metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white to gray or yellowish-brown, vitreous to greasy luster, non-foliated crystal structure with conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically white to gray or yellowish-brown, vitreous to greasy luster, non-foliated crystal structure with conchoidal fracture.
Formation & geological history
Formed under intense heat and pressure from quartz-rich sandstone during regional or contact metamorphism, often over millions of years.
Uses & applications
Used widely in construction, decorative aggregates, railroad ballast, and manufacture of silica brick.
Geological facts
Quartzite is extremely durable and weathering-resistant, frequently forming prominent ridges and resistant mountain peaks.
Field identification & locations
Identified by its inability to be scratched by steel and its granular sugar-like texture on broken surfaces; found globally in ancient orogenic belts.
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