mineral
Green Obsidian or Slag Glass
Amorphous Silicon Dioxide (SiO2) glass
AI-generated identification · may be incorrectHardness of 5-6 on the Mohs scale, vitreous luster, vivid green color, and characteristic conchoidal fracture with internal bubbles.
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Physical properties
Hardness of 5-6 on the Mohs scale, vitreous luster, vivid green color, and characteristic conchoidal fracture with internal bubbles.
Formation & geological history
Formed as a byproduct of industrial metal smelting or rapid cooling of silica-rich melts.
Uses & applications
Popular among lapidary artists for cabochons, decorative sculptures, and mineral collections.
Geological facts
Often mistaken for natural volcanic glass like obsidian, but distinguished by internal air bubbles and industrial origins.
Field identification & locations
Identify by its glassy luster, conchoidal breakage, and lack of true crystal structure; commonly found near historic industrial sites.
