metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
AI-generated identification · may be incorrectHardness of 7 on Mohs scale, white to gray or pinkish color, vitreous luster, non-foliated massive crystal structure, specific gravity around 2.65.
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Physical properties
Hardness of 7 on Mohs scale, white to gray or pinkish color, vitreous luster, non-foliated massive crystal structure, specific gravity around 2.65.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, often occurring in mountain-building belts.
Uses & applications
Used primarily in construction for crushed stone, railroad ballast, and building facings, as well as manufacturing refractory bricks and silica.
Geological facts
Quartzite is extremely durable and weather-resistant, often forming prominent mountain ridges because it erodes much slower than surrounding rocks.
Field identification & locations
Identify by its ability to scratch glass and the fact that it breaks across quartz grains rather than around them. Found globally in ancient orogenic belts.
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