metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white to gray or pink, vitreous luster, non-foliated dense crystal structure, conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically white to gray or pink, vitreous luster, non-foliated dense crystal structure, conchoidal fracture.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and tectonic pressure, typically over hundreds of millions of years.
Uses & applications
Used in construction, railroad ballast, dimension stone, and manufactured countertops due to extreme durability.
Geological facts
Quartzite is so durable that weathering often leaves it forming prominent ridge lines in mountainous terrain.
Field identification & locations
Identify by its hardness (scratches glass easily) and lack of reaction to acid; found globally in mountainous or ancient cratonic regions.
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