mineral

White quartz pebble (likely milky quartz)

Quartz, SiO₂; identification from the photo is provisional

AI-generated identification · may be incorrect

Opaque white, rounded and smooth with a dull-to-waxy surface; quartz has Mohs hardness 7, a trigonal crystal structure, no cleavage, and specific gravity about 2.65. The pebble’s shape suggests natural water or beach abrasion.

Identified September 27, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly crystallizes from silica-rich fluids in igneous and metamorphic rocks, then becomes a durable pebble through weathering and transport; its exact age and source cannot be determined from the image.

Uses & applications

Quartz is widely used in glassmaking, ceramics, electronics, and construction; attractive pieces may be polished or collected.

Geological facts

Quartz is one of Earth’s most abundant minerals and resists weathering, so it often accumulates in stream and beach gravels.

Field identification & locations

A white, hard pebble that can scratch ordinary glass and lacks obvious cleavage is consistent with quartz; similar-looking white stones can include marble or quartzite. Common worldwide in river, beach, and glacial deposits.