metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically gray, white, 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 gray, white, 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 tectonic pressure, commonly occurring over millions of years.
Uses & applications
Used extensively in construction, railroad ballast, manufacturing of silica bricks, and decorative landscaping or countertops.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, often forming prominent ridges and mountain peaks.
Field identification & locations
Identify by its inability to be scratched by a steel knife and lack of fizzing with hydrochloric acid; found globally in ancient orogenic belts.
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