igneous
Basalt Pebble
Extrusive igneous rock
AI-generated identification · may be incorrectMohs hardness of 6, dark gray to black color, dull luster, aphanitic crystal structure, high specific gravity around 2.9.
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Physical properties
Mohs hardness of 6, dark gray to black color, dull luster, aphanitic crystal structure, high specific gravity around 2.9.
Formation & geological history
Formed from the rapid cooling of low-viscosity lava rich in iron and magnesium exposed at or near the Earth's surface.
Uses & applications
Used in construction, aggregate, road base, and occasionally as decorative landscaping stones.
Geological facts
Basalt is the most common rock type on Earth's crust, primarily making up the ocean floors and forming famous geological formations like the Giant's Causeway.
Field identification & locations
Identify by its dark, fine-grained matrix and heavy feel; commonly found in riverbeds, beaches, and volcanic regions worldwide.
