metamorphic
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
Hardness of 7 on the Mohs scale, grayish-pink to purplish color, vitreous to dull 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, grayish-pink to purplish color, vitreous to dull luster, massive crystal structure with interlocking quartz grains, conchoidal fracture, specific gravity around 2.65.
Formation & geological history
Formed from quartz-rich sandstone subjected to high heat and pressure during tectonic processes, typically regional metamorphism, over millions of years.
Uses & applications
Used in landscaping, construction aggregate, decorative stone, and occasionally for making glass or refractory materials.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, which is why quartz-rich rocks often survive as rounded pebbles in rivers and beaches long after other rocks have eroded away.
Field identification & locations
Found globally in ancient mountain belts and riverbeds. Identified by its extreme hardness (scratches glass easily), inability to effervesce with acid, and sugary textured broken surface.
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