metamorphic
White quartzite pebble (tentative)
Quartzite; predominantly microcrystalline quartz (SiO₂)
AI-generated identification · may be incorrectWhite to off-white, smooth and rounded, with a matte to weakly vitreous luster; Mohs hardness about 7, no cleavage, conchoidal to irregular fracture, and specific gravity near 2.65. The image alone cannot exclude milky quartz or a ceramic-like non-geological object.
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Physical properties
White to off-white, smooth and rounded, with a matte to weakly vitreous luster; Mohs hardness about 7, no cleavage, conchoidal to irregular fracture, and specific gravity near 2.65. The image alone cannot exclude milky quartz or a ceramic-like non-geological object.
Formation & geological history
Quartzite forms when quartz-rich sandstone is recrystallized under heat and pressure during metamorphism, generally from Precambrian to younger geological settings. Rounded edges indicate water or wave abrasion, or deliberate tumbling/polishing.
Uses & applications
Used as aggregate, road stone, building and decorative stone; attractive pieces may be used in landscaping, crafts, and low-cost gemstone collections.
Geological facts
Quartzite is harder and more resistant than its sandstone precursor and typically scratches glass. A true specimen should show granular quartz texture rather than uniform plastic-like smoothness.
Field identification & locations
Common in metamorphic mountain belts and river or beach gravels worldwide; test with a steel file or glass scratch test, though testing may damage it. Acid produces no reaction.
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