Chert (Jasper variation)
Chert (Cryptocrystalline microcrystalline Silicon Dioxide, SiO2)
sedimentary
Category
Synthetic Glass
Browse synthetic glass specimens identified by the Rock Identifier community.
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Rose Quartz
Silicon Dioxide (SiO2) with trace Titanium, Manganese, or Iron
mineral
Chert (Flint)
Chert (SiO2)
sedimentary
Citrine (Heat-treated Amethyst)
Citrine Quartz (SiO2)
Mineral (Tectosilicate)
Chert / Flint
Silicon Dioxide (SiO₂)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Iron Slag
Anthropogenic Iron Silicate
industrial byproduct
Tumbled rose quartz (likely)
Quartz, silicon dioxide (SiO₂), probably rose quartz
gemstone
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Rounded quartz-rich beach pebble
Likely milky quartz or quartzite (SiO₂)
mineral
Tumbled amethyst
Quartz, purple variety; silicon dioxide (SiO₂), colored mainly by iron impurities and irradiation
mineral
Smoky quartz (rough, water-worn crystal)
Quartz, silicon dioxide (SiO₂), smoky variety
mineral
Obsidian
Volcanic Glass (SiO2)
igneous
Pumice
Pumice (volcanic glass)
igneous
Fulgurite
Luechatelierite (SiO2 glass)
mineraloid
Pumice
Pumice (volcanic glass)
igneous
Sea Glass (Teal/Turquoise)
Amorphous Silica (SiO2) with trace metal oxides
Anthropogenic (Man-made material processed by nature)
Slag (Industrial Byproduct)
Ferro-silicate glass (Slag)
Anthropogenic (Man-made industrial deposit)
Pumice
Pumice (Volcanic Glass)
igneous
Tektite
Natural impact glass
meteorite
Fulgurite
Lechatelierite (Silica glass)
mineral
Black Obsidian
Volcanic Glass (SiO2)
igneous
Tektite
Tektite (meteoritic glass)
meteorite
Pumice
Pumice (Volcanic Glass)
igneous
Black Obsidian
Volcanic Glass (SiO2)
igneous
Obsidian
Obsidian (volcanic glass)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Obsidian Arrowhead
Volcanic Glass (SiO2)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Pumice
Pumice (volcanic glass)
igneous
Black Obsidian
Obsidian (Volcanic Glass)
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Black Obsidian
Volcanic Glass (SiO2)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Pumice
Pumice (volcanic glass)
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous