metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, vitreous luster, conchoidal fracture, and compact granular crystal structure with specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, vitreous luster, conchoidal fracture, and compact granular crystal structure with specific gravity around 2.65.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, typically during mountain-building tectonic events.
Uses & applications
Used in construction, as crushed stone for roads, for railroad ballast, and occasionally as a decorative facing stone or countertop material.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, often forming prominent mountain ridges because it erodes slower than surrounding rocks.
Field identification & locations
Identify in the field by its sugary texture, inability to be scratched by a steel knife, and lack of fizzing with hydrochloric acid. Found worldwide.
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