Milky Quartz

Physical Properties

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

Formation & Geological History

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

Uses & Applications

Used in the glassmaking industry, as an abrasive, in electronics for its piezoelectric properties, and widely in jewelry, home decor, and spiritual practices.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of crystalline quartz found in nature.

Field Identification & Locations

Identify in the field by its ability to scratch glass and steel, its cloudy white color, and its lack of cleavage planes. It often occurs in veins throughout other rock types.

Identified on: 4/23/2026

Mode: Standard