igneous
Scoria
Vesicular Mafic Igneous Rock
AI-generated identification · may be incorrectHardness of 5-6 on the Mohs scale, dark black to reddish-brown color, dull luster, aphanitic texture with abundant vesicles, and specific gravity around 2.0-2.5.
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Physical properties
Hardness of 5-6 on the Mohs scale, dark black to reddish-brown color, dull luster, aphanitic texture with abundant vesicles, and specific gravity around 2.0-2.5.
Formation & geological history
Formed through the rapid cooling of basaltic lava containing dissolved gases that escape, creating vesicular cavities; common in volcanic regions worldwide.
Uses & applications
Used primarily in lightweight aggregate for concrete, landscaping ground cover, barbecue grill stones, and gardening.
Geological facts
Scoria is similar to pumice, but it is heavier, darker, and has larger vesicles with thicker walls, causing it to sink in water.
Field identification & locations
Easily identified by its dark, highly vesicular and frothy appearance; commonly found near volcanic cinder cones and basaltic flows.
