metamorphic
White quartzite pebble
Quartzite; predominantly microcrystalline quartz (SiO₂)
AI-generated identification · may be incorrectHardness about 7 Mohs; white to pale gray, with a matte-to-waxy surface and no visible cleavage. It is a dense, fine-grained aggregate of interlocking quartz crystals; exact identification is limited by the smooth, possibly tumbled surface.
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Physical properties
Hardness about 7 Mohs; white to pale gray, with a matte-to-waxy surface and no visible cleavage. It is a dense, fine-grained aggregate of interlocking quartz crystals; exact identification is limited by the smooth, possibly tumbled surface.
Formation & geological history
Forms when quartz-rich sandstone is recrystallized during metamorphism, commonly during mountain building; ages range from Precambrian to recent depending on its source. The rounded shape indicates abrasion in a river, beach, or tumbler.
Uses & applications
Used as crushed stone, aggregate, paving and decorative landscaping material; attractive pieces may be polished or used in crafts, but this specimen has little gem value.
Geological facts
Quartzite commonly scratches ordinary glass and resists weathering better than sandstone. Its white color reflects high quartz purity and low abundance of iron-bearing minerals.
Field identification & locations
Look for a sugary or fused quartz texture, strong glass-scratching ability, and lack of fizz in dilute acid; sandstone usually shows distinct sand grains and may crumble more easily. Common in quartzite terrains and alluvial beaches or river gravels.
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