igneous
Basalt with Quartz Vein
Extrusive igneous rock with SiO2 vein
AI-generated identification · may be incorrectHardness 6-7 on Mohs scale, dark gray to black matrix with a contrasting white or light-colored mineral vein, aphanitic texture, dull to sub-vitreous luster.
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Physical properties
Hardness 6-7 on Mohs scale, dark gray to black matrix with a contrasting white or light-colored mineral vein, aphanitic texture, dull to sub-vitreous luster.
Formation & geological history
Formed from rapidly cooling mafic lava flows at the Earth's surface, later fractured and hydrothermally injected with silica-rich fluids.
Uses & applications
Used in aggregate for construction, railroad ballast, and landscaping.
Geological facts
Basalt is the most common rock type of oceanic crust and forms extensive lava plateaus globally.
Field identification & locations
Identify by the dark, fine-grained volcanic matrix sharply cut by a distinct light-colored quartz or calcite vein.
