Snowflake Obsidian
Spherulitic Obsidian (SiO2 + impurities)
igneous
Category
Manufactured Glass
Browse manufactured glass specimens identified by the Rock Identifier community.
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
Obsidian
Volcanic glass (high silica SiO2)
igneous
Obsidian (Gold Sheen)
Obsidian (SiO2 + impurities)
igneous
Raw Green Aventurine
Aventurine Quartz (SiO2 + Fuchsite)
metamorphic
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Obsidian
Obsidian (Volcanic Glass, primarily SiO2)
igneous
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Goldstone (Red)
Aventurine Glass (SiO2 + Cu)
Synthetic Glass (Often categorized as a simulated mineral)
Rainbow Obsidian
Volcanic Glass (SiO2 + impurities)
Igneous
Tumbled Obsidian
Volcanic Glass (Silicon Dioxide)
igneous
Obsidian
Volcanic glass (Mainly SiO2)
igneous
Obsidian
Volcanic Glass (SiO2 rich)
igneous
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Tektite (Indochinite)
Tektite (Amorphous Meteoritic Glass)
igneous
Scoria
Scoria (Vesicular Basaltic Glass)
Igneous
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Obsidian
Obsidian (Extrusive Volcanic Glass)
igneous
Pumice
Pumicite (Amorphous Volcanic Glass)
igneous
Pumice
Pumice (Vesicular volcanic glass)
Igneous
Black Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Obsidian
Volcanic Glass (SiO2 rich)
Igneous
Obsidian
Obsidian (Volcanic Glass, SiO2)
igneous
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Obsidian
Volcanic Glass (mostly SiO2)
igneous
Mahogany Obsidian
Volcanic Glass (SiO2 + Fe2O3)
igneous
Pumice
Pumice (a vesicular volcanic glass)
igneous
Pumice
Pumicite (Amorphous Volcanic Glass)
igneous
Apache Tear
Hydrated Obsidians (Volcanic Glass)
igneous
Mahogany Obsidian
Volcanic glass (SiO2 + Fe2O3)
igneous
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Iron Inclusions
Crystalline Silicon Dioxide (SiO2)
mineral
Obsidian (Black Obsidian)
Amorphous volcanic glass (primarily SiO2)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary