Man Made Material (Simulated Mineral)

Slag (Industrial Byproduct)

Artificial silicate/iron byproduct

Asphalt Concrete

Bituminous Concrete

Concrete

Anthropogenic Conglomerate

Tumbled black stone, likely black obsidian

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

Asphalt Concrete

Bituminous Concrete (Anthropic Rock)

Opalite-style glass pendant

Man-made opalescent glass (not natural opal)

Blue Slag Glass

Man-made Silicon Dioxide (Amorphous)

Cobalt Blue Glass / Cullet Glass

Silicon dioxide (Amorphous man-made glass)

Asphalt / Road Aggregate

Bituminous Conglomerate (synthetic)

Ring with an Orange Inlay

N/A (Man-made object)

White pebble, likely quartz or calcite

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

Sea Glass

Amorphous Silicon Dioxide (SiO2)

One Pound Coin (UK)

Nickel-Brass Alloy (Cu-Zn-Ni)

Amber-set ring

Amber (fossilized plant resin; organic mineraloid), set in a metal ring

Exposed Aggregate Concrete (Pea Gravel)

Concrete with Siliceous Alluvial Gravels

Small black stone fragment (possibly obsidian)

Unidentified dark rock; obsidian is volcanic glass (composition typically rhyolitic)

Beads (likely glass or man-made material)

N/A (artificial material)

Polymer Clay (Mock Mineral)

Polyvinyl chloride (PVC) with plasticizers and pigment

Likely tumbled red mineral or glass imitation

Indeterminate; possibilities include red jasper (microcrystalline quartz, SiO₂) or dyed chalcedony

Crackled Quartz (Dyed)

Silicon Dioxide (SiO2)

Opalite

Synthesized glass / Silicon dioxide glass

Sea Glass

Man-made vitreous material (silica-based glass)

Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)

Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)

Blue opalite glass cabochon (likely imitation opal)

Man-made opalescent glass; not a natural mineral

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (SiO2) with metallic oxide impurities

Costume Jewelry with Synthetic Gemstones

Synthetic Cubic Zirconia and Glass (SiO2 / ZrO2)

Asphalt (Bituminous Concrete)

Bituminous mix containing aggregates and petroleum-based binder (CnH2n+2)

Opalite

Synthetic Glass (Hydrated Silica Simulant)

Ocean Jasper Mushroom

Orbicular Jasper (Silicon Dioxide, SiO2 mixed with various impurities)

Opalite glass sphere (likely synthetic imitation)

Man-made opalescent glass; not natural opal

Opalite

Synthetic Opalized Glass

Blue Goldstone

Man-made glass with crystalline copper/cobalt inclusions

Likely iron-rich slag or weathered ironstone fragment

Uncertain; possibly iron oxide–rich material (hematite/goethite) or industrial iron slag

Concrete

Hydrated Portland Cement Aggregate Composite

Concrete Rubble with Aggregate

Hardened Portland Cement Paste with Coarse Aggregate

Polished blue glassy mineral specimen, likely sodalite or blue aventurine

Most consistent with sodalite (Na₈Al₆Si₆O₂₄Cl₂), though dyed quartzite or blue glass cannot be excluded from the photograph

Concrete Fragment

Hardened Portland Cement Composite

Chert Arrowhead (Projectile Point)

Microcrystalline Quartz (Chert or Flint)

Aggregate Concrete

Anthropogenic Conglomerate (Technosol)

Asphalt Concrete (Bituminous Concrete)

Bituminous aggregate

Opalite

Opalescent Glass (SiO2 + coloring agents)

Tumbled milky quartz

Quartz (SiO₂), cryptocrystalline-to-massive variety