Industrial Byproduct (Anthropogenic Material)

Iron-rich slag or weathered ironstone fragments

Probably hematite–goethite material; possibly industrial iron slag (Fe₂O₃/FeO(OH))

Asphalt (Bituminous Concrete)

Bituminous mix / Anthropogenic conglomerate

Terrazzo (Synthetic Composite Rock)

Cementitious or Epoxy Resin-bound Aggregates

Tiffany Stone

Bertrandite Fluorite (CaF2 + Be4Si2O7(OH)2)

Possible industrial slag or basaltic volcanic glass

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

Possible tektite or iron-rich slag-like natural specimen

Uncertain; possibly natural glass (tektite) or magnetite-rich rock

Slag Glass

SiO2 (Silicon Dioxide) with impurities

Fordite

Anthropogenic paint-rock

Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)

Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)

Likely weathered iron-rich rock or slag fragment

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

Blue Glass or Slag Glass

Amorphous Silica (Anthropogenic Glass)

Cobalt Glass Slug (Cullet)

Man-made Silicate Glass with Cobalt Oxide (CoO)

Stainless Steel (Polished)

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

Synthetic Costume Accessory (Non-Geological)

Polyester and Acrylic Fiber (Anthropogenic polymer)

Basalt or Slag

Extrusive Igneous Rock / Industrial Slag

Sea Glass

Man-made vitreous material (silica-based glass)

Blue Slag Glass

Amorphous Silica (Byproduct of smelting)

Possible iron meteorite

Metallic meteorite, likely Fe–Ni alloy (kamacite/taenite)

Concrete

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

Aqua Aura Quartz

Silicon Dioxide (SiO2) bonded with Gold (Au)

Silicon Carbide (Carborundum)

Silicon Carbide (SiC)

Slag Glass

Amorphous Silicate (Man-made)

Slag Glass (Cullet)

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

Artisanal Glass Beads (Simulated Goldstone or Aventurine Glass)

Silicon Dioxide (SiO2) with metallic inclusions

Lava Rock with Fabric Impression

Scoria or Basalt with anthropogenic impressions

Slag Glass

Glassy Silicate Residue

Slag Glass

Amorphous Silica Glass (with metal oxide inclusions)

Concrete / Anthropogenic Conglomerate

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

Chert (Arrowhead)

Chert (SiO2)

Concrete fragment with Aggregate

Anthropogenic Concrete with Calcarious and Siliceous Aggregate

Blue Slag Glass

Ferro-silicate glass (Slag)

Carborundum (Silicon Carbide)

Silicon Carbide (SiC)

Ferrosilicon Slag (Industrial Vitrified Glass)

Vitreous Silicate Residue

Cullet Glass (Strawberry Glass)

Amorphous Silicon Dioxide (SiO2) with metallic dopants

Likely weathered metallic mineral or slag fragment

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

Asphalt Concrete

Bituminous Concrete (Anthropic Rock)

Anthracite Coal with Sulfur staining

Anthracite (Carbon C with impurities)

Iron meteorite fragment (likely metallic meteorite)

Fe–Ni kamacite/taenite alloy; exact identification requires testing

Slag Glass (Cullet)

Amorphous Silica / Glass residue

Chert (Arrowhead/Projectile Point)

Microcrystalline quartz (SiO2)

Copper slag or vesicular basalt with copper minerals

Industrial slag / Basaltic matrix with secondary copper minerals

Asphalt (Bituminous pavement)

Bituminous concrete / Asphalt