metamorphic
Quartzite with Epidote Vein
Metamorphosed Quartz Sandstone with Hydrothermal Vein
Hardness: 7 on Mohs scale (quartz host). Color: Reddish-brown host with a pale green mineral vein. Luster: Vitreous to dull. Crystal structure: Trigonal (quartz) and monoclinic (epidote). Cleavage: None distinct in the massive quartz matrix.
- Hardness
- 7 on Mohs scale (quartz host)
- Color
- Reddish-brown host with a pale green mineral vein
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale (quartz host). Color: Reddish-brown host with a pale green mineral vein. Luster: Vitreous to dull. Crystal structure: Trigonal (quartz) and monoclinic (epidote). Cleavage: None distinct in the massive quartz matrix.
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone (creating quartzite), which was later fractured and intruded by hydrothermal fluids depositing epidote and associated minerals in the crack.
Uses & applications
Used as decorative landscape stone, gravel, and occasionally carved or polished by rock collectors.
Geological facts
Rocks featuring contrasting mineral veins like this are often called 'wishbone' or 'banded' rocks by beachcombers and are popular tumbling and display specimens.
Field identification & locations
Easily identified in the field by a hard, weather-resistant quartz matrix cut through by a distinct contrasting vein of a different mineral composition. Common in glacial tills, riverbeds, and mountainous regions worldwide.
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