Anthropogenic Material (Man Made Sedimentary Mimic)

Concrete-like aggregate surface with embedded rock fragments

Anthropogenic concrete or exposed aggregate; not a natural rock specimen

Asphalt Concrete (Bituminous Concrete)

Bituminous aggregate

Opalite

Synthetic Opalised Glass

Blue crystal pendant (likely blue glass or synthetic crystal)

Not identifiable from the image; possibly synthetic quartz or glass, rather than a natural mineral

Ring with an Orange Inlay

N/A (Man-made object)

Not a geological specimen

N/A (man-made object)

Cullet Glass (sometimes mistaken for Blue Obsidian or Slag)

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

Chert (Arrowhead Fragment)

Microcrystalline Quartz (SiO2)

Asphalt (Bituminous Pavement)

Bituminous mix (Aggregates with Bitumen binder)

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (SiO2) with metallic oxide impurities

Industrial Slag

Anthropogenic Vitreous Slag

Conglomerate

Conglomerate (Sedimentary rock containing rounded clasts)

Crushed Stone (Likely Limestone or Granite)

Calcium Carbonate (CaCO3) for Limestone / Quartz and Feldspar for Granite

Opalite

Man-made opalescent glass

Diamond

Native Carbon (C)

Asphalt (Bituminous Concrete)

Bituminous Concrete / Pavement

Small pebble, likely limestone

Unidentified carbonate pebble, possibly micritic limestone (calcite, CaCO₃)

Chert Arrowhead

Cryptocrystalline Quartz (SiO2)

Fordite

Anthropogenic paint-rock

Sandstone (with concrete/human-made layer)

Clastic Sedimentary Rock (primarily Quartz/Feldspar grains)

Tumbled gray stone, likely quartz-rich pebble

Probable microcrystalline quartz/chalcedony (SiO₂), possibly gray jasper or quartzite

Cardstock (Paper)

Cellulose (C6H10O5)n

Blue Goldstone

Auraventurine (Synthetic glass with cobalt and copper inclusions)

Quartz pebble (Quartztite fragment)

Silicon Dioxide (SiO2)

Iron Slag

Iron/Steel Slag (Ferrosilicate Glass)

Blue-green faceted gemstone, possibly glass or synthetic material

Not identifiable from the image; possible synthetic spinel or glass

Slag Glass / Industrial Slag

Anthropogenic Glass

Man-made Carved Stone (Scream Mask/Skull motif)

Carved Soapstone or Serpentine-rich rock

ABS Plastic (Acrylonitrile Butadiene Styrene)

(C8H8)x·(C4H6)y·(C3H3N)z

Opalite

Synthetic Opalized Glass

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial Man-made)

Opalite (Man-made Glass)

Fused glass (typically made of dolomite and metal opacifiers)

Beads (likely glass or man-made material)

N/A (artificial material)

Cobalt Blue Glass / Cullet Glass

Silicon dioxide (Amorphous man-made glass)

Opalite

Man-made Glass (SiO2 + additives)

Tumbled black stone, likely black obsidian

Obsidian (volcanic glass; chiefly silica-rich rhyolitic composition)

Clear quartz fragment (rock crystal)

Quartz, silicon dioxide (SiO₂)

Opalite

Opalescent Glass (SiO2 + coloring agents)

White pebble, likely quartz or calcite

Indeterminate from image; possible microcrystalline quartz (SiO₂) or calcite (CaCO₃)

Slag

Anthropogenic Vitrification Product / Silicate Slag

Polished brown jasper (likely brecciated or orbicular jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and other mineral inclusions

Blue Goldstone

Synthetic glass with cobalt and copper inclusions