mineral

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous to waxy (when water-worn); Crystal Structure: Hexagonal (Trigonal); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Opaque white to translucent
Luster: Vitreous to waxy (when water-worn)

Identified July 18, 2026More mineral →

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Physical properties

Formation & geological history

Formed from silica-rich hydrothermal solutions or as a primary constituent in igneous rocks like granite. This specific specimen has been rounded and smoothed by water erosion (fluvial or beach action).

Uses & applications

Commonly used as decorative landscaping stones, aquarium gravel, in the manufacture of glass and ceramics, and as a minor gemstone for tumbling or lapidary work.

Geological facts

The 'milky' appearance is caused by tiny fluid inclusions of gas or liquid trapped during crystal growth. It is one of the most abundant minerals on Earth's crust.

Field identification & locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and translucent white appearance. It is found globally in riverbeds, beaches, and mountain outcrops.