Polished milky quartz (likely quartz worry stone or wand)
Quartz, silicon dioxide (SiO₂)
mineral
Category
Man Made Glass (Often Grouped With Minerals In Lapidary)
Browse man made glass (often grouped with minerals in lapidary) specimens identified by the Rock Identifier community.
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Concretion
Sedimentary Concretion (Ironstone / Calcite Concretion)
sedimentary
Rose Quartz and Cherry Quartz (Dyed Glass/Quartz)
Silicon Dioxide (SiO2) with inclusions/dye
gemstone
Sea Glass
Amorphous Silicon Dioxide (SiO2)
mineral
Cobalt Blue Glass / Cullet Glass
Silicon dioxide (Amorphous man-made glass)
mineral
Opalite
Synthetic glass / Opaque silicious glass
gemstone
Quartz pebble (Quartztite fragment)
Silicon Dioxide (SiO2)
mineral
Cullet Glass (Slag Glass)
Amorphous Silicon Dioxide (SiO2) with metallic oxide impurities
mineraloid
Tumbled milky quartz pebble
Quartz (silicon dioxide, SiO₂)
mineral
Blue Glass or Slag Glass
Amorphous Silica (Anthropogenic Glass)
mineral
Opalite
Synthetic Glass (Simulated Opal)
gemstone
Slag Glass
Vitreous Silicate Residue
industrial byproduct (anthropogenic rock)
Beads (likely glass or man-made material)
N/A (artificial material)
Man-made material, not a natural rock or mineral specimen
Green Obsidian Sphere (man-made glass)
Vitreous Silica with Chromium/Iron additives
mineralogical simulant
Tumbled Clear Quartz/Rock Crystal
Silicon Dioxide (SiO2)
mineral
Tumbled milky quartz pebble
Quartz (silicon dioxide, SiO₂), likely milky quartz
mineral
Blue Goldstone
Goldstone (artificial glass)
Mineral (man-made glass, not natural)
Tumbled clear quartz (rock crystal)
Quartz, silicon dioxide (SiO₂)
mineral
Blue Obsidian (Cullet Glass)
Silicon Dioxide (Amorphous Glass)
mineral
Citrine Quartz
Citrine (Silicon Dioxide, SiO2)
mineral
Cullet Glass (Slag Glass)
Amorphous Silicon Dioxide (Industrial Byproduct)
mineraloid
Dragon's Breath (Mexican Opal Glass)
Artisan Foil Glass (SiO2 based)
mineraloid
Terrazzo (Man-made Composite)
Cementitious or Resin-bound Lithic Composite
sedimentary (artificial)
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
mineral
Green obsidian (likely molded or heat-treated glass-like specimen)
Volcanic glass; predominantly rhyolitic composition (silica-rich amorphous SiO₂)
igneous
Chert Concretion
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Quartz crystal fragment (likely milky quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Blue Obsidian
Volcanic Glass (SiO2 with inclusions)
igneous
Opalite-style glass pendant
Man-made opalescent glass (not natural opal)
mineral
Opalite
Synthetic Opalized Glass / Man-made Glass
gemstone
Opalite
Synthetic Glass (Hydrated Crystalline Silicon Dioxide simulation)
mineral
N/A - Non-Geological Item
not a rock/mineral
Tumbled brown jasper
Microcrystalline quartz/chalcedony (SiO₂), commonly iron-oxide stained
sedimentary
Tumbled milky quartz
Quartz — silicon dioxide (SiO₂), cryptocrystalline or microcrystalline variety possible
mineral
Iron Slag
Iron/Steel Slag (Ferrosilicate Glass)
industrial byproduct (anthropogenic material)
Goldstone
Man-made glass infused with copper particles
gemstone
Blue Goldstone
Man-made glass infused with copper crystals
mineral
Opalite
Synthesized glass / Silicon dioxide
gemstone
Opalite (Man-made Glass)
Fused glass (typically made of dolomite and metal opacifiers)
Man-made Material / Glass
Sea Glass
Man-made silicate glass
mineral
Sea Glass
Man-made silicate glass
mineral
Blue Obsidian
Volcanic Glass (Silica, SiO2)
gemstone