igneous
Green Basalt Pebble
Aphanitic Mafic Igneous Rock
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale, dark greenish-gray color, sub-conchoidal fracture, and a fine-grained aphanitic texture.
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Physical properties
Hardness of 6 on the Mohs scale, dark greenish-gray color, sub-conchoidal fracture, and a fine-grained aphanitic texture.
Formation & geological history
Formed from the rapid cooling of magnesium- and iron-rich lava flows at the Earth's surface.
Uses & applications
Used in aggregate for construction, road metal, and sometimes polished for decorative landscape features.
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 color, heavy feel relative to size, and fine-grained crystalline matrix; commonly found in riverbeds and beaches from glacial or fluvial transport.
