metamorphic
Quartzite
Metamorphic Quartzite
Hardness of 7 on the Mohs scale, color typically white to gray or pinkish, vitreous to greasy luster, non-foliated crystal structure, lacks prominent cleavage, specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, color typically white to gray or pinkish, vitreous to greasy luster, non-foliated crystal structure, lacks prominent cleavage, specific gravity around 2.65.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under high temperatures and tectonic pressures, often during mountain-building events.
Uses & applications
Used in construction, as crushed stone for roadbeds, decorative landscaping, wall tiles, and countertops.
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 in the field by its sugary texture and the way it breaks across the quartz grains rather than around them, unlike sandstone.
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