igneous
Scoria
Mafic to intermediate volcanic rock
AI-generated identification · may be incorrectHardness of 5 to 6 on the Mohs scale, reddish-brown to dark gray color, dull luster, vesicular texture with numerous gas cavities, specific gravity around 2.0 to 2.5.
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Physical properties
Hardness of 5 to 6 on the Mohs scale, reddish-brown to dark gray color, dull luster, vesicular texture with numerous gas cavities, specific gravity around 2.0 to 2.5.
Formation & geological history
Formed through the rapid cooling of frothy, gas-rich basaltic or intermediate lava ejected from volcanic vents, commonly occurring globally near volcanic arcs and rift zones.
Uses & applications
Widely used in landscaping, lightweight aggregate in concrete, gas barbecue grills, and as an abrasive in personal care products.
Geological facts
Scoria is often confused with pumice, but it is denser, darker, and typically sinks in water due to non-interconnected vesicles.
Field identification & locations
Easily identified in the field by its distinct vesicular, bubble-pocked surface and reddish-brown color; common in volcanic regions worldwide.
