metamorphic
Quartzite with Iron Staining
Metamorphic Quartzite (SiO2)
Hardness of 7 on the Mohs scale, vitreous to greasy luster, white to light gray base color with brown and orange iron oxide staining, conchoidal fracture, and compact granular crystal structure.
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Physical properties
Hardness of 7 on the Mohs scale, vitreous to greasy luster, white to light gray base color with brown and orange iron oxide staining, conchoidal fracture, and compact granular crystal structure.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under high temperatures and tectonic pressure, typically during mountain-building events over millions of years.
Uses & applications
Used in construction, as crushed stone for roads, dimension stone for architecture, decorative landscaping, and occasionally lapidary arts.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, which is why ridges formed of quartzite often survive as prominent hills or mountain crests.
Field identification & locations
Identified by its high hardness (scratches glass easily), inability to be scratched by a knife, lack of effervescence with acid, and the fused quartz grains visible under magnification. Common worldwide in metamorphic belts.
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