metamorphic
Quartzite Pebble
Metamorphic Quartzite (SiO2)
Hardness of 7 on the Mohs scale, pale beige to light pinkish color, dull to waxy luster, non-foliated granoblastic texture, smooth rounded shape from erosion.
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Physical properties
Hardness of 7 on the Mohs scale, pale beige to light pinkish color, dull to waxy luster, non-foliated granoblastic texture, smooth rounded shape from erosion.
Formation & geological history
Formed from the recrystallization of quartz-rich sandstone under intense heat and pressure during regional metamorphism, subsequently eroded and rounded by water transport in rivers or ocean shores.
Uses & applications
Used widely in decorative landscaping, pebble collections, construction aggregate, and as a polishing medium in rock tumblers.
Geological facts
Quartzite is exceptionally tough and resistant to chemical weathering, which is why it often survives as smooth beach or river pebbles long after softer surrounding rocks have eroded away.
Field identification & locations
Identified by its high hardness (scratches glass easily), interlocking quartz grains, and smooth rounded pebble morphology. Commonly found along riverbeds, beaches, and glacial deposits worldwide.
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