igneous
Scoria
Vesicular Mafic Extrusive Igneous Rock
AI-generated identification · may be incorrectHardness is 5-6 on the Mohs scale, color ranges from dark brown to reddish-black, and it features a dull luster with a highly vesicular and frothy texture.
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Physical properties
Hardness is 5-6 on the Mohs scale, color ranges from dark brown to reddish-black, and it features a dull luster with a highly vesicular and frothy texture.
Formation & geological history
Formed from gas-rich mafic lava that cools rapidly near the surface, allowing expanding gas bubbles to create its characteristic holes.
Uses & applications
Widely used in landscaping, lightweight aggregate for concrete, barbecues, and as an abrasive media.
Geological facts
Scoria has a low specific gravity and can often float on water initially due to its trapped gas pockets, earning it the nickname volcanic cinder.
Field identification & locations
Easily identified by its dark, reddish-brown color, sharp texture, and abundant visible vesicles; commonly found near volcanic vents and cinder cones worldwide.
