mineral

Tumbled milky quartz pebble

Quartz (SiO₂), likely milky quartz

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent with a vitreous-to-waxy luster and massive, non-crystalline appearance. Quartz has hexagonal crystal structure and no cleavage, but this specimen is rounded and polished/tumbled.

Identified September 22, 2026More mineral →

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Physical properties

Formation & geological history

Forms when microscopic fluid inclusions, fractures, or impurities cloud quartz during hydrothermal or igneous processes; quartz is common from Precambrian to modern deposits. Its rounded shape indicates natural abrasion or human tumbling.

Uses & applications

Used as a low-cost lapidary, craft, landscaping, and decorative stone; occasionally made into beads or cabochons. Common tumbled pieces are mainly ornamental rather than high-value gems.

Geological facts

Milky quartz is one of Earth’s most abundant mineral varieties and can weather into durable stream pebbles. The faint pink or beige areas may reflect iron staining or other inclusions.

Field identification & locations

Identify by its glassy sheen, lack of visible cleavage, white translucency, and ability to scratch ordinary glass; it should not fizz in dilute acid. Common worldwide, especially in quartz veins, pegmatites, and river gravels.