igneous
Scoria
Mafic to intermediate volcanic rock
AI-generated identification · may be incorrectHardness of 5-6 on the Mohs scale, dark brown to black color, dull luster, vesicular aphanitic texture with numerous gas cavities, and floats on water if vesicles are sealed.
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Physical properties
Hardness of 5-6 on the Mohs scale, dark brown to black color, dull luster, vesicular aphanitic texture with numerous gas cavities, and floats on water if vesicles are sealed.
Formation & geological history
Formed from gas-rich mafic or intermediate lava ejected from volcanic vents during explosive eruptions, cooling rapidly to trap gas bubbles.
Uses & applications
Used in lightweight aggregate concrete, landscaping mulch, gas barbecue grills, and drainage systems.
Geological facts
Commonly known as volcanic cinder, scoria often forms cinder cones around volcanic vents. Unlike pumice, scoria has denser walls and sinks in water.
Field identification & locations
Easily identified by its dark color, heavy weight compared to pumice, and rough vesicular texture. Found worldwide near volcanic regions.
