igneous
Black Obsidian Carving
Volcanic Glass (Amorphous Silicon Dioxide)
AI-generated identification · may be incorrectHardness of 5-5.5 on the Mohs scale, deep black color, vitreous luster, amorphous crystal structure with conchoidal fracture.
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Physical properties
Hardness of 5-5.5 on the Mohs scale, deep 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, often in volcanic environments.
Uses & applications
Used in ornamental carvings, jewelry, lapidary art, and historically for sharp cutting tools.
Geological facts
Ancient cultures utilized obsidian for making arrowheads and blades due to its extremely sharp edges when fractured.
Field identification & locations
Identified by its shiny black appearance, glass-like texture, and distinct conchoidal fracture patterns; found worldwide near recent volcanic activity.
