Man Made Mineral Simulant (Glass)

Turquoise-colored bead necklace (likely dyed howlite or magnesite)

Likely dyed Ca₂B₅SiO₉(OH)₅ (howlite) or MgCO₃ (magnesite); turquoise is CuAl₆(PO₄)₄(OH)₈·4H₂O

Milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

Opalite

Synthetic Glass (typically Silica/Magnesium based with metal additives)

Tumbled milky quartz

Quartz — silicon dioxide (SiO₂), cryptocrystalline or microcrystalline variety possible

Sea Glass

Man-made vitreous material

Slag Glass

Amorphous Silicate (Man-made)

Quartz crystal fragment (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Dragon's Breath (Mexican Opal Glass)

Artisan Foil Glass (SiO2 based)

Not a geological specimen

N/A (man-made object)

Sea Glass

Man-made vitreous material / Silicon dioxide

Blue Goldstone

Aventurine Glass

Metal Chain Belt with Square Plates

Not applicable (man-made)

Cullet Glass (Slag)

Amorphous Silicon Dioxide (Man-made)

Opalite-style glass pendant

Man-made opalescent glass (not natural opal)

Tumbled milky quartz

Quartz (SiO₂), cryptocrystalline-to-massive variety

Faceted colorless gemstone, likely quartz or glass imitation

Most likely quartz (SiO₂), though the strong glare and visible facet pattern could indicate cubic zirconia or lead glass

Blue Goldstone

Man-made glass with crystalline copper/cobalt inclusions

Polished opalite (likely man-made opalescent glass)

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

Clear Quartz Sphere (Rock Crystal)

Silicon Dioxide (SiO2)

Green Quartz / Chrysoprase / Sea Glass

Silicon Dioxide (SiO2)

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂), opaque-to-translucent milky variety

Opalite

Synthetic Glass (Simulated Opal)

Sea Glass

Amorphous silicon dioxide (man-made glass weathered by nature)

Blue opalite glass cabochon (likely imitation opal)

Man-made opalescent glass; not a natural mineral

Goldstone

Man-made glass infused with copper particles

Milky quartz

Quartz (silicon dioxide, SiO₂)

Blue Goldstone

Man-made glass with cobalt and metal flecks

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial Byproduct)

Blue Slag Glass

Anthropogenic Amorphous Silicon Dioxide

Goldstone

Man-made glass with copper inclusions

Sea Glass

Man-made vitreous material (silica-based glass)

Cullet (Slag Glass)

Amorphous Silica (SiO2) with various metal oxide colorants

Opalite

Man-made glass (traditionally simulated Opal)

Likely tumbled red mineral or glass imitation

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

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

Opalite glass sphere (likely synthetic imitation)

Man-made opalescent glass; not natural opal

Tumbled milky quartz

Quartz, silicon dioxide (SiO₂)

Clear quartz fragment

Quartz (silicon dioxide, SiO₂)

Goldstone

Man-made glass infused with copper crystals

Costume Jewelry with Synthetic Gemstones

Synthetic Cubic Zirconia and Glass (SiO2 / ZrO2)

Milky quartz (likely rough quartz crystal)

Quartz, silicon dioxide (SiO₂)

Opalite

Synthetic Opalite Glass