igneous
Basalt Pebble
Extrusive igneous rock
AI-generated identification · may be incorrectHardness 6 on Mohs scale, dark gray to black color, aphanitic texture, dull luster, specific gravity 2.8-3.0.
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Physical properties
Hardness 6 on Mohs scale, dark gray to black color, aphanitic texture, dull luster, specific gravity 2.8-3.0.
Formation & geological history
Formed from the rapid cooling of low-viscosity, mafic lava flows at the Earth's surface.
Uses & applications
Used in construction, road aggregates, and landscaping due to its durability.
Geological facts
Basalt is the most common rock type in the Earth's crustal portions underlying the ocean basins and forms much of the volcanic islands worldwide.
Field identification & locations
Identified by its dark, fine-grained appearance, often found in stream beds or beaches as smooth, water-worn pebbles.
