metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white to gray or brown in color, vitreous to greasy luster, massive crystal structure with no distinct cleavage, and a specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically white to gray or brown in color, vitreous to greasy luster, massive crystal structure with no distinct cleavage, and a specific gravity around 2.65.
Formation & geological history
Formed when quartz-rich sandstone or chert is subjected to high heat and pressure through regional or contact metamorphism, often over hundreds of millions of years.
Uses & applications
Used extensively in construction as crushed stone for roadbeds, railway ballast, and dimension stone, as well as in manufacturing refractories and decorative tiles.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, which is why mountain ridges formed of quartzite often stand out as high, resistant peaks.
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 globally in ancient mountain belts.
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