Mineral Based Alloy (Anthropogenic)

South Korean 100 Won Coin (Cupronickel)

Cupronickel Alloy (75% Cu, 25% Ni)

Stainless Steel (Polished)

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

Asphalt Concrete

Bituminous Concrete / Asphaltic Composite

Asphalt Concrete (Bituminous Conglomerate)

Anthropogenic Bituminous Conglomerate

Cupronickel (on a 1981 Mexico 20 Pesos coin)

Copper-Nickel Alloy (Cu75Ni25)

Concrete rubble

Anthropogenic conglomerate

Industrial Slag

Anthropogenic Vitreous Slag

Ferrochrome Slag

Anthropogenic slag (Fe-Cr alloy waste)

Concrete / Conglomerate (Man-made)

Artificial Conglomerate (Cementitious Composite)

Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)

Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)

Metal Chain (Likely Steel or a Steel Alloy)

Steel (primarily iron and carbon); specific alloy unknown

Concrete fragment with Aggregate

Anthropogenic Concrete with Calcarious and Siliceous Aggregate

Man-made Slag (Industrial Byproduct)

Anthropogenic Glassy Residue

Metal Alloy (Likely Pewter or Sterling Silver)

Not a natural geological specimen; composed of refined metals. If pewter, it's a tin-based alloy. If sterling silver, it's 92.5% silver and 7.5% other metals (usually copper).

Conglomerate (Asphaltic/Anthropogenic)

Clastic sedimentary rock / Bituminous mixture

Slag

Anthropogenic glassy silicate

Slag (Industrial)

N/A (Anthropogenic Slag)

Chert Arrowhead

Cryptocrystalline Quartz (SiO2)

Lepidolite in Quartz Matrix

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Asphalt (Road Aggregate)

Bituminous Conglomerate / Asphalt Concrete

Native Silver

Silver (Ag)

Synthetic Zinc/Polycarbonate Composite (Bey-specimen)

Zinc Alloy (Zamak 3) with Polycarbonate (C15H16O2)n Overlay

Metal Alloy (Jewelry)

Not a naturally occurring rock or mineral; likely a metal alloy for jewelry. Possible compositions include sterling silver (92.5% silver, 7.5% copper), or other silver/gold alloys.

Chert Arrowhead

Microcrystalline Quartz (SiO2)

Terrazzo (Synthetic Composite Rock)

Cementitious or Epoxy Resin-bound Aggregates

Iron Slag (Industrial Byproduct)

Anthropogenic Vitrification Product/Ferrous Slag

Concrete

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

Slag (Industrial Glass/Glassy Rock)

Anthropogenic Vitreous Material

Gold (10K Alloy)

Aurum (Au) with alloying metals (Cu, Ag, Zn)

Chert Arrowhead

Microcrystalline Quartz (SiO2)

Mystic Topaz

Aluminum silicate fluoride hydroxide with titanium coating (Al2SiO4(F,OH)2)

Beryl (Aquamarine variety)

Beryllium Aluminum Cyclosilicate (Be3Al2Si6O18)

Slag Glass

Anthropogenic Amorphous Silicon Dioxide

Man-made Metal Pin (Non-geological)

Antimony-Lead Alloy or Zinc/Brass Base with Electroplating

Slag (Industrial Glass Slag)

Amorphous Silica / Ferro-silicate Slag

Concrete / Anthropogenic Conglomerate

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

Titanium Aura Quartz (Bismuth-coated Druzy)

Silicon Dioxide (SiO2) with Titanium/Metal vapor coating

Concrete

Anthropogenic Conglomerate

Molybdenite in Quartz

Molybdenite (MoS2) with Quartz (SiO2)

Titanium-coated Metal Cube (Man-made Fidget Toy)

Titanium-anodized or electroplated alloy (e.g., Ti-coated Zinc or Aluminum)

N/A - Man-made object (Jewelry Chain)

Antiqued or Oxidized Metal Chain (often Steel or Brass)

Painted River Rock

Anthropogenic-modified Siliciclastic Sedimentary Rock