metamorphic
Quartzite
Metamorphic Quartz Arenite
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, vitreous luster, conchoidal fracture, and composed primarily of interlocking quartz crystals.
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Physical properties
Hardness of 7 on the Mohs scale, vitreous luster, conchoidal fracture, and composed primarily of interlocking quartz crystals.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, often occurring in mountain-building belts.
Uses & applications
Used in construction, road aggregates, decorative landscaping, and manufacturing refractory bricks and ferrosilicon.
Geological facts
Quartzite is extremely resistant to weathering, which explains why mountain ridges capped with quartzite often form prominent peaks.
Field identification & locations
Identified by its hard, non-foliated texture and the fact that it will scratch glass and not fizz with hydrochloric acid; found globally.
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