metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, white to gray color, vitreous to greasy luster, non-foliated massive crystal structure, and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, white to gray color, vitreous to greasy luster, non-foliated massive crystal structure, and conchoidal fracture.
Formation & geological history
Formed under high heat and pressure from quartz-rich sandstone during regional or contact metamorphism.
Uses & applications
Used widely in construction, railroad ballast, decorative aggregates, and occasionally as a gemstone.
Geological facts
Quartzite is extremely resistant to weathering, which is why ridges formed of quartzite often remain as prominent hills.
Field identification & locations
Can be identified by its inability to be scratched by steel and its refusal to effervesce with acid; commonly found globally in mountain-building belts.
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