mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale), Color: White/Milky to translucent, Luster: Vitreous to dull, Crystal Structure: Hexagonal (though not visible in tumbled form), Cleavage: None/Conchoidal fracture, Specific Gravity: 2.65

Identified June 8, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the cooling of magma or precipitation from hydrothermal veins. This specifically is a water-worn pebble, shaped by erosion in a river or coastal environment over thousands of years.

Uses & applications

Commonly used in landscaping, construction aggregate, and glass manufacturing. High-purity quartz is used in electronics and watches. Pebbles like this are often kept as pocket stones or used in aquariums.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'quarz', which means 'hard'. Clear varieties have been used in various cultures as 'healing stones' throughout history.

Field identification & locations

Identify by its hardness (it can scratch glass and steel) and lack of cleavage. Commonly found on beaches, riverbeds, and in gravel pits worldwide. Collectors look for unique shapes or clarity.