metamorphic
Quartzite Pebble
Metamorphosed Quartz (SiO2)
Hardness: 7 on Mohs scale; Color: Creamy white to pale tan/orange; Luster: Vitreous to waxy; Structure: Granular/Crystalline; No cleavage; Specific gravity: approx. 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Creamy white to pale tan/orange
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Creamy white to pale tan/orange; Luster: Vitreous to waxy; Structure: Granular/Crystalline; No cleavage; Specific gravity: approx. 2.65.
Formation & geological history
Formed from the metamorphism of quartz sandstone under high heat and pressure, where original quartz grains recrystallize into a dense interlocking map of crystals. This specimen has been rounded by fluvial or beach erosion.
Uses & applications
Industrial use in glassmaking and abrasives; construction as crushed stone or decorative gravel; tumbled specimens are used in lapidary and for pocket stones.
Geological facts
Quartzite is one of the most durable rocks on Earth's surface. It can be harder than the steel blade of a knife and is highly resistant to chemical weathering.
Field identification & locations
Identify by its hardness (it will scratch glass) and lack of reaction to acid. Commonly found in riverbeds, beaches, and glacial till. This specimen shows characteristic rounded 'river rock' smoothing.
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