Industrial Byproduct (Anthropogenic Rock Like Material)

Asphalt concrete

Anthropogenic conglomerate

Red Slag Glass

Amorphous Silica (Industrial byproduct with metallic oxide dopants)

Basalt or Slag

Extrusive Igneous Rock / Industrial Slag

Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)

Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)

Green Obsidian Slag Glass

Silicon Dioxide (Amorphous Glass)

Slag

Metallurgical Slag

Cullet Glass (Slag)

Amorphous Silicon Dioxide (Man-made)

Green sea glass or green glass-like tumbled material

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

Green sea glass (likely)

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

Asphalt Conglomerate

Artificial Bituminous Conglomerate

Asphalt (Bituminous pavement)

Bituminous concrete / Asphalt

Slag (Industrial Glass/Metal Waste)

Artificial silicate/ferro-silicate byproduct

Cobalt Glass Slug (Man-made Glass)

Amorphous Silica with Cobalt Oxide (SiO2 + CoO)

Ferrochrome Slag

Industrial Glassy Slag (Fe-Cr alloy byproduct)

Aggregate Concrete

Anthropogenic Conglomerate (Technosol)

Metal Chain (Likely Steel or a Steel Alloy)

Steel (primarily iron and carbon); specific alloy unknown

Painted River Rock

Artificially Coated Sedimentary Rock

Blue Glass or Slag Glass

Amorphous Silica (Anthropogenic Glass)

Cobalt Glass Slug (Cullet)

Man-made Silicate Glass with Cobalt Oxide (CoO)

Iron Slag

Iron Slag (Industrial Vitreous Material)

Slag Glass

SiO2 (Silicon Dioxide) with impurities

Sandstone (likely Fossilized Wood or Concrete Simulacrum)

Arenite / Silicified Wood / Anthropogenic Concrete

Red Slag Glass (Cullet)

Amorphous Silicon Dioxide (SiO2) with metallic dopants

Likely weathered iron-rich rock or slag fragment

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

Asphalt (Bituminous Concrete)

Composite material (bitumen binder with mineral aggregate)

Blue Slag Glass

Amorphous Silica (Byproduct of smelting)

Possible industrial slag or basaltic volcanic glass

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

Concrete-like aggregate surface with embedded rock fragments

Anthropogenic concrete or exposed aggregate; not a natural rock specimen

Cullet Glass / Slag Glass

Amorphous silica glass

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)

Nutting Stone / Cupstone (Sandstone or Quartzite)

Sedimentary rock with anthropogenic modification (cupule)

Chert (Arrowhead Shard)

Microcrystalline silica (SiO2)

Slag Glass

Amorphous Silicate (Man-made)

Synthetic Costume Accessory (Non-Geological)

Polyester and Acrylic Fiber (Anthropogenic polymer)

Concrete

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

Slag Glass (Cullet)

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

Aqua Aura Quartz

Silicon Dioxide (SiO2) bonded with Gold (Au)

Asphalt Concrete

Bituminous Concrete (Anthropic Rock)

Ferrosilicon Slag (Industrial Vitrified Glass)

Vitreous Silicate Residue

Likely industrial slag or weathered basalt

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