Man Made Glass (Not A Natural Rock Or Mineral)

Green Glass Cullet / Recycled Glass

Amorphous Silicon Dioxide (SiO2) with various metal oxides

Goldstone (aventurine glass)

Synthetic copper-bearing soda-lime glass; commonly sold as red goldstone

Green glass-like cabochon, likely synthetic glass or resin

Unidentified green transparent material; possibly molded glass, synthetic spinel, or resin

Goldstone and pink quartz bead strands

Goldstone is aventurescent copper-bearing glass; pink beads are likely rose quartz (SiO₂), though dyed or glass imitations are possible

Green glass sphere/marble

Soda-lime glass (primarily SiO2, Na2O, CaO)

Opalite

Synthetic glass / Opalized glass

Opalite (a synthetic glass)

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

Blue glassy fragment among beach gravel

Likely cobalt-blue man-made glass; not a natural mineral specimen

Green sea glass (likely bottle glass)

Man-made soda-lime silicate glass; not a natural mineral

Unidentified gray rock fragment

Indeterminate from image; possibly quartz- or feldspar-rich silicate material

Opalite (Man-made Glass)

Synthetic Opalised Glass

Opalite

Man-made Glass (Synthetic Opalized Glass)

Opalite (likely man-made glass)

Opalite; amorphous silica glass, not a natural mineral

Man-made Synthetic Material (Plastic/Composite)

Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)

Blue Goldstone

Man-made glass with cobalt and metal flecks

Green sea glass (likely slag glass or bottle glass)

Man-made soda-lime silicate glass; not a naturally occurring mineral

Opalite

Synthetic Opalite Glass / Opalized Glass

Man-made Metal Pin (Non-geological)

Antimony-Lead Alloy or Zinc/Brass Base with Electroplating

Opalite (Man-made Glass)

Fused glass (typically made of dolomite and metal opacifiers)

Not a rock, mineral, or geological specimen

Opalite

Synthetic glass / Opalized glass

Opalite

Man-made opalized glass

N/A - Non-Geological Item

Opalite

Synthetic Opalite (Man-made glass)

Chipped Glass/Plastic Fragment

Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic

Green Obsidian Sphere (man-made glass)

Vitreous Silica with Chromium/Iron additives

Opalite

Synthetic glass (SiO2 + impurities)

Tumbled milky quartz

Quartz (SiO₂), cryptocrystalline-to-massive variety

Goldstone (brown goldstone)

Man-made aventurine glass, typically copper-bearing silica glass

Dragon's Breath (Mexican Opal Glass)

Artisan Foil Glass (SiO2 based)

Black Obsidian

Amorphous volcanic glass (SiO2 + impurities)

Opalite

Synthetic glass / Opaque silicious glass

Asphalt Concrete (Bituminous Conglomerate)

Anthropogenic Bituminous Conglomerate

ABS Plastic (Acrylonitrile Butadiene Styrene)

(C8H8)x·(C4H6)y·(C3H3N)z

Cullet Glass / Slag Glass

Amorphous silica glass

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (SiO2) with metallic oxide impurities

Opalite (Man-made Glass)

Synthetic Silicon Dioxide Glass (SiO2 + metal oxides)

Blue Obsidian (Cullet Glass)

Silicon Dioxide (Amorphous Glass)

Asphalt Concrete

Bituminous conglomerate

Opalite

Man-made opalescent glass

Opalite

Synthetic Opalized Glass

Opalite

Synthetic Opalite Glass