metamorphic
Quartzite Pebble
Quartzite (SiO2)
Hardness: 7 (Mohs scale); Color: Creamy white to off-white; Luster: Dull to waxy; Texture: Granular, sugary appearance; Non-foliated metamorphic rock.
- Hardness
- 7 (Mohs scale)
- Color
- Creamy white to off-white
- Luster
- Dull to waxy
Identified More metamorphic →
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Physical properties
Hardness: 7 (Mohs scale); Color: Creamy white to off-white; Luster: Dull to waxy; Texture: Granular, sugary appearance; Non-foliated metamorphic rock.
Formation & geological history
Formed when quartz-rich sandstone is subjected to high heat and pressure, causing the original quartz grains to recrystallize into a dense interlaced structure.
Uses & applications
Used in construction as a decorative aggregate, in landscaping, and formerly as a raw material for toolmaking; sometimes used as a worry stone.
Geological facts
Quartzite is extremely resistant to chemical weathering and creates prominent ridges in mountain ranges. It is often harder and tougher than the parent rock, sandstone.
Field identification & locations
Commonly found in riverbeds and on beaches as smooth, water-worn pebbles. Identified by its ability to scratch glass and its lack of reaction to acid.
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