)

Vitreous Silicate Residue

Blue Slag Glass

Ferro-silicate glass (Slag)

Slag Glass

Glassy Silicate Residue

Copper slag or vesicular basalt with copper minerals

Industrial slag / Basaltic matrix with secondary copper minerals

Chert (Arrowhead Artifact)

Microcrystalline Quartz (SiO2)

Chert Arrowhead (Lithic Tool)

Microcrystalline quartz (SiO2) - Archeological lithic artifact

Likely weathered metallic mineral or slag fragment

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

Possible obsidian or slag glass

Volcanic glass, primarily SiO₂; alternatively industrial iron-rich glassy slag