igneous
Vesicular Basalt (Pumice-like)
Vesicular Basalt
Hardness: 5-6 (Mohs); Color: Dark grey to brown/tan; Luster: Dull/Earthy; Crystal structure: Aphanitic (fine-grained) with vesicles (voids); Cleavage: None; Specific gravity: 2.8-3.0.
- Hardness
- 5-6 (Mohs)
- Color
- Dark grey to brown/tan
- Luster
- Dull/Earthy
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Physical properties
Hardness: 5-6 (Mohs); Color: Dark grey to brown/tan; Luster: Dull/Earthy; Crystal structure: Aphanitic (fine-grained) with vesicles (voids); Cleavage: None; Specific gravity: 2.8-3.0.
Formation & geological history
Formed from the rapid cooling of magnesium-rich and iron-rich lava. The holes (vesicles) are created by gas bubbles trapped in the cooling magma. Found in volcanic regions worldwide, typical of Cenozoic to recent eras.
Uses & applications
Used in landscaping, construction (lightweight aggregate), BBQ grills, and as abrasive stones (pumice style) for skin exfoliation.
Geological facts
This rock is a piece of the Earth's crust; basalt is the most common rock type in the Earth's crust and makes up most of the ocean floor.
Field identification & locations
Identify by its 'holey' or porous texture and relatively heavy weight compared to true pumice. Commonly found in volcanic fields like those in the Pacific Northwest, Hawaii, or Iceland.
