Igneous
Basalt with Vesicles
Vesicular Basalt
Hardness: 5-6 on Mohs scale. Color: Dark gray to black (can appear lighter depending on weathering or lighting). Luster: Dull to earthy. Structure: Fine-grained (aphanitic) with small cavities (vesicles). Specific gravity: ~2.8-3.0.
- Hardness
- 5-6 on Mohs scale
- Luster
- Dull to earthy
Identified More igneous →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 5-6 on Mohs scale. Color: Dark gray to black (can appear lighter depending on weathering or lighting). Luster: Dull to earthy. Structure: Fine-grained (aphanitic) with small cavities (vesicles). Specific gravity: ~2.8-3.0.
Formation & geological history
Formed from the rapid cooling of basaltic lava at or near the surface of the Earth. The holes (vesicles) are created by gas bubbles escaping from the cooling lava.
Uses & applications
Used primarily in construction as crushed stone, concrete aggregate, and railroad ballast. Also used as dimension stone or for landscaping.
Geological facts
Vesicular basalt is very common on Earth and makes up a significant portion of the oceanic crust. It is also found extensively on the Moon and Mars.
Field identification & locations
Identify in the field by its dark color, fine-grained texture, and the presence of small, rounded pits or cavities (vesicles) on the surface. Commonly found in areas with past or present volcanic activity, such as Hawaii, Iceland, and the Pacific Northwest.
