igneous
Basalt River Pebbles
Mafic Volcanic Rock (主要成分: SiO2, MgO, FeO)
Hardness: 6.0 on Mohs scale; Color: dark grey to black/brown; Luster: dull to earthy; Crystal structure: aphanitic (fine-grained); Specific gravity: 2.8-3.0.
- Hardness
- 6
- Color
- dark grey to black/brown
- Luster
- dull to earthy
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Physical properties
Hardness: 6.0 on Mohs scale; Color: dark grey to black/brown; Luster: dull to earthy; Crystal structure: aphanitic (fine-grained); Specific gravity: 2.8-3.0.
Formation & geological history
Formed from the rapid cooling of magnesium-rich and iron-rich lava at or near the Earth's surface. These specific specimens have been rounded and polished through fluvial transport (river action) or wave action.
Uses & applications
Used primarily in landscaping, aquarium decor, and aggregate for construction. High-quality basalt is used for stone massage therapy and decorative home accents.
Geological facts
Basalt is the most common rock type in the Earth's crust and makes up most of the ocean floor. It is juga found on the Moon and Mars.
Field identification & locations
Identify by its dark color, heavy weight relative to size, and fine-grained texture. Collected easily in riverbeds or volcanic coastal areas. Look for smoothness indicating water erosion.
