Synthetic 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)

Cullet Glass (Slag)

Amorphous Silicon Dioxide (Man-made)

Blue sea glass or blue glassy mineral fragment

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

Sea Glass (Frosted Glass)

Amorphous Silica (SiO2) with various additives

Slag Glass

SiO2 (Silicon Dioxide) with impurities

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (SiO2) with metallic oxide impurities

Green sea glass or green glass-like tumbled material

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

Sea Glass (Frosted Quartz/Glass)

Amorphous Silicon Dioxide (SiO2)

Goldstone (brown goldstone)

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

Cobalt Glass Slug (Cullet)

Man-made Silicate Glass with Cobalt Oxide (CoO)

Sea Glass (Frosted Glass Fragment)

Amorphous Silica (Anthropogenic Sediment)

Glass

Amorphous Silicon Dioxide (SiO2)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial Byproduct)

Green Glass Cullet / Recycled Glass

Amorphous Silicon Dioxide (SiO2) with various metal oxides

Green Sea Glass

Man-made vitreous material (silica glass)

Goldstone (likely red/brown aventurine glass)

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

Green sea glass (likely bottle glass)

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

Black obsidian (likely)

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

Green sea glass (likely slag glass or bottle glass)

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

Libyan Desert Glass

Libyan Desert Glass (Impactite)

Cullet Glass / Slag Glass

Amorphous silica glass

Green sea glass or tumbled green quartz (uncertain)

Likely quartz (SiO₂) if natural; alternatively man-made soda-lime glass

Uncertain blue-white mineral fragment

Possibly calcite or quartz; identification is limited because the specimen is tiny and partly translucent

Snowflake Obsidian

Spherulitic Obsidian (Amorphous volcanic glass with Phenocrysts of Cristobalite)

Slag Glass (Cullet)

Amorphous Silicon Dioxide (SiO2) with metal oxide colorants

Cullet (Slag Glass)

Amorphous Silica (SiO2) with various metal oxide colorants

Dragon's Breath (Mexican Opal Glass)

Artisan Foil Glass (SiO2 based)

Sea Glass (Cobalt Blue)

Amorphous Silica (Glass with Cobalt additives)

Obsidian

Volcanic glass

Obsidian

Volcanic glass (Mainly SiO2)

Tumbled green glassy mineral, possibly aventurine or fluorite

Uncertain; likely quartz variety (aventurine quartz, SiO₂) or green fluorite (CaF₂)

Blue Slag Glass

Amorphous Silica (Industrial byproduct)

Blue goldstone beads

Man-made aventurine glass (silica glass with metallic copper inclusions), not natural lapis lazuli

Snowflake Obsidian

Volcanic glass with Phenocrysts (SiO2 with Cristobalite inclusions)

Snowflake Obsidian

Volcanic Glass with Cristobalite inclusions (SiO2)

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

Muscovite Mica

KAl2(AlSi3O10)(OH)2

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Muscovite Mica (Golden/Yellow variety)

KAl2(AlSi3O10)(F,OH)2

Green sea glass (likely bottle glass)

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