igneous
Obsidian Projectile Point
Volcanic Glass (Amorphous SiO2)
AI-generated identification · may be incorrectHardness of 5 to 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 to 5.5 on the Mohs scale, deep black color, vitreous luster, amorphous crystal structure with conchoidal fracture.
Formation & geological history
Formed from rapidly cooling felsic lava extruded from volcanoes, preventing crystal growth.
Uses & applications
Historically used for cutting tools and weapons; currently collected as artifacts and lapidary specimens.
Geological facts
Obsidian breaks to create extremely sharp edges, often only a few nanometers thick, making it sharper than surgical steel.
Field identification & locations
Identified by its glass-like appearance, conchoidal fracture, and sharpness; commonly found in regions of recent volcanic activity.
