metamorphic
Quartzite
Metamorphic Quartz Sandstone (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically yellow to orange due to iron oxide impurities, vitreous luster, and a non-foliated massive crystal structure with conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically yellow to orange due to iron oxide impurities, vitreous luster, and a non-foliated massive crystal structure with conchoidal fracture.
Formation & geological history
Formed through the thermal or regional metamorphism of quartz-rich sandstone under intense heat and pressure over millions of years.
Uses & applications
Used primarily in construction for crushed stone, railroad ballast, and decorative facing, as well as in the manufacturing of silica bricks.
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
Can be identified by testing its hardness against steel and observing that it fractures across the individual quartz grains rather than around them.
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