igneous
Scoria
Vesicular Mafic Extrusive Igneous Rock
AI-generated identification · may be incorrectHardness of 5-6 on the Mohs scale, typically dark brown, reddish, or black in color with a dull luster and a highly vesicular, glassy aphanitic texture containing numerous gas cavities.
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Physical properties
Hardness of 5-6 on the Mohs scale, typically dark brown, reddish, or black in color with a dull luster and a highly vesicular, glassy aphanitic texture containing numerous gas cavities.
Formation & geological history
Formed when gas-rich mafic or intermediate lava cools rapidly near the surface of a volcano, trapping gas bubbles within the solidifying molten rock.
Uses & applications
Widely used in lightweight concrete aggregates, landscaping ground cover, gas barbecue grills, and personal care products for exfoliation.
Geological facts
Due to its high density of trapped air bubbles, many varieties of scoria are low in density and have the unusual property of being able to float on water.
Field identification & locations
Easily identified in the field by its distinct sponge-like, vesicular appearance and reddish-brown or black color. Found worldwide near volcanic regions and cinder cones.
