mineral

Milky quartz pebble

Quartz (SiO₂), commonly called milky quartz

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous to waxy luster; hardness 7 Mohs, hexagonal crystal structure, no cleavage, conchoidal fracture, and specific gravity about 2.65. The rounded shape indicates natural abrasion or tumbling.

Identified August 12, 2026More mineral →

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Physical properties

Formation & geological history

Forms when microscopic fluid inclusions, fractures, or impurities cloud quartz, commonly in hydrothermal veins, pegmatites, and quartz-rich igneous or metamorphic rocks. Quartz is abundant from Precambrian to modern geological settings.

Uses & applications

Used for ornamental stone, countertops, carvings, aggregate, and silica products; attractive translucent pieces are collected but are generally inexpensive.

Geological facts

Quartz is one of Earth’s most abundant minerals and is resistant to weathering, allowing it to persist as rounded stream or beach pebbles.

Field identification & locations

Identify it by its glassy appearance, lack of cleavage, hardness sufficient to scratch ordinary glass, and white translucent interior; common worldwide in veins, stream gravels, and glacial deposits.