Slag Glass
Amorphous Silica Glass (with metal oxide inclusions)
Mineraloid / Industrial Waste
Category
Glass
Browse glass specimens identified by the Rock Identifier community.
Learn about Glass in the encyclopedia
View all →
Sea Glass
Man-made vitreous material (silica-based glass)
mineral
Sea Glass
Man-made silicate glass (Amorphous silicon dioxide)
sedimentary
Sea Glass
Amorphous Silicon Dioxide (Man-made glass weathered by nature)
mineral
Sea Glass
Amorphous silicon dioxide (man-made glass weathered by nature)
mineral
Sea Glass
Man-made silicate glass
gemstone
Sea Glass
Man-made silicate glass (Amorphous silicon dioxide)
mineral
Slag Glass
Vitreous Silicate Residue
industrial byproduct (anthropogenic rock)
Sea Glass
Amorphous Silica (Anthropogenic glass) - SiO2
mineral
Slag Glass
Amorphous Silicate (Man-made)
industrial byproduct
Slag Glass
Glassy Silicate Residue
industrial byproduct
Strawberry Quartz and Rose Quartz
Silicon Dioxide (SiO2) with inclusions
mineral
Milky quartz (likely)
Quartz, silicon dioxide (SiO₂)
mineral
Slag (Industrial Glass/Glassy Rock)
Anthropogenic Vitreous Material
igneous
Green sea glass (likely)
Man-made glass, likely soda-lime silicate glass; not a natural mineral or rock
mineral
Polished black gemstone, likely obsidian
Volcanic glass; primarily silica-rich rhyolitic composition (approximately SiO₂)
igneous
Amethyst (Chevron Amethyst/Dream Amethyst)
Silicon Dioxide (SiO2) with trace Iron impurities
mineral
Blue opalescent glass-like gemstone (possibly imitation opalite)
Likely man-made opalite glass; composition varies, typically silica-based glass
gemstone
Opalite
Synthetic glass (SiO2 + impurities)
mineral
Clear Quartz (Faceted Crystal)
Silicon Dioxide (SiO2)
mineral
Sea Glass (Uranium/Vaseline Glass variant)
Silicon Dioxide (SiO2) with trace Uranium Oxide (U3O8)
man-made silicate (anthropogenic glass)
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Likely rough amethyst (purple quartz)
Quartz, SiO₂; amethyst variety
mineral
Clear quartz crystal pendant
Quartz (silicon dioxide, SiO₂)
mineral
Amethyst geode
Quartz, SiO₂; purple variety amethyst, commonly a drusy-lined geode
mineral
Rose quartz
Quartz, silicon dioxide (SiO₂), pink variety
mineral
Polished carnelian agate
Microcrystalline quartz (chalcedony), SiO₂, colored mainly by iron oxides
gemstone
Green beryl (likely heliodor)
Beryl, Be₃Al₂Si₆O₁₈; yellow-green varieties are heliodor or golden beryl
mineral
Amethyst
Quartz (SiO₂), purple variety colored mainly by iron impurities and irradiation
gemstone
Tumbled emerald chips
Emerald, green beryl (Be₃Al₂Si₆O₁₈), colored mainly by chromium and/or vanadium
gemstone
Polished amethyst
Quartz, SiO₂; purple variety colored mainly by iron-related defects and irradiation
mineral
Tumbled amethyst
Amethyst, purple variety of quartz (SiO₂)
mineral
Tumbled rose quartz (probable)
Quartz, silicon dioxide (SiO₂), pink variety
mineral
Yellow chalcedony (likely lemon quartz or citrine)
Cryptocrystalline silica, SiO₂; possible quartz variety
mineral
Citrine
Citrine (Silicon Dioxide - SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz crystal beads
Quartz (silicon dioxide, SiO₂)
mineral
Fulgurite
Fulgurite (Lechatelierite/Silica glass)
mineral