Pumice
Pumice (Amorphous volcanic glass)
igneous
Category
Synthetic (Man Made Glass)
Browse synthetic (man made glass) specimens identified by the Rock Identifier community.
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Black Obsidian
Amorphous volcanic glass (SiO2)
igneous
Tumbled Obsidian
Volcanic Glass (Silicon Dioxide)
igneous
Apache Tear
Obsidian (Hydrated Silica Glass)
igneous
Black Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Rainbow Obsidian
Volcanic Glass (SiO2 + impurities)
Igneous
Tektite (Indochinite)
Impact Glass (SiO2 + Al2O3)
mineraloid
Tektite (Indochinite)
Tektite (Amorphous Meteoritic Glass)
igneous
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Scoria
Scoria (Vesicular Basaltic Glass)
Igneous
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Pumice
Pumicite (Amorphous Volcanic Glass)
igneous
Pumice
Pumice (a vesicular volcanic glass)
igneous
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Pumice
Pumice (Vesicular volcanic glass)
igneous
Obsidian
Volcanic glass (Mainly SiO2)
igneous
Mahogany Obsidian
Volcanic Glass (SiO2 + Fe2O3)
igneous
Pumice
Pumice (Vesicular Felsic Glass)
igneous
Black Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Obsidian
Volcanic Glass (SiO2 rich)
Igneous
Obsidian
Obsidian (Volcanic Glass, SiO2)
igneous
Pumice
Pumice (Vesicular volcanic glass)
igneous
Pumice
Pumice (Amorphous volcanic glass)
igneous
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Pumice
Pumice (Amorphous volcanic glass)
igneous
Mahogany Obsidian
Volcanic Glass (SiO2 + Fe2O3)
igneous
Apache Tear
Hydrated Obsidians (Volcanic Glass)
igneous
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Obsidian
Volcanic Glass (mostly SiO2)
igneous
Obsidian
Obsidian (Volcanic Glass, SiO2)
igneous
Tektite (Indochinite)
Tektite (Natural silica glass)
igneous
Obsidian
Volcanic Glass (SiO2 dominant)
igneous
Pumice
Pumice (a vesicular volcanic glass)
igneous
Mahogany Obsidian
Volcanic glass (SiO2 + Fe2O3)
igneous
Pumice
Pumice (Vesicular volcanic glass)
igneous
Pumice
Pumicite (Amorphous Volcanic Glass)
igneous
Tumbled milky quartz (likely quartz pebble)
Quartz, silicon dioxide (SiO₂)
mineral
Weathered quartz-rich cobble, possibly quartzite or feldspar-rich granite
Quartz–feldspar aggregate; identification is uncertain from the photograph
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral