metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white to grey with reddish-brown iron staining, vitreous luster, and a non-foliated massive crystal structure.
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Physical properties
Hardness of 7 on the Mohs scale, typically white to grey with reddish-brown iron staining, vitreous luster, and a non-foliated massive crystal structure.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under high heat and pressure, typically during mountain-building events.
Uses & applications
Used extensively in construction as crushed stone, railway ballast, dimension stone, and for manufacturing silica brick.
Geological facts
Because quartz is extremely resistant to weathering, quartzite ridges often form prominent, highly durable mountain crests.
Field identification & locations
Identified by its scratch resistance to steel, lack of reaction to acid, and sugary textured fractured surface; found globally in ancient orogenic belts.
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