metamorphic
Pink Quartzite
Quartzite (mostly SiO2 with Iron Oxide impurities)
Hardness: 7 on Mohs scale; Color: Pink to reddish-orange; Luster: Vitreous to dull; Crystal structure: Trigonal/Hexagonal (granular texture); Cleavage: None; Specific gravity: 2.63-2.65
- Hardness
- 7 on Mohs scale
- Color
- Pink to reddish-orange
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: Pink to reddish-orange; Luster: Vitreous to dull; Crystal structure: Trigonal/Hexagonal (granular texture); Cleavage: None; Specific gravity: 2.63-2.65
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone under intense heat and pressure. The pink color comes from small amounts of hematite or other iron oxides during formation.
Uses & applications
Used in construction for road ballast, flooring, and wall coverings. Smooth pebbles are popular for landscaping, aquarium decor, and lapidary tumbling.
Geological facts
Quartzite is so tough that it often survives intense weathering that destroys other rocks, resulting in smoothed river stones like the one pictured. It is harder than a steel knife and will scratch glass easily.
Field identification & locations
Identify by its sugary, granular texture and extreme hardness. Commonly found in areas with ancient mountain belts or as rounded river cobbles in glaciated regions.
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