metamorphic
Pink Quartzite
Quartzite (principally SiO2)
Hardness: 7 on Mohs scale; Color: Pink to reddish; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- Pink to reddish
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: Pink to reddish; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.6-2.7
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone under intense heat and pressure, often during mountain-building events. The pink color is usually due to traces of iron oxide (hematite).
Uses & applications
Used as decorative stone, crushed stone for road construction, railway ballast, and occasionally in jewelry as tumbled stones or cabochons.
Geological facts
Quartzite is so tough that it often survives erosion better than the rocks around it, leading to the formation of ridges and hilltops. It is one of the most physically durable and chemically resistant rocks found at the Earth's surface.
Field identification & locations
Identified in the field by its inability to be scratched by a steel knife and its sugary texture on broken surfaces. It lacks the 'waxy' look of chalcedony. Found globally in ancient metamorphic belts.
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