metamorphic
Quartzite
Metamorphic Quartzite
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, reddish-brown color due to iron oxide impurities, vitreous luster, and non-foliated granular crystal structure.
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Physical properties
Hardness of 7 on the Mohs scale, reddish-brown color due to iron oxide impurities, vitreous luster, and non-foliated granular crystal structure.
Formation & geological history
Formed from quartz-rich sandstone subjected to intense heat and pressure during tectonic compression over millions of years.
Uses & applications
Used primarily in construction, decorative landscaping, railroad ballast, and occasionally for manufactured dimension stone or countertops.
Geological facts
Quartzite is extremely durable and weather-resistant, which is why parent sand grains completely recrystallize into an interlocking mosaic.
Field identification & locations
Easily identified by its hardness (scratches glass) and sugary texture on fractured surfaces; found globally in mountainous or ancient craton regions.
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