igneous
Vesicular Basalt (Iron-rich)
Scoriaceous Basalt / Oxidized Vesicular Basalt
Hardness: 5-6 Mohs. Color: Reddish-brown to orange (due to iron oxidation). Luster: Dull, earthy. Structure: Vesicular (contains many small cavities called vesicles). Density: Medium (though lightened by voids).
- Hardness
- 5-6 Mohs
- Color
- Reddish-brown to orange (due to iron oxidation)
- Luster
- Dull, earthy
Identified More igneous →
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Physical properties
Hardness: 5-6 Mohs. Color: Reddish-brown to orange (due to iron oxidation). Luster: Dull, earthy. Structure: Vesicular (contains many small cavities called vesicles). Density: Medium (though lightened by voids).
Formation & geological history
Formed from the rapid cooling of gas-rich basaltic lava at the Earth's surface (extrusive). Gases escaping during solidification leave behind the characteristic 'bubbly' texture. The red hue occurs when iron minerals in the lava react with oxygen.
Uses & applications
Used primarily in landscaping (lava rock), construction (lightweight aggregate), BBQ pits for heat retention, and road base material.
Geological facts
Vesicular basalt is essentially the solid version of the bubbles in a soda. If the gas content is high enough, it creates 'Scoria,' which is even lighter and more riddled with holes.
Field identification & locations
Identify by its 'Swiss cheese' texture and rough, abrasive surface. Found commonly in volcanic regions such as Hawaii, Iceland, and the western United States. It is often used to study paleomagnetism and the cooling history of volcanic flows.
