metamorphic
Quartziteite (Pink Quartzite)
Quartzite (composed primarily of Quartz, SiO2)
Hardness: 7 on Mohs scale; Color: Pinkish-red to tan; Luster: Vitreous to waxy; Structure: Non-foliated, granular; Cleavage: None (conchoidal fracture)
- Hardness
- 7 on Mohs scale
- Color
- Pinkish-red to tan
- Luster
- Vitreous to waxy
Identified More metamorphic →
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Physical properties
Hardness: 7 on Mohs scale; Color: Pinkish-red to tan; Luster: Vitreous to waxy; Structure: Non-foliated, granular; Cleavage: None (conchoidal fracture)
Formation & geological history
Formed from the metamorphism of quartz sandstone under high heat and pressure. The pink color is usually due to iron oxide impurities. Found in ancient mountain belts and glacial till.
Uses & applications
Used in construction as crushed stone, for road ballast, as decorative landscaping stone, and occasionally in glassmaking if pure enough.
Geological facts
Quartzite is so tough that it often outlasts surrounding rocks, forming high ridges and resistant hills. It is harder than steel and will easily scratch glass.
Field identification & locations
Identify by its extreme hardness and smooth, water-worn texture if found in riverbeds or beaches. Unlike sandstone, it will not crumble into grains when struck.
