Blue Obsidian
Volcanic Glass (SiO2 with inclusions)
igneous
Category
Synthetic Glass
Browse synthetic glass specimens identified by the Rock Identifier community.
Learn about Synthetic Glass in the encyclopedia
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Black Obsidian
Volcanic Glass (SiO2 with impurities)
igneous
Obsidian Arrowhead Replica (or similar knapped stone)
Obsidian (volcanic glass) or Chert
igneous
Obsidian
Volcanic Glass (SiO2 with impurities)
igneous
Tektite (Indochinite)
Tektite (Natural silica glass)
meteorite
Obsidian
Volcanic Glass (Mainly SiO2)
igneous
Black Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Pumice
Pumice (extrusive volcanic glass)
igneous
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Obsidian
Volcanic Glass (felsic composition)
igneous
Tektite
Impactite (Natural Silicate Glass)
meteorite
Moldavite
Tektite (Natural Silica Glass)
meteorite
Black Obsidian
Volcanic Glass (SiO2 with impurities)
igneous
Mahogany Obsidian
Volcanic Glass with Hematite inclusions
igneous
Black Obsidian cabochon
Volcanic Glass (SiO2 + impurities)
igneous
Apache Tears (Tumbled Obsidian)
Volcanic Glass (SiO2 + impurities)
igneous
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Obsidian
Volcanic Glass (mostly SiO2)
igneous
Obsidian Jewelry Piece
Volcanic Glass (SiO2 + impurities)
igneous
Pumice
Pumice (a frothy volcanic glass)
igneous
Pumice
Pumice (volcanic glass foam)
igneous
Obsidian
Volcanic glass (mainly SiO2)
Igneous
Black Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Pumice
Pumice (Vesicular Volcanic Glass)
igneous
Pumice
Pumice (Vesicular volcanic glass)
igneous
Pumice
Pumice (Vesicular volcanic glass)
igneous
Slag
Anthropogenic Iron Silicate Glass
mineral
Pumice
Pumice (Vesicular volcanic glass)
igneous
Tektite (specifically Indochinite)
Tektite (Natural silica glass)
Mineraloid (Impact glass)
Obsidian (Apache Tears)
Volcanic Glass (Silicic Obsidian)
igneous
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Pumice
Pumicite (Amorphous volcanic glass)
Igneous
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Obsidian
Obsidian (Amorphous volcanic glass)
igneous
Pumice
Pumice (Vesicular volcanic glass)
igneous
Obsidian
Obsidian (Volcanic Glass, SiO2)
igneous
Apache Tear
Hydrated Obsidian (Volcanic Glass)
igneous
Black Obsidian
Volcanic Glass (SiO2 + impurities)
Igneous
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Obsidian
Obsidian (Amorphous volcanic glass)
igneous
Obsidian (specifically Rainbow or Silver Sheen Obsidian)
Volcanic Glass (predominantly SiO2)
Igneous