mineral
White pebble, likely milky quartz
Quartz (SiO₂), probable; identification is uncertain from the image alone
AI-generated identification · may be incorrectOpaque white, rounded pebble with a dull to slightly glassy surface. Quartz has Mohs hardness 7, a trigonal crystal structure, no cleavage, and uneven to conchoidal fracture; specific gravity is about 2.65.
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Physical properties
Opaque white, rounded pebble with a dull to slightly glassy surface. Quartz has Mohs hardness 7, a trigonal crystal structure, no cleavage, and uneven to conchoidal fracture; specific gravity is about 2.65.
Formation & geological history
If quartz, it formed as silica crystallized in igneous or hydrothermal settings, then weathered and became rounded by transport. Quartz occurs in rocks of many ages; the pebble’s age and source cannot be determined visually.
Uses & applications
Quartz is used in glass, electronics, abrasives, and jewelry; this small pebble is chiefly decorative or collectible.
Geological facts
Milky appearance usually results from microscopic fluid inclusions or fractures that scatter light.
Field identification & locations
The pictured object is a small white rounded stone on a cork mat. A hardness or streak test could help distinguish quartz from softer white minerals such as calcite; common sources include river gravels and quartz veins.
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