metamorphic
Pink Quartzite
Quartzite (primarily SiO2)
Hardness: 7 on Mohs scale. Color: Light pink to reddish-buff. Luster: Vitreous to waxy. Crystal structure: Hexagonal/Trigonal (microcrystalline). Cleavage: None (conchoidal fracture). Specific Gravity: 2.6-2.7.
- Hardness
- 7 on Mohs scale
- Color
- Light pink to reddish-buff
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale. Color: Light pink to reddish-buff. Luster: Vitreous to waxy. Crystal structure: Hexagonal/Trigonal (microcrystalline). Cleavage: None (conchoidal fracture). Specific Gravity: 2.6-2.7.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone. Under intense heat and pressure, original quartz grains recrystallize and fuse together. The pink color is often due to iron oxide inclusions.
Uses & applications
Used as crushed stone for road construction, railway ballast, and as a decorative stone in landscaping. High-quality pieces are used for architectural tiling and dimension stone.
Geological facts
Quartzite is so tough and durable that it often remains as ridges or peaks after surrounding softer rocks have eroded away. It is significantly harder than the sandstone it originates from.
Field identification & locations
Identify by its ability to scratch glass and its granular, sugary texture on fresh breaks. Unlike marble, it will not fizz when exposed to acid. Commonly found in folded mountain belts globally.
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