metamorphic
Quartzite Pebble with Quartz Vein
Metamorphic Sandstone (Quartzite) with Hydrothermal Quartz
Hardness: 7 on Mohs scale; Color: Brownish-tan matrix with a white central band; Luster: Dull to vitreous; Structure: Granular/Crystalline; Specific Gravity: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- Brownish-tan matrix with a white central band
- Luster
- Dull to vitreous
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Physical properties
Hardness: 7 on Mohs scale; Color: Brownish-tan matrix with a white central band; Luster: Dull to vitreous; Structure: Granular/Crystalline; Specific Gravity: 2.6-2.7
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone under heat and pressure. The white band is a hydrothermal vein formed when silica-rich fluids filled a fracture in the original rock and crystallized.
Uses & applications
Primarily used as decorative landscaping stone, river rock, or as a collector's specimen for teaching basic geology.
Geological facts
The white band is often called a 'wishing line' in folklore. Quartzite is one of the most durable rocks on Earth's surface and resistant to chemical weathering.
Field identification & locations
Identified by its ability to scratch glass and the distinct contrast between the host rock and the quartz vein. Commonly found in riverbeds and glacial tills.
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