metamorphic
Quartz Vein in Gneiss or Schist
Metamorphic rock with SiO2 vein
Hardness: 6-7 (Mohs); Color: Grey, green-grey with white/translucent bands; Luster: Dull to vitreous; Structure: Foliated matrix with crystalline vein; Specific Gravity: 2.6-2.8.
- Hardness
- 6-7 (Mohs)
- Color
- Grey, green-grey with white/translucent bands
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 (Mohs); Color: Grey, green-grey with white/translucent bands; Luster: Dull to vitreous; Structure: Foliated matrix with crystalline vein; Specific Gravity: 2.6-2.8.
Formation & geological history
Formed under high regional pressure and temperature during mountain-building events. The white bands are quartz veins deposited by hydrothermal fluids filling fractures in the host rock.
Uses & applications
Commonly used as crushed stone in construction, road base, and landscaping. Small water-worn pebbles are popular for decorative gardens or as 'worry stones'.
Geological facts
These 'striped' rocks are often called wishing stones when the band forms a complete circle around the rock. They represent the intense tectonic forces that crack and 'heal' the Earth's crust.
Field identification & locations
Identified by the distinct white band of harder quartz cutting through a darker, often foliated metamorphic base. Very common on glacial beaches and in riverbeds.
