igneous
Basalt River Stone
Extrusive Igneous Rock
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale, dark gray to black color, aphanitic texture with fine-grained minerals, and dull luster.
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Physical properties
Hardness of 6 on the Mohs scale, dark gray to black color, aphanitic texture with fine-grained minerals, and dull luster.
Formation & geological history
Formed from the rapid cooling of low-viscosity basaltic lava exposed at or very near the Earth's surface.
Uses & applications
Commonly used in landscaping, construction aggregate, and as heat-retaining stones for massage therapy.
Geological facts
Basalt is the most common rock type in the Earth's crustal portions underlying the ocean basins and forms massive volcanic features like the Giant's Causeway.
Field identification & locations
Identify by its dark, dense, fine-grained appearance and smooth, water-worn texture found along riverbeds worldwide.
