metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white to gray or pink, vitreous to greasy luster, non-foliated massive structure, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically white to gray or pink, vitreous to greasy luster, non-foliated massive structure, specific gravity of 2.65.
Formation & geological history
Formed through the thermal metamorphism of quartz-rich sandstone under intense heat and pressure, commonly over hundreds of millions of years.
Uses & applications
Used in construction as crushed stone for road bases, railroad ballast, dimension stone, and manufactured countertops.
Geological facts
Quartzite is extremely resistant to chemical weathering and erosion, which is why ancient mountain ranges often weather into quartzite ridges.
Field identification & locations
Identify by its ability to scratch glass and lack of acid reaction; it does not break around the quartz grains like sandstone but shatters right through them.
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