igneous
Vein-filled Basalt
Plagioclase-pyroxene volcanic rock with calcite veins
AI-generated identification · may be incorrectHardness 6 on Mohs scale, dark green to black color with contrasting white mineral veins, dull to sub-vitreous luster, and a-phanitic fine-grained crystal structure.
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Physical properties
Hardness 6 on Mohs scale, dark green to black color with contrasting white mineral veins, dull to sub-vitreous luster, and a-phanitic fine-grained crystal structure.
Formation & geological history
Formed from the rapid cooling of magnesium and iron-rich lava flows at the Earth's surface, followed by hydrothermal fluid deposition filling fractures.
Uses & applications
Used primarily in aggregate for construction, road building, and as a geological specimen for educational purposes.
Geological facts
The distinct white lines are secondary mineral veins, usually calcite or quartz, deposited by circulating mineral-rich groundwater long after the initial rock formation.
Field identification & locations
Identify by its dark, dense matrix crossed by contrasting white fracture-filling veins. Commonly found in volcanic regions worldwide.
