metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on Mohs scale, typically gray or white color with a vitreous to greasy luster, massive crystal structure with interlocking quartz grains and no cleavage, specific gravity around 2.65.
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Physical properties
Hardness of 7 on Mohs scale, typically gray or white color with a vitreous to greasy luster, massive crystal structure with interlocking quartz grains and no cleavage, specific gravity around 2.65.
Formation & geological history
Formed from quartz-rich sandstone subjected to high heat and pressure during tectonic metamorphism over millions of years.
Uses & applications
Used in construction as crushed stone, railway ballast, dimension stone, and occasionally in decorative applications or countertops.
Geological facts
Extremely resistant to weathering and chemical erosion, which allows it to form prominent ridges and resistant mountain peaks.
Field identification & locations
Identified by its inability to be scratched by a steel knife, lack of effervescence with acid, and sugary textured fractured surfaces. Found worldwide in ancient mountain belts.
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