mineral
Blue Obsidian (Cullet Glass)
Man-made silicate glass
AI-generated identification · may be incorrectHardness of 5.5 on the Mohs scale, vibrant blue color, vitreous luster, amorphous crystal structure, and conchoidal fracture.
Identified More mineral →
Explore Blue Obsidian (Cullet Glass) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness of 5.5 on the Mohs scale, vibrant blue color, vitreous luster, amorphous crystal structure, and conchoidal fracture.
Formation & geological history
Produced industrially as waste glass cullet, often melted and shaped to resemble natural volcanic glass.
Uses & applications
Sold as decorative lapidary rough, collector specimens, or used in glass manufacturing.
Geological facts
Despite often being sold online as natural blue obsidian, true naturally occurring blue obsidian is extremely rare; most specimens are industrial cullet glass.
Field identification & locations
Identified by internal bubbles, perfect conchoidal fracture, and a lack of true natural crystalline inclusions.
