igneous
Mahogany Obsidian
Volcanic Glass with Iron Oxide Inclusions
AI-generated identification · may be incorrectMohs hardness of 5 to 5.5, black and reddish-brown coloration, vitreous luster, amorphous crystal structure with conchoidal fracture.
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Physical properties
Mohs hardness of 5 to 5.5, black and reddish-brown coloration, vitreous luster, amorphous crystal structure with conchoidal fracture.
Formation & geological history
Formed from rapidly cooling felsic lava where iron and magnetite impurities create distinctive brown patches within natural volcanic glass.
Uses & applications
Used primarily for polished gemstones, ornamental carvings, and holistic crystal collections.
Geological facts
The reddish-brown patterns are caused by hematite or magnetite inclusions embedded within the glossy black volcanic glass matrix.
Field identification & locations
Easily identified by its smooth glassy luster combined with contrasting black and mahogany-brown patches; commonly sourced from volcanic regions like the USA and Mexico.
