metamorphic
Quartzite
Metamorphic Quartzite
Hardness of 7 on the Mohs scale, colors range from white and gray to pink or brown, vitreous to greasy luster, interlocking crystalline structure, lacks cleavage, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, colors range from white and gray to pink or brown, vitreous to greasy luster, interlocking crystalline structure, lacks cleavage, specific gravity of 2.65.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under high temperatures and pressures, typically in mountain-building belts, dating from various geological eras.
Uses & applications
Used as crushed stone in construction, railroad ballast, decorative aggregates, and occasionally for countertops and monuments.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, which is why quartz-rich sandstone ridges often form prominent mountain crests.
Field identification & locations
Identified by its hard, scratch-resistant surface (will easily scratch glass) and lack of visible individual sand grains due to recrystallization. Found globally in ancient orogenic belts.
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