Man Made Glass

Opalite

Synthetic glass / Opalized glass

Blue goldstone (man-made glass)

Copper-bearing aventurine glass; synthetic silicate glass

Opalite (likely man-made glass)

Opalite; amorphous silica glass, not a natural mineral

Opalite (likely man-made glass)

Opalite is a trade name for opalescent glass, not a natural mineral; composition is typically silica glass with additives

Sea Glass

Amorphous Silicon Dioxide (SiO2)

Opalite

Synthetic glass / Opalized glass

Tumbled opalite (likely man-made glass)

Opalite glass; a synthetic opalescent glass, not a natural mineral species

Opalite

Synthetic glass / Opaque silicious glass

Likely tumbled red mineral or glass imitation

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

Green Obsidian Sphere (man-made glass)

Vitreous Silica with Chromium/Iron additives

Tumbled opalite (likely man-made glass)

Opalite, a trade name for opalescent glass; not natural opal

Sea Glass

Amorphous silicon dioxide

Opalite

Synthesized glass / Silicon dioxide

Blue glassy gemstone cabochon, likely dyed chalcedony or glass

Uncertain; possible dyed chalcedony (microcrystalline quartz, SiO₂)

Green glass-like mineral specimen, likely fluorite

Fluorite (calcium fluoride, CaF₂), if natural; appearance may also indicate colored glass

Sea Glass

Silicon dioxide (mostly)

Opalite

Synthetic Opalite (Man-made glass)

Goldstone

Man-made glass with copper inclusions

Opalite

Man-made Glass (SiO2 + additives)

Goldstone

Man-made glass with copper inclusions

Opalite (Man-made Glass)

Synthetic Silicon Dioxide Glass (SiO2 + metal oxides)

Clear quartz crystal (likely)

Quartz, silicon dioxide (SiO₂)

Opalite (Man-made Glass)

Synthetic Opalised Glass

Opalite (Man-made Glass)

Fused glass (typically made of dolomite and metal opacifiers)

Faceted clear gemstone, likely quartz or glass imitation

Most likely quartz (SiO₂); exact identification requires refractive-index and hardness tests

Green obsidian (likely molded or heat-treated glass-like specimen)

Volcanic glass; predominantly rhyolitic composition (silica-rich amorphous SiO₂)

Blue-green faceted gemstone, possibly glass or synthetic material

Not identifiable from the image; possible synthetic spinel or glass

Sea Glass

Man-made vitreous material

Polished white calcite sphere (identification tentative)

Calcite, CaCO₃

Sea Glass

Amorphous silicon dioxide (Man-made glass weathered by wave action)

Black glassy fragment, likely obsidian or industrial glass

Volcanic glass (obsidian), chiefly amorphous SiO₂; identification uncertain from image

Red-orange cabochon, likely carnelian or glass imitation

Carnelian: chalcedony (microcrystalline SiO₂), commonly iron-colored

Blue Goldstone

Man-made glass infused with copper crystals

Cobalt Blue Glass / Cullet Glass

Silicon dioxide (Amorphous man-made glass)

Opalite

Man-made Glass (Synthetic Opalized Glass)

Opalite

Synthetic Opalized Glass / Man-made Glass

Goldstone

Man-made glass infused with metallic copper

Opalite

Man-made Glass (Synthetic Opalized Glass)

Opalite

Man-made glass (traditionally simulated Opal)

Blue-dyed tumbled quartz or glass imitation

Quartz (SiO₂), appearance possibly enhanced with blue dye; identity uncertain from image

Goldstone

Avventurina (Man-made Glass with Copper inclusions)

Blue Goldstone

Man-made glass with cobalt and metal flecks