metamorphic
Quartzite with Pyrite Inclusions
Metamorphic Quartz-rich Rock
Hardness of 7 on the Mohs scale, varying colors of grey, white, and yellowish brown with metallic pyrite specks, vitreous to greasy luster, massive crystal structure, no good cleavage, specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, varying colors of grey, white, and yellowish brown with metallic pyrite specks, vitreous to greasy luster, massive crystal structure, no good cleavage, specific gravity around 2.65.
Formation & geological history
Formed through the metamorphism of quartz sandstone or chert under high heat and pressure, often found in mountain-building belts.
Uses & applications
Used in construction, road aggregate, manufacturing of silica brick, and sometimes as a decorative stone.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, which is why quartz-rich rocks often survive as pebbles and boulders long after other minerals have eroded away.
Field identification & locations
Can be identified by its hardness (will scratch glass easily) and lack of reactivity to acid. Found worldwide in regions with ancient mountain building events.
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