Snowflake Obsidian
Spherulitic Obsidian (SiO2 + impurities)
igneous
Category
Synthetic Glass
Browse synthetic glass specimens identified by the Rock Identifier community.
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Pumice
Pumice (a highly vesicular felsic volcanic rock)
igneous
Snowflake Obsidian
Volcanic glass containing Spherulites (SiO2)
igneous
Black Obsidian
Obsidian (Amorphous Silicon Dioxide)
igneous
Pumice
Pumice (a highly vesicular volcanic glass)
igneous
Mahogany Obsidian
Obsidian (volcanic glass with hematite/magnetite inclusions)
igneous
Pumice
Pumice (Vitreous volcanic rock)
igneous
Likely weathered brown quartz-bearing rock
Tentatively weathered granite or granitic gneiss; exact identification is uncertain from the photograph
igneous
Quartz Crystal Rock
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz with inclusions
SiO2
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Clear Variety)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Yellow/Citrine variety)
Silicon Dioxide (SiO2)
mineral
Quartz (Smoky/Milky Variety)
Silicon Dioxide (SiO2)
mineral
Quartz Mineral
Silicon dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Moldavite
Moldavite (Siliceous vitreous substance)
tektite (natural glass)
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Chert or flint fragment
Microcrystalline quartz (SiO₂), likely silicified rock
sedimentary
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Black Obsidian
Volcanic Glass (Amorphous Silicon Dioxide, SiO2)
igneous
Mahogany Obsidian
Volcanic glass (SiO2 with Hematite or Magnetite inclusions)
igneous
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Quartz Arenite / Clastic Sedimentary Rock
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
White Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Geode or Vein Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral