Milky Quartz

Physical Properties

Hardness: 7 on Mohs scale; Color: Cloudy white to pale gray; Luster: Vitreous to greasy; Crystal Structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Formation & Geological History

Formed from silica-rich hydrothermal solutions or as a cooling byproduct in igneous and metamorphic environments. Its white color comes from microscopic fluid inclusions trapped during crystal growth.

Uses & Applications

Used in the production of glass, ceramics, and abrasives. Used in electronics for its piezoelectric properties and as a common gemstone or landscaping stone.

Geological Facts

Milky quartz is the most common variety of crystalline quartz. The white cloudiness is caused by tiny bubbles of gas or liquid trapped within the crystal when it formed millions of years ago.

Field Identification & Locations

Identify by its ability to scratch glass, its white 'milky' appearance, and the lack of cleavage or flat peeling. It is a very common find in gravel beds, mountain streams, and quartz veins.

Identified on: 4/16/2026

Mode: Standard