metamorphic
Quartzite
Quartzite (SiO2)
Hardness: 7 on Mohs scale; Color: White to light grey; Luster: Vitreous to dull; Crystal structure: Trigonal/Hexagonal system in granular masses; Cleavage: None; Specific Gravity: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- White to light grey
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: White to light grey; Luster: Vitreous to dull; Crystal structure: Trigonal/Hexagonal system in granular masses; Cleavage: None; Specific Gravity: 2.6-2.7
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone under intense heat and pressure, typically in orogenic belts (mountain-building areas).
Uses & applications
Used in construction as crushed stone or decorative facing, in the glass industry as a source of silica, and as garden stones for landscaping.
Geological facts
Quartzite is so hard that it can scratch steel and even glass. It is often confused with marble, but unlike marble, it will not fizz when exposed to acid.
Field identification & locations
Identify in the field by its sugary, granular texture and extreme hardness. Commonly found in folded mountain ranges across the world.
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