Anthropogenic (Industrial Byproduct)

Green Slag Glass

Cullet (Amorphous Silicon Dioxide with impurities)

Slag (Industrial Glass/Metal Waste)

Artificial silicate/ferro-silicate byproduct

Iron meteorite fragment (likely metallic meteorite)

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

Red Slag Glass

Amorphous Silica (Industrial byproduct with metallic oxide dopants)

Slag Glass (Cullet)

Amorphous Silica / Glass residue

Silicon Carbide

Silicon Carbide (Moissanite / Carborundum), SiC

Asphalt (Bituminous Pavement Bit)

Bitumen-bound aggregate (Petrochemical-bound composite)

Slag (Industrial Glass/Metal)

Ferrous slag or Glassy silicate byproduct

Cullet Glass / Slag Glass

Amorphous silica glass

Slag (Industrial Glass Slag)

Amorphous Silicate Glass (often containing Al, Ca, Mg, and Ti oxides)

Asphalt Concrete

Bituminous Concrete / Asphaltic Composite

Green Slag Glass

Amorphous Silica / Glassy Blast Furnace Slag

Possible flint or slag fragment

Microcrystalline quartz (chalcedony), or iron-rich industrial slag

Cullet Glass (sometimes mistaken for Blue Obsidian or Slag)

Amorphous Silicon Dioxide (SiO2) with chemical additives (e.g., Cobalt for blue color)

Chert (Arrowhead Shard)

Microcrystalline silica (SiO2)

Likely weathered metallic mineral or slag fragment

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

Possible iron meteorite

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

Red Slag Glass (Cullet)

Amorphous Silicon Dioxide (SiO2) with metallic dopants

Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)

Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)

Copper slag or vesicular basalt with copper minerals

Industrial slag / Basaltic matrix with secondary copper minerals

Likely slag or metallic industrial byproduct

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

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

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

Slag Glass

Glassy Silicate Residue

Orange Calcite

Calcium Carbonate (CaCO3)

Anthracite Coal with Sulfur staining

Anthracite (Carbon C with impurities)

Possible obsidian or slag glass

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

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert (Arrowhead Debitage or Spall)

Silicon Dioxide (SiO₂)

Asphalt Conglomerate

Artificial Bituminous Conglomerate

Jasper (Multi-colored) / Sea Glass Slag

Silicon Dioxide (SiO2) with impurities of Iron Oxide

Eroded Brick or Pumice-like Scoria

Vesicular Basalt / Scoria (Anthropogenic variant: Eroded Firebrick)

Bituminous Coal

Coal (Organically derived sedimentary rock)

Possible tektite or volcanic glass specimen

Natural silica glass; composition commonly near SiO₂, but exact identification requires chemical testing

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

Probable fine-grained basalt; exact identification requires testing

Likely industrial slag or weathered basalt

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

Asphalt (Bituminous Concrete)

Composite material (bitumen binder with mineral aggregate)

Painted River Pebble (likely Basalt or Greywacke)

Aphanitic Lithic Clast with Anthropogenic Pigment coating

Iron-rich slag or weathered ironstone fragments

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

Green sea glass (likely)

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

Asphalt (Aggregate)

Bituminous macadam / Concrete Aggregate

Quartz (Engineered Quartz Surface)

Silicon Dioxide (SiO2) based composite

Possible industrial slag or basaltic volcanic glass

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