mineral

Milky Quartz Pebble

Quartz (Silicon Dioxide - SiO2)

Hardness: 7 (Mohs scale); Color: White to translucent creamy white; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 (Mohs scale)
Color: White to translucent creamy white
Luster: Vitreous to waxy

Identified March 31, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: White to translucent creamy white; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed through the cooling of molten magma or the precipitation of hydrothermal fluids in veins. Milky quartz specifically gets its appearance from tiny fluid inclusions of gas or liquid trapped during crystal growth. This specimen appears water-worn, indicating it was shaped by alluvial (river) or coastal erosion.

Uses & applications

Used in glassmaking, abrasives, and as a source for silicon in electronics. In rounded pebble form, it is commonly used for landscaping, aquarium gravel, and as a tactile stone for collectors or spiritual practices.

Geological facts

Milky quartz is the most common variety of crystalline quartz. While it lacks the clarity of rock crystal, the 'milkiness' is actually a microscopic record of the geological environment at the time of its formation millions of years ago.

Field identification & locations

Identify in the field by its inability to be scratched by a steel knife, its lack of cleavage, and its translucent white color. Found globally in riverbeds, beaches, and eroded mountain terrains. It is a common 'seeker' stone for beginning rockhounds.

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