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 a non-foliated, granular 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 a non-foliated, granular crystal structure.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and tectonic pressure, typically over hundreds of millions of years.
Uses & applications
Used extensively in construction, aggregate, railway ballast, and decorative countertops due to its extreme durability.
Geological facts
Quartzite is harder than the original sandstone it formed from and will fracture across quartz grains rather than around them.
Field identification & locations
Identify by its non-reactivity to acid, sugary texture on broken surfaces, and ability to scratch glass easily; found worldwide in mountainous or ancient craton regions.
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