metamorphic
Quartzite
Metamorphic Quartz Rock
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, color ranges from white and gray to pink or reddish due to iron oxides, vitrified or sugary luster, conchoidal fracture
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Physical properties
Hardness of 7 on the Mohs scale, color ranges from white and gray to pink or reddish due to iron oxides, vitrified or sugary luster, conchoidal fracture
Formation & geological history
Formed from quartz-rich sandstone subjected to high heat and pressure, typically during tectonic mountain-building events over millions of years
Uses & applications
Used in construction, as crushed stone for roadbeds, railway ballast, and occasionally as a decorative building stone or for countertops
Geological facts
Extremely durable and resistant to chemical weathering, which is why quartzite ridges often form prominent mountain crests and hills
Field identification & locations
Can be distinguished from sandstone by breaking across rather than around the quartz grains; found globally in ancient orogenic belts
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