metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white, gray, or pinkish with a vitreous to greasy luster, and a non-foliated, granular crystal structure.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, gray, or pinkish with a vitreous to greasy luster, and a non-foliated, granular crystal structure.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, typically over hundreds of millions of years in mountain-building zones.
Uses & applications
Used widely in construction as crushed stone, dimension stone for architecture, and as decorative aggregate or kitchen countertops.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, often forming prominent mountain ridges because it erodes much slower than surrounding rocks.
Field identification & locations
Easily identified in the field by its hardness (scratches glass) and the sugary texture of interlocking quartz crystals that does not fizz with acid.
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