metamorphic
Quartzite
Metamorphic Quartzite
Hardness of 7 on the Mohs scale, colors typically range from white and gray to pink, brown, or yellow, vitreous to greasy luster, non-foliated massive crystal structure, specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, colors typically range from white and gray to pink, brown, or yellow, vitreous to greasy luster, non-foliated massive crystal structure, specific gravity around 2.65.
Formation & geological history
Formed when quartz-rich sandstone is subjected to high heat and pressure, typically through tectonic compression in orogenic belts.
Uses & applications
Used in construction, as crushed stone for roadbeds, building facades, decorative aggregate, and in the manufacturing of silica bricks.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, which is why ridges formed of quartzite often persist as prominent hills or mountain crests.
Field identification & locations
Can be identified in the field by its high hardness (scratches glass easily), sugary texture on fractured surfaces, and lack of reaction to hydrochloric acid. Found worldwide in ancient mountain ranges.
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