metamorphic
Quartzite
Quartzite
AI-generated identification · may be incorrectHardness: 7 (Mohs scale), Color: Gray to white, Luster: Vitreous to dull, Crystal structure: Massive (granular), Cleavage: None, Specific gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: Gray to white, Luster: Vitreous to dull, Crystal structure: Massive (granular), Cleavage: None, Specific gravity: 2.65
Formation & geological history
Formed by the metamorphism of pure quartz sandstone through heating and pressure usually related to tectonic compression within orogenic belts.
Uses & applications
Used in construction for flooring, wall covering, and roofing. Also used as railway ballast and in the production of silica for the glass industry.
Geological facts
Quartzite is highly resistant to chemical weathering and often forms ridges and resistant hilltops. The interlacing quartz grains make it very hard and difficult to break.
Field identification & locations
Identified by its granular texture, extreme hardness (scratches glass), and sugary appearance on broken surfaces. Found worldwide in areas of regional metamorphism.
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