igneous
Basalt Pebble
Extrusive igneous rock
AI-generated identification · may be incorrectHardness 6 on Mohs scale, dark gray to black color, dull luster, fine-grained aphanitic crystal structure, and high specific gravity.
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 6 on Mohs scale, dark gray to black color, dull luster, fine-grained aphanitic crystal structure, and high specific gravity.
Formation & geological history
Formed from the rapid cooling of mafic lava flows at the Earth's surface over millions of years.
Uses & applications
Used in construction, aggregate, road base, and landscaping.
Geological facts
Basalt is the most common rock type in the Earth's crustal portions underlying the ocean basins.
Field identification & locations
Identified by its dark, fine-grained appearance and rounded shape from water transport, commonly found in riverbeds and beaches.
