metamorphic

Quartzite with Iron Staining

Metamorphic Quartzite (SiO2)

AI-generated identification · may be incorrect

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.

Identified August 6, 2026More metamorphic →

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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.