Man Made Glass (Often Grouped With Minerals In Lapidary)

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (SiO2) with metallic oxide impurities

Slag Glass

Vitreous Silicate Residue

Beads (likely glass or man-made material)

N/A (artificial material)

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky quartz

Green Obsidian Sphere (man-made glass)

Vitreous Silica with Chromium/Iron additives

Blue Goldstone

Goldstone (artificial glass)

Tumbled clear quartz (rock crystal)

Quartz, silicon dioxide (SiO₂)

Tumbled Clear Quartz/Rock Crystal

Silicon Dioxide (SiO2)

Blue Obsidian (Cullet Glass)

Silicon Dioxide (Amorphous Glass)

Chert Concretion

Chert (Microcrystalline Quartz, SiO2)

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial Byproduct)

Citrine Quartz

Citrine (Silicon Dioxide, SiO2)

Dragon's Breath (Mexican Opal Glass)

Artisan Foil Glass (SiO2 based)

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

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

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

Terrazzo (Man-made Composite)

Cementitious or Resin-bound Lithic Composite

Quartz crystal fragment (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Opalite

Synthetic Glass (Hydrated Crystalline Silicon Dioxide simulation)

Iron Slag

Iron/Steel Slag (Ferrosilicate Glass)

Blue Obsidian

Volcanic Glass (SiO2 with inclusions)

Tumbled milky quartz

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

N/A - Non-Geological Item

Opalite

Synthetic glass (SiO2 + metal additions)

Opalite

Synthetic Opalized Glass / Man-made Glass

Tumbled brown jasper

Microcrystalline quartz/chalcedony (SiO₂), commonly iron-oxide stained

Dyed Blue Agate (Dragon Vein Agate)

Silicon Dioxide (SiO2) with artificial cobalt/organic dyes

Opalite (a synthetic glass)

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

Opalite (Man-made Glass)

Fused glass (typically made of dolomite and metal opacifiers)

Opalite

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

Tumbled milky quartz

Quartz (SiO₂), cryptocrystalline-to-massive variety

Tumbled milky chalcedony (likely common opalite-like quartz)

Chalcedony, microcrystalline SiO₂; possibly pale common opal, hydrated SiO₂·nH₂O

Opalite

Synthetic Opalised Glass

Costume Jewelry with Synthetic Gemstones

Synthetic Cubic Zirconia and Glass (SiO2 / ZrO2)

Green sea glass (likely slag glass or bottle glass)

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

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial Man-made)

Clear quartz crystal (likely)

Quartz, silicon dioxide (SiO₂)

Tumbled jasper (likely brecciated or leopardskin jasper)

Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide and other mineral inclusions

Opalite glass sphere (likely synthetic imitation)

Man-made opalescent glass; not natural opal

Tumbled jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), commonly containing iron oxides and other silicates

Opalite

Synthetic Glass (Silica-based)

Tumbled jasper, likely picture jasper or brecciated jasper

Microcrystalline quartz (SiO₂), chiefly chalcedony with iron-oxide pigments

Blue Slag Glass

Anthropogenic Amorphous Silicon Dioxide