Milky Quartz

Physical Properties

Hardness: 7 on Mohs scale; Color: Milky white to opaque white; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.

Formation & Geological History

Formed from silicon-rich hydrothermal veins or through the cooling of silica-saturated magma. Often found in pegmatites and metamorphic environments worldwide.

Uses & Applications

Used in glass manufacturing, electronics (piezoelectric properties), abrasives, and as decorative stone or landscaping material. Low-grade specimens are used in road construction.

Geological Facts

The milky white appearance is caused by tiny fluid inclusions of gas or liquid trapped during crystal growth. It is the most common variety of crystalline quartz.

Field Identification & Locations

Identify in the field by its hardness (scratches glass), lack of cleavage, and white color. It is extremely common and found in almost all geological environments.

Identified on: 4/30/2026

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