igneous
Basalt with Quartz Vein
Mafic extrusive igneous rock with hydrothermal quartz (SiO2)
AI-generated identification · may be incorrectHardness 6-7 on Mohs scale for the quartz vein, 5-6 for the basalt host. Colors range from dark gray-black for the basalt to translucent brown-white for the quartz. Luster is dull to sub-vitreous.
Identified More igneous →
Explore Basalt with Quartz Vein in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness 6-7 on Mohs scale for the quartz vein, 5-6 for the basalt host. Colors range from dark gray-black for the basalt to translucent brown-white for the quartz. Luster is dull to sub-vitreous.
Formation & geological history
Formed through rapid cooling of basaltic lava flows, later fractured and filled by hydrothermal silica-rich fluids millions of years ago.
Uses & applications
Used primarily in aggregate and construction, while specimens with prominent quartz veins are collected by hobbyists.
Geological facts
Basalt is the most common rock type on Earth's crust, primarily making up oceanic crust. The contrasting lighter quartz vein provides a clear marker of secondary mineral deposition.
Field identification & locations
Identify in the field by the dark, fine-grained volcanic matrix cut through by a distinct contrasting light-colored mineral vein. Found globally in volcanic provinces and river gravels.
