Chert Pebble (Flint)
Microcrystalline/Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Mineraloid (Impact Glass)
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Quartz River Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Snowflake Obsidian
Volcanic Glass with Spherulite Inclusions (70–75% SiO2)
igneous
Snowflake Obsidian
Volcanic glass with Cristobalite inclusions (mostly SiO2)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Libyan Desert Glass
Impactite silica glass (SiO2)
tektite (impact glass)
Moldavite
Tektite (Silica Glass - SiO2 + Al2O3, FeO, MgO, CaO, Na2O, K2O)
gemstone
Tektite (Indochinite)
Tektite (Amorphous Silica Glass), SiO2(Al2O3)
igneous
Snowflake Obsidian
Volcanic Glass (SiO2) with Cristobalite inclusions
igneous
Snowflake Obsidian
Volcanic Glass with Cristobalite Inclusions
igneous
Snowflake Obsidian
Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)
igneous
Snowflake Obsidian
Volcanic Glass with Cristobalite inclusions (70–75% SiO2)
Igneous
Quartzite River Cobble
Quartzite (primarily SiO2)
metamorphic
Tektite (Indochinite)
Tektite (High-silica natural glass)
mineralogical glass/meteorite impactite
Black Obsidian
Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)
igneous
Quartz Pebble (River Agate / Chalcedony)
Silicon Dioxide (SiO2)
mineral
Black Obsidian
Volcanic glass
igneous
Obsidian
Volcanic Glass
igneous
Snowflake Obsidian
Volcanic Glass with Spherulite Inclusions (70-75% SiO2)
igneous
Tektite (Indochinite)
Tektite (Amorphous Meteoritic Glass)
igneous
Snowflake Obsidian
Obsidian with Spherulitic Cristobalite (SiO2)
igneous
Obsidian
Volcanic glass
igneous
Quartzite River Rock
Metamorphic Quartzite (SiO2)
metamorphic
Pyrite (Fool's Gold)
Iron Pyrite (FeS2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Mahogany Obsidian
Volcanic Glass with Hematite inclusions (SiO2 + Fe2O3)
igneous
Snowflake Obsidian
Volcanic glass (SiO2) with Cristobalite (SiO2) inclusions
igneous
Obsidian
Volcanic glass
igneous
Black Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Moldavite
Tektite (Natural Silica Glass)
meteorite
Opalite
Synthetic Glass (Silica-based)
gemstone
Sea Glass (Frosted Quartz/Glass)
Amorphous Silicon Dioxide (SiO2)
Mineraloid
Cullet Glass (Slag)
Amorphous Silicon Dioxide (Man-made)
Mineraloid
Mahogany Obsidian
Obsidian (Volcanic Glass with Hematite/Magnetite inclusions), SiO2
igneous
Obsidian
Volcanic Glass (70-75% SiO2 with MgO and Fe3O4)
igneous
Black Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Opalite
Man-made Glass (Synthetic Opalized Glass)
gemstone
Black Obsidian
Volcanic Glass (Amorphous SiO2 with trace impurities)
igneous
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Black Obsidian
Volcanic Glass (SiO2 + impurities)
Igneous
Cullet Glass (Slag Glass)
Amorphous Silicon Dioxide (SiO2) with metallic oxide impurities
mineraloid
Mahogany Obsidian
Volcanic glass (SiO2 with Hematite/Magnetite inclusions)
igneous