metamorphic
Quartzite
Quartzite
AI-generated identification · may be incorrectHardness 7, typically white to light grey, but can be red, pink, or purple due to iron oxide impurities. Vitreous to granular luster.
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Physical properties
Hardness 7, typically white to light grey, but can be red, pink, or purple due to iron oxide impurities. Vitreous to granular luster.
Formation & geological history
Formed by the metamorphism of pure quartz sandstone under high heat and pressure.
Uses & applications
Used in construction, flooring, roofing, and decorative stone. Sometimes used as railroad ballast.
Geological facts
Because quartzite is so hard, it is highly resistant to weathering and often forms ridges and hilltops.
Field identification & locations
Identified by its granular, sugary texture and high hardness (scratches glass). Commonly found in mountain ranges worldwide.
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