Glass

Cullet Glass (Industrial Slag Glass)

Amorphous Silica (SiO2) with metallic oxide impurities

Blue Obsidian (Cullet Glass)

Silicon Dioxide (Amorphous Glass)

Blue Obsidian (Cullet Glass)

Man-made silicate glass

Opalite

Synthetic glass / Opalized glass

Opalite

Synthetic glass / Opaque silicious glass

Green glassy slag or manufactured glass bead

Noncrystalline silicate glass; likely industrial glass/slag, not a true mineral

Green Slag Glass

Cullet (Amorphous Silicon Dioxide with impurities)

Likely clear quartz fragment

Quartz (SiO₂)

Cullet Glass (Slag)

Amorphous Silicon Dioxide (Man-made)

Opalite

Man-made Opalized Glass (Synthetic Glass)

Blue tumbled glass-like specimen; likely blue slag glass

Likely man-made glass (silicate glass), not a natural mineral; exact material cannot be confirmed from the image

Blue Goldstone

Man-made glass infused with copper crystals

Blue sea glass or blue glassy mineral fragment

Uncertain; likely man-made soda-lime glass, not a natural mineral

Chipped Glass/Plastic Fragment

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

Sea glass (likely green bottle glass)

Human-made soda-lime silicate glass; not a natural mineral or geological rock

Sea glass (likely pale blue glass)

Human-made silicate glass, likely soda-lime glass; not a natural mineral or rock

Opalite

Synthetic Opalite Glass / Opalized Glass

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (SiO2) with metallic oxide impurities

Sea Glass (Frosted Glass)

Amorphous Silica (SiO2) with various additives

Mica flakes (Muscovite)

Muscovite mica (KAl2(AlSi3O10)(F,OH)2)

Goldstone (Red)

Aventurine Glass (Cupriferous glass)

Tumbled blue glass-like specimen, possibly dyed chalcedony or synthetic glass

Uncertain; possible dyed quartz/chalcedony (SiO₂), but appearance strongly suggests cobalt-blue glass

Colorless faceted gemstone, likely glass or quartz

Uncertain; possibly quartz (SiO₂), but the strong uniform brilliance and apparent molded/faceted form may indicate leaded glass or cubic zirconia

Green sea glass or green glass-like tumbled material

Amorphous silicate glass; likely anthropogenic soda-lime glass, not a natural mineral

Slag Glass

SiO2 (Silicon Dioxide) with impurities

Opalite

Synthetic glass / Opalized glass

Sea Glass (Frosted Quartz/Glass)

Amorphous Silicon Dioxide (SiO2)

Cobalt Glass Slug (Cullet)

Man-made Silicate Glass with Cobalt Oxide (CoO)

Muscovite

Muscovite mica, KAl2(AlSi3O10)(OH)2

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Goldstone (brown goldstone)

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

Goldstone (aventurine glass)

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

Glass

Amorphous Silicon Dioxide (SiO2)

Black obsidian (likely)

Volcanic glass; predominantly silica-rich, non-crystalline silicate glass

Goldstone (likely red/brown aventurine glass)

Man-made aventurine glass; copper-bearing silicate glass (not a natural mineral)

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial Byproduct)

Polished opalite (likely man-made opalescent glass)

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

Likely blue glass or synthetic gemstone jewelry

Uncertain; possibly synthetic spinel, cubic zirconia, or blue glass

Muscovite

Muscovite mica, KAl2(AlSi3O10)(OH)2

Obsidian

Volcanic Glass

Green Glass Cullet / Recycled Glass

Amorphous Silicon Dioxide (SiO2) with various metal oxides

Goldstone (Brown)

Aventurine glass