Milky Quartz

Physical Properties

Hardness: 7 on Mohs scale; Color: Milky white to translucent blue-gray; Luster: Vitreous to greasy; Crystal Structure: Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Formation & Geological History

Forms through the crystallization of silica-rich hydrothermal solutions or cooling magma in veins. The milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Uses & Applications

Used in glass manufacturing, electronics (piezoelectric properties), abrasives, and as decorative stone or landscaping material.

Geological Facts

Milky quartz is the most common variety of crystalline quartz. It is often found in large massive forms rather than distinct crystals. Massive veins of quartz are often associated with gold deposits.

Field Identification & Locations

Identify by its hardness (scratches glass), lack of cleavage, and characteristic translucent white appearance. Found globally in pegmatites and metamorphic veins.

Identified on: 4/20/2026

Mode: Standard