metamorphic
Pink Quartzite
Metamorphosed Quartz Arenite (SiO2)
Hardness: 7 on Mohs scale; Color: Pink to reddish-pink due to iron oxide inclusions; Luster: Vitreous to dull; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- Pink to reddish-pink due to iron oxide inclusions
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: Pink to reddish-pink due to iron oxide inclusions; Luster: Vitreous to dull; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.6-2.7
Formation & geological history
Quartzite is formed when quartz-rich sandstone is subjected to high heat and pressure during regional metamorphism. The sand grains recrystallize and fuse together into a dense, interlocking mosaic of quartz crystals. Pink varieties often date back to the Proterozoic era.
Uses & applications
Used as a crushed stone for road construction and railway ballast. Polished slabs are used for countertops, floor tiles, and decorative wall cladding. Fine specimens are used in landscaping or as lapidary material.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rocks during weathering, forming prominent ridges and peaks. It is harder and more durable than the sandstone it originated from.
Field identification & locations
Identifiable in the field by its grainy, 'sugar-like' texture that does not rub off, and its ability to scratch glass. Widely found in the Appalachian Mountains, Lake Superior region, and Brazil.
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