metamorphic
Red Quartzite
Quartzite (SiO2)
Hardness of 7 on the Mohs scale, reddish-brown color due to iron oxide impurities, vitreous to greasy luster, non-foliated massive crystal structure, conchoidal fracture, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, reddish-brown color due to iron oxide impurities, vitreous to greasy luster, non-foliated massive crystal structure, conchoidal fracture, specific gravity of 2.65.
Formation & geological history
Formed from quartz-rich sandstone subjected to high heat and pressure during regional metamorphism, often during mountain-building events over millions of years.
Uses & applications
Used in construction, as crushed stone for road building, decorative landscaping, and occasionally as a gemstone or for making countertops.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, which is why quartz sandstone ridges often form prominent mountain crests after surrounding softer rocks erode away.
Field identification & locations
Identified by its inability to be scratched by steel, lack of reaction to acid, and sugary texture on fractured surfaces. Found worldwide in ancient orogenic belts.
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