metamorphic
Quartzite pebble
Quartzite, composed predominantly of quartz (SiO₂)
AI-generated identification · may be incorrectPale gray to whitish, granular and slightly sparkly with a matte-to-glassy luster; quartz hardness is 7 Mohs, with no cleavage and an interlocking crystalline texture. The rounded shape and smooth surface suggest natural water-worn or tumbled wear.
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Physical properties
Pale gray to whitish, granular and slightly sparkly with a matte-to-glassy luster; quartz hardness is 7 Mohs, with no cleavage and an interlocking crystalline texture. The rounded shape and smooth surface suggest natural water-worn or tumbled wear.
Formation & geological history
Forms when quartz-rich sandstone is recrystallized by heat and pressure, welding its grains together; quartzites range from ancient Precambrian to much younger geological ages.
Uses & applications
Used as crushed stone, paving and building material, and decorative landscaping stone; this small pebble has mainly educational or decorative value.
Geological facts
Quartzite is generally harder and more resistant to weathering than its sandstone precursor.
Field identification & locations
Look for hard, interlocking quartz grains and a lack of visible layering; it commonly occurs in metamorphic terrains and river or beach gravels. The photograph alone cannot confirm the identification or precise origin.
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