igneous
Basalt with Quartz Vein
Aphanitic Mafic Igneous Rock with Quartz (Silica) Intrusion
Hardness (Mohs scale 6-7), Matte black to dark grey color with a translucent white or tan vein, fine-grained (aphanitic) texture, dull luster on basalt, vitreous luster on vein.
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Physical properties
Hardness (Mohs scale 6-7), Matte black to dark grey color with a translucent white or tan vein, fine-grained (aphanitic) texture, dull luster on basalt, vitreous luster on vein.
Formation & geological history
The basalt formed from the rapid cooling of low-viscosity lava at or near the surface. The vein formed later through hydrothermal activity where silica-rich fluids filled a fracture in the rock and crystallized as quartz.
Uses & applications
Mainly used for decorative landscaping, small jewelry (tumbled stones), and as a common geological specimen for educational purposes.
Geological facts
Basalt with single veins are often referred to as 'wishing stones' in folklore, especially those found on beaches. Basalt is the most common rock type in the Earth's crust, covering most of the ocean floor.
Field identification & locations
Identify by looking for a dark, heavy rock with a distinct, continuous band of a lighter color running all the way around. Commonly found on volcanic beaches or in glacial till.
