igneous
Mahogany Obsidian
Volcanic Glass with Iron Inclusions
AI-generated identification · may be incorrectMohs hardness 5 to 5.5, dark brown and black coloration with flame-like streaks, vitreous luster, amorphous crystal structure, conchoidal fracture, specific gravity 2.35 to 2.45.
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Physical properties
Mohs hardness 5 to 5.5, dark brown and black coloration with flame-like streaks, vitreous luster, amorphous crystal structure, conchoidal fracture, specific gravity 2.35 to 2.45.
Formation & geological history
Formed from rapidly cooling felsic lava with iron and magnetite inclusions, predominantly originating in volcanic environments worldwide.
Uses & applications
Widely utilized for ornamental carvings, polished gemstones, metaphysical applications, and historic cutting implements.
Geological facts
The distinctive brownish-red patches are caused by iron oxide or hematite trapped within the natural volcanic glass during rapid cooling.
Field identification & locations
Easily identified by its glass-like texture, conchoidal fracture, and characteristic black and brown coloration; commonly sourced from Mexico and the western United States.
