metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically brown or tan, vitreous to greasy luster, non-foliated massive crystal structure, and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically brown or tan, vitreous to greasy luster, non-foliated massive crystal structure, and conchoidal fracture.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and tectonic pressure, typically taking millions of years.
Uses & applications
Used in construction, decorative aggregates, wall cladding, and crushed stone for road bases.
Geological facts
Quartzite is extremely resistant to weathering and often forms prominent ridge lines in mountainous landscapes.
Field identification & locations
Identify by its inability to be scratched by steel and lack of effervescence with acid; found globally in ancient orogenic belts.
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