mineral
Milky quartz pebble
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectWhite to gray, opaque and dull-to-vitreous; Mohs hardness 7, trigonal crystal structure, no cleavage, and specific gravity about 2.65. The rounded shape and rusty stains suggest a naturally weathered pebble.
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Physical properties
White to gray, opaque and dull-to-vitreous; Mohs hardness 7, trigonal crystal structure, no cleavage, and specific gravity about 2.65. The rounded shape and rusty stains suggest a naturally weathered pebble.
Formation & geological history
Likely quartz from quartz-rich rock, later released by weathering and rounded during transport in water or sediment. Quartz forms in many geological settings and occurs across a wide range of ages.
Uses & applications
Quartz is used in glassmaking, abrasives, electronics, and decorative stone; this small pebble is mainly a collecting specimen.
Geological facts
Quartz is one of Earth’s most abundant minerals and resists weathering, allowing it to accumulate in river and beach gravels.
Field identification & locations
A white, hard pebble that scratches glass and lacks obvious cleavage is consistent with quartz; the photo alone cannot confirm the identification. Quartz is widespread worldwide, especially in veins and quartz-rich gravels.
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