igneous
Scoria
Vesicular Mafic Igneous Rock
Hardness of 5-6 on the Mohs scale, colors range from black, dark brown, to reddish-brown, dull luster, vesicular texture with numerous gas cavities, specific gravity around 2.0-2.5.
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Physical properties
Hardness of 5-6 on the Mohs scale, colors range from black, dark brown, to reddish-brown, dull luster, vesicular texture with numerous gas cavities, specific gravity around 2.0-2.5.
Formation & geological history
Forms from gas-rich mafic or intermediate lava that cools rapidly near the surface of a volcano, trapping gas bubbles within the solidifying rock.
Uses & applications
Used in landscaping, lightweight aggregate in concrete, gas barbecue grills, and as an abrasive in skincare products.
Geological facts
Because of its high vesicle content, many varieties of scoria are dense enough to float on water initially before water eventually fills the pores.
Field identification & locations
Easily identified by its dark color, rough texture, and abundance of visible gas bubbles (vesicles). Found worldwide near volcanic regions and cinder cones.
