Man Made Glass

Goldstone

Man-made glass infused with copper particles

Goldstone

Man-made glass infused with copper crystals

Blue Sandstone

Man-made glass with cobalt and copper inclusions

Blue Obsidian

Volcanic Glass (Amorphous)

Goldstone

Man-made glass containing cuprous oxide

Dragon's Breath (Mexican Opal Glass)

Artisan Foil Glass (SiO2 based)

Small black stone fragment (possibly obsidian)

Unidentified dark rock; obsidian is volcanic glass (composition typically rhyolitic)

Obsidian

Volcanic Glass

Red glassy gemstone, possibly garnet

Unidentified red transparent material; garnet group (X₃Y₂(SiO₄)₃) is a possibility

Blue Diamond

Carbon with Boron impurities (C)

Clear Quartz Sphere (Rock Crystal)

Silicon Dioxide (SiO2)

Opalite

Man-made opalescent glass

Blue opalescent glass-like gemstone (possibly imitation opalite)

Likely man-made opalite glass; composition varies, typically silica-based glass

Blue glassy gemstone-like specimen

Indeterminate; possibly dyed or treated turquoise, blue apatite, or man-made glass

Sea Glass

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

Tumbled Clear Quartz/Rock Crystal

Silicon Dioxide (SiO2)

Quartz crystal fragment (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Opalite (a synthetic glass)

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

Man-made Glass (Tumbled/Shaped)

Amorphous Silicon Dioxide (SiO2) with metal oxide colorants

Sea Glass (specifically Frosted White)

Amorphous Silica (substance: Sodium-calcium silicate glass)

Blue Goldstone

Man-made glass with crystalline copper/cobalt inclusions

Goldstone (Brown/Gold)

Aventurine Glass (Man-made glass with Copper inclusions)

Goldstone

Aventurine Glass (Man-made glass with copper inclusions)

Opalite

Synthetic Glass (Hydrated Silica Simulant)

Obsidian

Volcanic glass

Goldstone

Aventurine glass

Tumbled milky quartz

Quartz, silicon dioxide (SiO₂)

Libyan Desert Glass

Tektite (high-silica impact glass), SiO2

Blue Obsidian

Volcanic Glass (Silica, SiO2)

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

Opalite

Man-made Opalized Glass (Synthetic Glass)

Libyan Desert Glass

Libyan Desert Glass (SiO2 with trace elements)

Blue cabochon gemstone, likely synthetic glass or dyed stone

Indeterminate from image; possible glass, synthetic spinel, sodalite, or lapis lazuli

Decorative mosaic cross containing mixed rock and glass fragments

Polychrome aggregate; likely quartz, feldspar, marble, granite, and assorted colored glass

Opalite

Man-made opalized glass

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

Polished milky quartz (likely quartz worry stone or wand)

Quartz, silicon dioxide (SiO₂)

White quartz pebble

Quartz (SiO₂), likely milky quartz

Tumbled black stone, likely black obsidian

Obsidian (volcanic glass; chiefly silica-rich rhyolitic composition)

Tumbled quartz pebble

Quartz, silicon dioxide (SiO₂), likely milky quartz

Milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

Blue Glass or Slag Glass

Amorphous Silica (Anthropogenic Glass)