metamorphic
Quartzite
Metamorphic Quartz Arenite
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, vitreous to dull luster, and typically white, grey, or reddish due to iron impurities. It features an interlocking crystalline structure with no visible cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, vitreous to dull luster, and typically white, grey, or reddish due to iron impurities. It features an interlocking crystalline structure with no visible cleavage.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and tectonic pressure, typically during mountain-building events over millions of years.
Uses & applications
Used extensively in construction as crushed stone for roadbeds, dimension stone for architecture, and in the manufacturing of refractory bricks and silica.
Geological facts
Quartzite is exceptionally resistant to weathering and erosion, which is why quartz-rich ridges often form prominent mountain crests. Famous occurrences include Quartzite Mountain in Montana.
Field identification & locations
Identify it in the field by its sugary texture, inability to be scratched by a knife, and the way it fractures across rather than around the quartz grains. Common globally in ancient orogenic belts.
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