Quartzite
Quartzite (predominantly SiO2)
metamorphic
Category
Synthetic Glass
Browse synthetic glass specimens identified by the Rock Identifier community.
Chert (varietal Flint)
Chert (SiO2)
sedimentary
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Obsidian
Volcanic Glass (70-75% SiO2)
igneous
Pumice
Pumice (Vesicular Felsic Glass)
igneous
Obsidian
Volcanic Glass (SiO2 dominant)
igneous
Mahogany Obsidian
Volcanic Glass with Hematite inclusions (SiO2 + Fe2O3)
igneous
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Granite / Quartz Vein Rock
Granitoid with Quartz (SiO2)
igneous
Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
Mineral
Chert (Nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Quartz (Citrine or Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Pebble (Sea Glass-like texture)
Silicon Dioxide (SiO2)
mineral
Fulgurite
Fulgurite (Lechatelierite)
metamorphic
Snowflake Obsidian
Spherulitic Obsidian (SiO2 + impurities)
igneous
Pumice
Pumice (a highly vesicular felsic volcanic rock)
igneous
Snowflake Obsidian
Volcanic glass containing Spherulites (SiO2)
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
Raw Green Aventurine
Aventurine Quartz (SiO2 + Fuchsite)
metamorphic
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
Mineral
Obsidian
Volcanic glass (high silica SiO2)
igneous
Quartzite Pebbles
Quartzite (SiO2)
metamorphic
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Obsidian
Obsidian (Volcanic Glass, primarily SiO2)
igneous
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Tumbled Obsidian
Volcanic Glass (Silicon Dioxide)
igneous
Rainbow Obsidian
Volcanic Glass (SiO2 + impurities)
Igneous
Tektite (Indochinite)
Tektite (Amorphous Meteoritic Glass)
igneous
Obsidian
Volcanic Glass (SiO2 rich)
igneous
Obsidian
Obsidian (Extrusive Volcanic Glass)
igneous
Scoria
Scoria (Vesicular Basaltic Glass)
Igneous
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Obsidian
Volcanic glass (Mainly SiO2)
igneous
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous