Milky Quartz

Physical Properties

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

Formation & Geological History

Formed in hydrothermal veins and pegmatites by the cooling of silica-rich solutions in the Earth's crust. It can occur in almost any geological age.

Uses & Applications

Used in glassmaking, abrasives, electronics (piezoelectric properties), and as decorative landscape stone or gemstones.

Geological Facts

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

Field Identification & Locations

Identify by its hardness (scratches glass), lack of cleavage, and white opaque color. Commonly found in mountain ranges and riverbeds globally.

Identified on: 5/19/2026

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