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 vesicular cavities, 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 vesicular cavities, specific gravity around 2.0-2.5.
Formation & geological history
Formed during explosive volcanic eruptions when gas-rich mafic lava cools rapidly, trapping gas bubbles as vesicles.
Uses & applications
Used in landscaping, lightweight aggregate in concrete, gas barbecue grills, and personal care as a pumice-like abrasive stone.
Geological facts
Scoria often forms volcaniccinders and can sometimes float on water initially if trapped air makes it buoyant, though it typically sinks faster than pumice.
Field identification & locations
Easily identified by its dark color, heavy weight compared to pumice, and rough, highly vesicular texture; found near volcanic regions worldwide.
