metamorphic
Pink Quartzite
Quartzite (primarily SiO2)
Hardness: 7 on Mohs scale; Color: Pink to reddish-orange; Luster: Vitreous to dull; Crystal structure: Trigonal (granular texture); Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.7
- 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 (granular texture); Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.7
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone. High heat and pressure cause quartz grains to recrystallize and fuse together, often in orogenic belts. Its pink color is typically due to trace amounts of iron oxide (hematite).
Uses & applications
Used as decorative stone in landscaping, crushed stone for road construction, railway ballast, and occasionally in jewelry as tumbled stones or lapidary pieces.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rocks during erosion, forming ridges and mountain peaks. It is frequently mistaken for marble, but can be distinguished by its superior hardness.
Field identification & locations
Identify in the field by its granular, sugary texture and extreme hardness (it will easily scratch glass). Found globally in metamorphic terranes such as the Appalachians or the Great Lakes region.
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