igneous
Lava Rock (Scoria)
Scoria (Basaltic Scoria)
Hardness: 5-6 (Mohs), Color: Dark brown to black or reddish-brown, Luster: Dull/Earthy, Crystal Structure: Aphanitic (fine-grained) with vesicular texture, SG: 0.8-2.1 (often floats on water briefly)
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Physical properties
Hardness: 5-6 (Mohs), Color: Dark brown to black or reddish-brown, Luster: Dull/Earthy, Crystal Structure: Aphanitic (fine-grained) with vesicular texture, SG: 0.8-2.1 (often floats on water briefly)
Formation & geological history
Formed from the rapid cooling of gas-rich basaltic lava. These vesicles are created as gases expand and become trapped within the solidifying rock during volcanic eruptions.
Uses & applications
Used in landscaping, gas grills, high-temperature insulation, drainage systems, and as an abrasive in stone-washing textiles.
Geological facts
Scoria is different from pumice in that it has larger vesicles and thicker cell walls, making it denser and darker. It often forms the main component of cinder cones.
Field identification & locations
Identify by its highly vesicular (porous) surface, lightweight feel, and sub-metallic to dull dark colors. Commonly found near dormant or active volcanic sites.
