igneous
Vesicular Basalt (Lava Rock)
Vesicular Basalt
Hardness: 5-6 (Mohs scale), Color: Dark grey to reddish-brown (weathered to tan), Luster: Dull/Earthy, Texture: Vesicular (pitted with gas bubbles), Specific gravity: 2.8 - 3.0
Identified More igneous →
Explore Vesicular Basalt (Lava Rock) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 5-6 (Mohs scale), Color: Dark grey to reddish-brown (weathered to tan), Luster: Dull/Earthy, Texture: Vesicular (pitted with gas bubbles), Specific gravity: 2.8 - 3.0
Formation & geological history
Formed through the rapid cooling of magnesium-rich and iron-rich lava at the Earth's surface. The pits or 'vesicles' are formed by gas bubbles trapped in the cooling magma as it solidifies.
Uses & applications
Used in landscaping, aquarium decor, BBQ grills (lava rocks), and sometimes crushed for road construction or lightweight concrete aggregate.
Geological facts
This type of rock is common on the surface of the Moon and Mars. On Earth, it makes up the vast majority of the ocean floor and volcanic islands like Hawaii.
Field identification & locations
Identify by its lightweight feel compared to solid stone and the presence of numerous circular or irregular holes. Commonly found in volcanic regions or sold as garden hardscape.
