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 and non-foliated massive crystal structure.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, gray, or pinkish with a vitreous to greasy luster and non-foliated massive crystal structure.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, typically over hundreds of millions of years.
Uses & applications
Used extensively in construction, railway ballast, dimension stone, and occasionally for decorative landscaping or countertops.
Geological facts
Quartzite is extremely durable and weather-resistant, often forming prominent mountain ridges because it erodes much slower than surrounding rocks.
Field identification & locations
Identified by its inability to be scratched by a steel knife and its tendency to fracture across quartz grains rather than around them; found worldwide.
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