Man Made Material (Anthro Lithic Product)

Opalite glass sphere (likely synthetic imitation)

Man-made opalescent glass; not natural opal

Opalite

Synthetic glass / Opalized glass

Conglomerate

Conglomerate (clastic sedimentary rock)

Concrete rubble

Anthropogenic conglomerate

Cullet (Slag Glass)

Amorphous Silica (SiO2) with various metal oxide colorants

Opalite

Synthetic glass / Opaque silicious glass

Likely iron-rich rock or weathered metallic mineral fragment

Uncertain; possibly limonite/goethite or iron-bearing slag

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

Porcelain (White Ceramic)

Mullite-bearing Vitrified Ceramic (Major phases: Mullite Al6Si2O13, Glassy Silica SiO2)

Tumbled milky quartz

Quartz (SiO₂), cryptocrystalline-to-massive variety

Blue opalite glass cabochon (likely imitation opal)

Man-made opalescent glass; not a natural mineral

Mohave Turquoise (Composite/Stabilized)

Hydrated copper aluminium phosphate (CuAl6(PO4)4(OH)8·4H2O) with stabilizing resin and metallic inclusions

Asphalt Concrete (Bituminous Concrete)

Bituminous aggregate

Opalite (Synthetic Moonstone/Sea Opal)

Silicon Dioxide (SiO2) glass with metallic inclusions

Opalite

Synthetic glass (SiO2 + impurities)

Asphalt (Bituminous pavement)

Bituminous concrete / Asphalt

Diamond

Native Carbon (C)

Aura Quartz (Rainbow Quartz)

Silicon Dioxide (SiO2) with metallic vapor coatings

Quartz (Engineered Stone Countertop)

Silicon Dioxide (SiO2) with polymer resins

Carborundum (Silicon Carbide)

Silicon Carbide (SiC)

Blue cabochon gemstone, likely synthetic glass or dyed stone

Indeterminate from image; possible glass, synthetic spinel, sodalite, or lapis lazuli

Blue glassy gemstone-like specimen

Indeterminate; possibly dyed or treated turquoise, blue apatite, or man-made glass

Red Sandstone or Brick Fragment

Arenite (if sandstone)

Asphalt Chunk (with aggregate)

Bituminous concrete / Anthropogenic conglomerate

Goldstone

Avventurina (Man-made Glass with Copper inclusions)

Chert

Microcrystalline Quartz (SiO2)

Polished black pebble, likely basalt

Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar and pyroxene, commonly with olivine

Banded Chert

Microcrystalline Quartz (SiO2)

Opalite (a synthetic glass)

Silicon Dioxide (SiO2) with various additives; not a true mineral but a man-made gem simulant

Not a rock, mineral, or geological specimen

Transit Token (RTD Denver)

Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)

Dragon Vein Agate (Dyed/Treated)

Agate (SiO2)

Blue Goldstone

Aventurine Glass

Conglomerate

Conglomerate (Sedimentary rock containing rounded clasts)

Polished opalite (likely man-made opalescent glass)

Opalite is a commercial name, not a mineral; typically opalescent glass, often soda-lime silicate glass

Glass

Amorphous Silicon Dioxide (SiO2)

Opalite

Man-made opalescent glass

Slag Glass

Amorphous Silicate (Man-made)

Green iridescent glass cabochon or synthetic gemstone

Likely synthetic glass; possibly coated synthetic quartz or lab-created green gemstone

Sea Glass

Man-made silicate glass

Red glassy gemstone, possibly garnet

Unidentified red transparent material; garnet group (X₃Y₂(SiO₄)₃) is a possibility

Synthetic Resin / Plastic Figurine

Synthetic Polymer (Copolymer of Polyethylene or Resin)