igneous
Basalt Pebble
Extrusive igneous rock
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale, dark gray to black color, fine-grained aphanitic texture, and dull luster.
Identified More igneous →
Explore Basalt Pebble in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness of 6 on the Mohs scale, dark gray to black color, fine-grained aphanitic texture, and dull luster.
Formation & geological history
Formed from the rapid cooling of low-viscosity basaltic lava exposed at or near the Earth's surface.
Uses & applications
Used extensively in construction, aggregate for concrete, road base, and occasionally in dimension stone.
Geological facts
Basalt is the most common rock type in the Earth's crust underlying the ocean basins and forms columnar jointing when cooling slowly.
Field identification & locations
Easily identified by its dark, heavy, fine-grained appearance; commonly found in volcanic regions and riverbeds worldwide.
