igneous
Tumbled Basalt
Extrusive Igneous Rock
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale, typically dark black or grey color, submetallic to dull luster, dense fine-grained aphanitic crystal structure.
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Physical properties
Hardness of 6 on the Mohs scale, typically dark black or grey color, submetallic to dull luster, dense fine-grained aphanitic crystal structure.
Formation & geological history
Formed from the rapid cooling of magnesium- and iron-rich lava exposed at or near the Earth's surface.
Uses & applications
Used in landscaping, construction aggregate, and as a polished pocket stone for meditation.
Geological facts
Basalt is the most common rock type on the Earth's oceanic crust and is also found abundantly on the Moon and Mars.
Field identification & locations
Easily identified by its dark coloration and fine-grained texture, often found along volcanic regions and riverbeds worldwide.
