Milky Quartz

Physical Properties

Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & Geological History

Formed from silica-rich hydrothermal fluids in veins or as a late-stage mineral in cooling igneous magmas. Found in almost all geological environments and ages.

Uses & Applications

Used in glass manufacturing, electronics (due to piezoelectric properties), construction aggregates, and as a semi-precious gemstone in jewelry or decorative carvings.

Geological Facts

The milky color is caused by tiny fluid inclusions of gas and/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 (will scratch glass), lack of cleavage, and white cloudy appearance. Common globally in mountain ranges and riverbeds.

Identified on: 5/16/2026

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