metamorphic
Quartz Vein in Schist
Quartz-rich Micaceous Schist (SiO2 + phyllosilicates)
Hardness: 6.5-7 (Quartz vein), 3.5-5 (Schist matrix). Color: Tan/brown host rock with a translucent greyish-white vein. Luster: Silky to vitreous. Structure: Foliated matrix with a hydrothermal crystalline vein.
- Hardness
- 6
- Color
- Tan/brown host rock with a translucent greyish-white vein
- Luster
- Silky to vitreous
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Physical properties
Hardness: 6.5-7 (Quartz vein), 3.5-5 (Schist matrix). Color: Tan/brown host rock with a translucent greyish-white vein. Luster: Silky to vitreous. Structure: Foliated matrix with a hydrothermal crystalline vein.
Formation & geological history
Formed through regional metamorphism where high pressure and temperature cause existing sedimentary or igneous rocks to recrystallize, creating a foliated texture. The vein formed later as silica-rich hydrothermal fluids filled fractures.
Uses & applications
Mostly of interest to collectors and geologists. Schist is sometimes used for paving stones or flagstones, while quartz-hosted veins can occasionally contain gold or other precious minerals.
Geological facts
Quartz veins are often the result of 'tectonic pumping' where fluids are squeezed out of rocks during mountain building. These veins can act as time capsules for the chemical conditions of Earth's crust millions of years ago.
Field identification & locations
Identify by looking for the distinct 'layered' or foliated look of the host rock and the protruding, harder quartz line. Common in mountain ranges and riverbeds near metamorphic belts.
