metamorphic
Quartzite Pebble
Metamorphic rock predominantly composed of Quartz (SiO2)
Hardness: 7 (Mohs scale), Color: Creamy white to pale gray, Luster: Waxy to vitreous when wet, Structure: Granular crystalline, Cleavage: None (conchoidal fracture), Specific Gravity: 2.6-2.7
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Physical properties
Hardness: 7 (Mohs scale), Color: Creamy white to pale gray, Luster: Waxy to vitreous when wet, Structure: Granular crystalline, Cleavage: None (conchoidal fracture), Specific Gravity: 2.6-2.7
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone. It originated through heat and pressure within the Earth's crust which fused sand grains together. This specific pebble has been smoothed by fluvial or coastal water erosion.
Uses & applications
Mainly used in construction as crushed stone, in glass manufacturing due to high silica content, and as decorative river stones in landscaping.
Geological facts
Quartzite is so tough that it often breaks through the quartz grains rather than along their boundaries, unlike sandstone. It is resistant to chemical weathering and creates prominent ridges in many mountain ranges.
Field identification & locations
Identify by its hardness (it will easily scratch glass) and lack of reaction to acid. Commonly found in riverbeds, glacial deposits, and beaches. Look for a smooth, matte finish that appears slightly translucent at the edges.
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