igneous
Lava Rock
Scoria
AI-generated identification · may be incorrectHardness of 5-6 on the Mohs scale, reddish-brown to dark gray color, dull luster, vesicular aphanitic texture, and very low specific gravity due to high porosity.
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Physical properties
Hardness of 5-6 on the Mohs scale, reddish-brown to dark gray color, dull luster, vesicular aphanitic texture, and very low specific gravity due to high porosity.
Formation & geological history
Formed from gas-rich mafic to intermediate lava that cools rapidly during volcanic eruptions, trapping gas bubbles within the rock.
Uses & applications
Used in landscaping, barbecue grills, lightweight concrete aggregate, and filtration systems.
Geological facts
Scoria is so lightweight that many varieties can float on water until the internal vesicles fill up.
Field identification & locations
Easily identified by its distinctive sponge-like, vesicular appearance and reddish or dark coloration; found globally near volcanic regions.
