metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white, gray, or pinkish with a vitreous to greasy luster, massive crystal structure, and lacks distinct cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, gray, or pinkish with a vitreous to greasy luster, massive crystal structure, and lacks distinct cleavage.
Formation & geological history
Formed through the thermal or regional metamorphism of quartz-rich sandstone under intense heat and pressure over millions of years.
Uses & applications
Widely used in construction for road aggregates, railway ballast, and dimension stone, as well as in countertops and decorative tiles.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, often forming prominent mountain ridges because it erodes slower than surrounding rocks.
Field identification & locations
Identify in the field by its sugary texture on broken surfaces and its ability to scratch glass easily without reacting to hydrochloric acid.
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