igneous
Scoria
Extrusive Igneous Rock
AI-generated identification · may be incorrectHardness 5-6 on Mohs scale, dark brown to black or reddish color, dull luster, vesicular aphanitic texture with numerous gas cavities.
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Physical properties
Hardness 5-6 on Mohs scale, dark brown to black or reddish color, dull luster, vesicular aphanitic texture with numerous gas cavities.
Formation & geological history
Formed from gas-rich mafic or intermediate lava that rapidly cools and solidifies, trapping gas bubbles as it erupts from volcanoes.
Uses & applications
Used in landscaping, lightweight aggregate for concrete, barbecues as lava rock, and soil conditioning.
Geological facts
Scoria is often confused with pumice, but unlike pumice, it is denser than water and usually sinks.
Field identification & locations
Easily identified by its dark color, heavy weight compared to pumice, and prominent vesicular holes; found near volcanic regions worldwide.
