metamorphic
Quartzite Pebble
Metamorphic Quartzite
Hardness of 7 on the Mohs scale, colors ranging from grey to brown and white, 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 ranging from grey to brown and white, vitreous to greasy luster, massive crystal structure with interlocking quartz grains, conchoidal fracture, specific gravity around 2.65.
Formation & geological history
Formed when quartz-rich sandstone is subjected to high heat and pressure, typically through tectonic compression during mountain-building events, over millions of years.
Uses & applications
Used in construction, as road aggregate, railroad ballast, and sometimes carved or tumbled as decorative stones.
Geological facts
Quartzite is extremely resistant to weathering and erosion, which is why quartz-rich rocks often survive long journeys in riverbeds to become rounded pebbles.
Field identification & locations
Found worldwide in stream beds, beaches, and ancient metamorphic terrains. Easily identified by its extreme hardness (scratches glass easily) and the sugary texture of interlocking quartz crystals visible on broken surfaces.
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