metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
AI-generated identification · may be incorrectMohs hardness of 7; typically white, gray, or pinkish; vitreous to greasy luster; non-foliated massive crystal structure.
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Physical properties
Mohs hardness of 7; typically white, gray, or pinkish; vitreous to greasy luster; non-foliated massive crystal structure.
Formation & geological history
Formed through the thermal or regional metamorphism of quartz-rich sandstone, typically during mountain-building events over millions of years.
Uses & applications
Used extensively in construction, railway ballast, decorative aggregates, and occasionally as a dimension stone for countertops.
Geological facts
Quartzite is extremely resistant to weathering and erosion, often forming prominent ridge lines and mountain peaks.
Field identification & locations
Identified in the field by its hardness (scratches glass easily) and the fused quartz grains that break across, rather than around, the grains.
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