mineral

Quartz pebble / River stone

SiO2 (Silicon Dioxide)

Hardness: 7, Color: white to milky, Luster: vitreous to dull if weathered, Crystal structure: trigonal (though massive here), Cleavage: none, Specific gravity: 2.65

Identified May 31, 2026More mineral →

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Physical properties

Hardness: 7, Color: white to milky, Luster: vitreous to dull if weathered, Crystal structure: trigonal (though massive here), Cleavage: none, Specific gravity: 2.65

Formation & geological history

Formed from igneous or metamorphic processes, subsequently weathered, transported by water, and smoothed into a pebble over time.

Uses & applications

Landscaping, decorative stone, sometimes used in aggregate or as an abrasive.

Geological facts

Quartz is one of the most abundant minerals on Earth's surface. The smooth shape indicates significant transport by water, such as a river or wave action.

Field identification & locations

Identify by its hardness (scratches glass), lack of cleavage, and typical milky white color. Found commonly in riverbeds, beaches, and glacial deposits.