igneous
Scoria
Mafic to intermediate volcanic rock
AI-generated identification · may be incorrectHardness of 5-6 on the Mohs scale, dark brown to black or reddish-gray color, dull luster, vesicular texture with numerous gas cavities, and specific gravity around 2.0-2.5.
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Physical properties
Hardness of 5-6 on the Mohs scale, dark brown to black or reddish-gray color, dull luster, vesicular texture with numerous gas cavities, and specific gravity around 2.0-2.5.
Formation & geological history
Formed from gas-rich frothy lava expelled from volcanic vents, cooling rapidly during explosive eruptions to trap gas bubbles within a glassy or finely crystalline matrix.
Uses & applications
Used in landscaping, lightweight aggregate in concrete, gas barbecue grill rocks, and soil conditioning or drainage.
Geological facts
Unlike pumice, scoria is denser than water and typically sinks, despite its highly porous and vesicular appearance.
Field identification & locations
Easily identified by its rough, bubbly, cinder-like texture and dark color; common near volcanic cones and cinder fields worldwide.
