Milky Quartz

Physical Properties

Hardness: 7 Mohs; Color: White to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Formation & Geological History

Formed in hydrothermal veins and pegmatites. The white color is caused by tiny liquid or gas inclusions trapped during crystal growth. Can be millions to billions of years old.

Uses & Applications

Used in glass making, abrasive manufacturing, electronics (due to piezoelectric properties), and as decorative stones in jewelry and landscaping.

Geological Facts

Milkiness is often caused by micro-cavities containing fluids that were present during the mineral's formation. It is the most common variety of crystalline quartz.

Field Identification & Locations

Identify by its hardness (scratches glass), lack of cleavage, and white cloudy appearance. Common worldwide, especially in mountain ranges and riverbeds.

Identified on: 5/2/2026

Mode: Standard