igneous
Basalt
Extrusive Igneous Rock
AI-generated identification · may be incorrectHardness of 6 on Mohs scale. Typically dark grey to black with an aphanitic texture.
Identified More igneous →
Explore Basalt in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness of 6 on Mohs scale. Typically dark grey to black with an aphanitic texture.
Formation & geological history
Formed from the rapid cooling of low-viscosity lava rich in iron and magnesium exposed at or very near the surface.
Uses & applications
Used extensively in construction, aggregate for concrete, road base, and crushed stone.
Geological facts
Basalt is the most common rock type in the Earth's crustal portions underlying the ocean basins.
Field identification & locations
Identify by its dark color, fine-grained texture, and heavy weight relative to its size.
