metamorphic
Pink Quartzite
Quartzite (SiO2) with inclusions
Hardness: 7 on Mohs scale; Color: pale pink to rose with greyish-green inclusions; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None/Conchoidal fracture; Specific gravity: 2.63–2.65.
- Hardness
- 7 on Mohs scale
- Color
- pale pink to rose with greyish-green inclusions
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: pale pink to rose with greyish-green inclusions; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None/Conchoidal fracture; Specific gravity: 2.63–2.65.
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone under intense heat and pressure. The pink hue often results from minute amounts of hematite or iron impurities, while green streaks may indicate epidote or chlorite.
Uses & applications
Used in construction for road ballast and decorative stones, as a source of silica in glassmaking and metallurgy, and as ornamental stone for gardening or lapidary collection.
Geological facts
Quartzite is so tough that it usually breaks through the quartz grains rather than along their boundaries. It is often mistake for marble, but its hardness allows it to scratch glass easily.
Field identification & locations
Identify in the field by its extreme hardness (cannot be scratched by steel) and lack of reaction to acid. Often found in glaciated areas or old mountain belts where tectonic pressures were high.
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