Milky Quartz

Physical Properties

Hardness: 7 on Mohs scale; Color: Cloudy white to pale yellow; Luster: Vitreous to greasy; Crystal Structure: Hexagonal/Trigonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Formation & Geological History

Formed through the crystallization of silica-rich hydrothermal fluids in veins or pegmatites. The cloudy appearance is caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth.

Uses & Applications

Used in the production of glass and ceramics, as an abrasive, in electronics for its piezoelectric properties, and widely as a decorative stone or tumbled gemstone in jewelry.

Geological Facts

Milky quartz is the most common variety of crystalline quartz found on Earth. It is often found in gold-bearing quartz veins, serving as an indicator for prospectors.

Field Identification & Locations

Identify by its hardness (scratches glass), lack of cleavage, and characteristic waxy-milk appearance. It is found globally, particularly in mountainous regions and riverbeds as water-worn pebbles.

Identified on: 5/10/2026

Mode: Standard