Obsidian Arrowhead
Volcanic Glass (predominantly SiO2)
igneous
Category
Mineraloid (Man Made Glass)
Browse mineraloid (man made glass) specimens identified by the Rock Identifier community.
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Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pumice
Pumice (Volcanic Glass Foam)
igneous
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Snowflake Obsidian
Volcanic Glass with Cristobalite Inclusions
igneous
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Fulgurite
Lechatelierite (Silica glass tubes)
mineral
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
Moldavite
Tektite (Natural Silica Glass)
meteorite
Black Obsidian
Volcanic Glass (SiO2 with impurities)
igneous
Black Obsidian cabochon
Volcanic Glass (SiO2 + impurities)
igneous
Apache Tears (Tumbled 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
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
Apache Tear
Hydrated Obsidian (Volcanic Glass)
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
Apache Tear
Obsidian (Hydrated Volcanic Glass)
igneous
Obsidian
Volcanic Glass (SiO2 with impurities)
igneous