mineral

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: Translucent white to milky cloudy; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Translucent white to milky cloudy
Luster: Vitreous to waxy

Identified June 28, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Translucent white to milky cloudy; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Formation & geological history

Formed from silica-rich hydrothermal fluids or as a primary constituent in igneous rocks like granite. This specific specimen is river-worn or beach-tumbled, resulting in its smooth, rounded Shape. It can be from any geological age, ranging from millions to billions of years old.

Uses & applications

Used in glass making, abrasive materials, electronics (due to piezoelectric properties), and as decorative landscaping stone or collectibles.

Geological facts

Milky quartz gets its white, cloudy appearance from tiny microscopic inclusions of gas or liquid trapped during the crystal's growth. It is the most common variety of crystalline quartz.

Field identification & locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and translucent nature. Commonly found in riverbeds, beaches, and glacial till. Watch for the 'conchoidal fracture' where chips have been taken out.