metamorphic
Quartzite Pebble
Metamorphic rock predominantly composed of Quartz (SiO2)
Hardness: 7 on Mohs scale; Color: White to light grey; Luster: Vitreous to waxy; Structure: Granofelsic; Cleavage: None; Specific Gravity: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- White to light grey
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: White to light grey; Luster: Vitreous to waxy; Structure: Granofelsic; Cleavage: None; Specific Gravity: 2.6-2.7
Formation & geological history
Formed through the metamorphism of quartz sandstone under intense heat and pressure, typically in orogenic belts. This smooth shape indicates fluvial or glacial transport.
Uses & applications
Used in construction as road ballast, in glass manufacturing (if high purity), and in landscaping or decorative gravel.
Geological facts
Quartzite is one of the most durable and weather-resistant rocks on Earth's surface. It can be harder than the steel blade of a knife.
Field identification & locations
Identify by its hardness (will scratch glass) and lack of reaction to acid. Often found in riverbeds, glacial tills, and beaches.
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