metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
Hardness of 7 on the Mohs scale, colors range from white and gray to pink or purple, vitreous to greasy luster, massive crystal structure with interlocking quartz grains, conchoidal fracture, specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, colors range from white and gray to pink or purple, vitreous to greasy luster, massive crystal structure with interlocking quartz grains, conchoidal fracture, specific gravity around 2.65.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone or chert under high heat and tectonic pressure, typically during mountain-building events over millions of years.
Uses & applications
Used widely in construction, as crushed stone for road bases, in railroad ballast, and increasingly as durable kitchen countertops and decorative building stone.
Geological facts
Quartzite is extremely resistant to chemical weathering and erosion, which is why ridges formed of quartzite often stand out as prominent mountain peaks.
Field identification & locations
Can be identified in the field by its hardness (scratches glass easily), lack of reaction to acid, and the sugary texture of interlocking quartz crystals visible on fractured surfaces. Common worldwide.
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