igneous
Vesicular Basalt (Lava Rock)
Vesicular Basalt
Hardness: 5-6 Mohs. Color: Tan, brown, or reddish-brown (weathered). Luster: Dull/Earthy. Texture: Vesicular (pitted with gas bubbles).
- Hardness
- 5-6 Mohs
- Color
- Tan, brown, or reddish-brown (weathered)
- Luster
- Dull/Earthy
Identified More igneous →
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Physical properties
Hardness: 5-6 Mohs. Color: Tan, brown, or reddish-brown (weathered). Luster: Dull/Earthy. Texture: Vesicular (pitted with gas bubbles).
Formation & geological history
Forms from the rapid cooling of magnesium-rich and iron-rich lava at or near the Earth's surface. The pits formed as gas bubbles escaped the cooling magma.
Uses & applications
Used in landscaping, as a construction aggregate, in gas grills for heat retention, and in high-temperature industrial filters.
Geological facts
The holes in this rock are called vesicles. When these holes are later filled with minerals like calcite or quartz, the rock is called amygdaloidal basalt.
Field identification & locations
Identify by its lightweight feel compared to solid rock and the presence of small, irregular holes. Common in volcanic regions globally.
