metamorphic
Quartzite Pebble
Quartzite (SiO2)
Hardness 7 on Mohs scale, dull to sub-vitreous luster, microcrystalline structure, smooth water-worn texture, pale greyish-pink color with thin white quartz veinlets.
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Physical properties
Hardness 7 on Mohs scale, dull to sub-vitreous luster, microcrystalline structure, smooth water-worn texture, pale greyish-pink color with thin white quartz veinlets.
Formation & geological history
Formed from the regional or contact metamorphism of quartz sandstones under high temperature and pressure, recrystallizing the quartz grains. Frequently smoothed into beach or river pebbles by aqueous erosion.
Uses & applications
Used primarily as decorative gravel, in landscaping, aquarium decoration, and as aggregate material in heavy construction.
Geological facts
Quartzite pebbles are extremely durable and resistant to chemical weathering. Water-worn quartzite stones are among the most common rounded pebbles found on riverbeds and ocean beaches worldwide.
Field identification & locations
Identify in the field by its high hardness (scratches glass easily) and interlocking granular texture that does not rub off. Found in gravel pits, river beds, and coastal beach shores.
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