metamorphic
Quartzite
Quartzite (primarily SiO2)
Hardness: 7 (Mohs scale); Color: White to grey/tan; Luster: Vitreous to dull; Crystal structure: Trigonal (granular); Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.7
- Hardness
- 7 (Mohs scale)
- Color
- White to grey/tan
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 (Mohs scale); Color: White to grey/tan; Luster: Vitreous to dull; Crystal structure: Trigonal (granular); Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.7
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, typically during tectonic plate collisions. Geological age can range from Precambrian to Cenozoic.
Uses & applications
Used as a decorative stone in landscaping, used in road construction, and as a source of silica for glass manufacturing and electronics.
Geological facts
Quartzite is so hard and chemically resistant that it often forms the ridges and peaks of mountain ranges because it resists weathering better than surrounding rocks.
Field identification & locations
Identify in the field by its ability to scratch glass and its granular, sugary texture. It is commonly found in mountain belts and areas of ancient crustal uplift.
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