igneous
Red Scoria (Lava Rock)
Vesicular Basalt / Scoria
Hardness: 5.0-6.0; Color: reddish-brown to dark red; Luster: dull to earthy; Structure: highly vesicular (pitted with air bubbles); Specific Gravity: low due to porosity.
- Hardness
- 5
- Color
- reddish-brown to dark red
- Luster
- dull to earthy
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Physical properties
Hardness: 5.0-6.0; Color: reddish-brown to dark red; Luster: dull to earthy; Structure: highly vesicular (pitted with air bubbles); Specific Gravity: low due to porosity.
Formation & geological history
Formed from gas-rich basaltic magma cooling rapidly during volcanic eruptions, typically at the surface of lava flows or in cinder cones.
Uses & applications
Commonly used in landscaping, gas grills, hydroponics, lightweight concrete, and as high-friction material on icy roads.
Geological facts
Scoria is similar to pumice, but it has larger vesicles and thicker cell walls, and unlike pumice, most scoria will sink in water because of its higher density.
Field identification & locations
Identify by its lightweight feel, rough abrasive texture, and many small visible holes (vesicles). Commonly found in volcanic regions like the American Southwest, Iceland, and Italy.
