mineral

Milky quartz pebble

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Mostly translucent to milky white with a vitreous-to-dull luster and irregular fractures; hardness 7 Mohs, trigonal crystal structure, no cleavage, and specific gravity about 2.65. The rounded shape and surface wear indicate a water-worn pebble; a yellowish patch may be staining or attached material.

Identified October 4, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich magma and hydrothermal fluids, and also occurs in veins within older rocks. This pebble was likely rounded by transport in a river or along a shore; its precise geological age cannot be determined from the image.

Uses & applications

Quartz is used in glassmaking, electronics, and industrial abrasives; attractive pieces are collected or used decoratively.

Geological facts

Quartz is among Earth’s most abundant minerals and resists weathering, allowing it to persist as rounded stream and beach pebbles.

Field identification & locations

Look for glassy fracture surfaces, lack of cleavage, and hardness sufficient to scratch ordinary glass. Milky quartz occurs worldwide, commonly in veins and river gravels.