igneous
Black Obsidian
Volcanic Glass
AI-generated identification · may be incorrectHardness 5-5.5 on Mohs scale, solid black color, vitreous luster, amorphous crystal structure with conchoidal fracture.
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Physical properties
Hardness 5-5.5 on Mohs scale, solid black color, vitreous luster, amorphous crystal structure with conchoidal fracture.
Formation & geological history
Formed as extrusive igneous rock when felsic lava cools rapidly with minimal crystal growth.
Uses & applications
Used historically for sharp cutting tools, arrowheads, and contemporary ornamental jewelry or metaphysical healing.
Geological facts
Despite appearing as a mineral, it is actually a mineraloid because it lacks a crystalline structure.
Field identification & locations
Identified by its intense dark color, glass-like shine, and sharp conchoidal fracture edges; found globally near recent volcanic activity.
