mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale), Color: Colorless to milky white, Luster: Vitreous/Waxy, Crystal Structure: Trigonal/Hexagonal (though water-worn), Cleavage: None/Conchoidal fracture, Specific Gravity: 2.65

Identified May 28, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale), Color: Colorless to milky white, Luster: Vitreous/Waxy, Crystal Structure: Trigonal/Hexagonal (though water-worn), Cleavage: None/Conchoidal fracture, Specific Gravity: 2.65

Formation & geological history

Formed through the crystallization of magma or from hydrothermal veins. This specific specimen has been weathered and rounded by water transport in a river or beach environment.

Uses & applications

Used in glassmaking, electronics (piezoelectric properties), abrasives, and as decorative gravel or landscaping stone.

Geological facts

Quartz is one of the most abundant minerals in Earth's continental crust and is highly resistant to chemical and physical weathering, which is why it often remains as pebbles after other minerals have eroded.

Field identification & locations

Identify by its ability to scratch glass and its lack of cleavage. Commonly found in riverbeds, beaches, and soil. Collectors look for clarity or smooth textures.