mineral

White quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky quartz

AI-generated identification · may be incorrect

Opaque to translucent off-white, with a dull to glassy luster and no visible cleavage; quartz has a trigonal crystal structure, Mohs hardness 7, and specific gravity about 2.65. The rounded shape and smooth surface suggest it has been water-worn or tumbled.

Identified September 25, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly forms when silica-rich fluids crystallize in veins and cavities, or in igneous and metamorphic rocks; it is highly resistant to weathering and can persist in river and beach gravels. The specimen’s age and exact source cannot be determined from the image.

Uses & applications

Quartz is used in glassmaking, electronics, abrasives, and decorative stone; attractive pieces may be polished or used in jewelry.

Geological facts

Quartz is one of Earth’s most abundant minerals and occurs in many colors and forms.

Field identification & locations

Look for hardness (it scratches glass), lack of cleavage, and a white streak; rounded pebbles commonly occur in stream, beach, and gravel deposits worldwide. The photo does not reveal a diagnostic locality or confirm whether it is natural or tumbled.