metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on Mohs scale, vitreous luster, ranging in color from white to gray, pink, or purple with interlocking quartz crystals.
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Physical properties
Hardness of 7 on Mohs scale, vitreous luster, ranging in color from white to gray, pink, or purple with interlocking quartz crystals.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure over millions of years.
Uses & applications
Used in construction, railroad ballast, decorative aggregates, and occasionally for countertops and monument building.
Geological facts
Quartzite is extremely resistant to weathering and erosion, often forming prominent mountain ridges. It breaks across quartz grains rather than around them.
Field identification & locations
Identify by its hardness (scratches glass) and lack of reactivity to acid. Commonly found worldwide in ancient mountain belts.
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