metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically brown or tan with a vitreous to greasy luster, massive crystal structure, and lacks cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, typically brown or tan with a vitreous to greasy luster, massive crystal structure, and lacks cleavage.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, often during mountain-building events over millions of years.
Uses & applications
Used primarily in construction for road aggregate, railroad ballast, and decorative building stone, as well as in the manufacture of silica brick.
Geological facts
Quartzite is exceptionally resistant to weathering, which is why parent sandstone ridges often weather out as prominent resistant mountain crests.
Field identification & locations
Identify it 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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