igneous
Basalt Puddle Stone
Basalt (Mafic volcanic rock)
Hardness: 6-7 (Mohs scale); Color: Dark grey to charcoal; Luster: Dull to earthy; Texture: Fine-grained (aphanitic) to vesicular; Structure: Dense volcanic crystal matrix; Specific gravity: 2.8-3.0.
- Hardness
- 6-7 (Mohs scale)
- Color
- Dark grey to charcoal
- Luster
- Dull to earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Dark grey to charcoal; Luster: Dull to earthy; Texture: Fine-grained (aphanitic) to vesicular; Structure: Dense volcanic crystal matrix; Specific gravity: 2.8-3.0.
Formation & geological history
Formed from the rapid cooling of magnesium-rich and iron-rich lava at the earth's surface. This specific specimen appears to be a water-worn or tumbled cobble from a riverbed or coastal environment.
Uses & applications
Commonly used in construction as aggregate, in road building, or for landscaping. Polished stones are used in hot stone massage and decorative rock collections.
Geological facts
Basalt is the most common rock type in the Earth's crust and makes up most of the ocean floor. It is also found extensively on the Moon and Mars.
Field identification & locations
Look for a heavy, dark-colored stone with a very fine texture. It is often found in volcanic regions, along rocky coastlines, or in glacial till.
