metamorphic
Quartzite Pebble
Metamorphic rock primarily composed of Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale); Color: White to off-white/cream; Luster: Vitreous to dull/waxy; Texture: Smooth, water-worn surface; Cleavage: None (conchoidal fracture).
- Hardness
- 7 (Mohs scale)
- Color
- White to off-white/cream
- Luster
- Vitreous to dull/waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: White to off-white/cream; Luster: Vitreous to dull/waxy; Texture: Smooth, water-worn surface; Cleavage: None (conchoidal fracture).
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone. High heat and pressure Recrystallize the quartz grains into a dense, interlocking matrix. This specific specimen was likely smoothed by fluvial or coastal erosion.
Uses & applications
Used in landscaping, construction aggregate, and as a durable abrasive; also popular as 'worry stones' or for decorative garden paths.
Geological facts
Quartzite is one of the most durable and weather-resistant rocks on the Earth's surface. It can be harder than the steel blade of a knife.
Field identification & locations
Identify by its hardness (it will scratch glass) and lack of reaction to acid. Commonly found in riverbeds, glacial deposits, and mountain ranges where ancient sea beds were uplifted.
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