Milky Quartz

Physical Properties

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

Formation & Geological History

Formed through the crystallization of silica-rich hydrothermal solutions or magma. Milky quartz gets its cloudiness from tiny fluid inclusions of gas or liquid trapped during crystal growth.

Uses & Applications

Used in glassmaking, abrasives, silicon production for electronics, and as decorative gravel or landscaping stone. Lower-grade specimens are common for beginner collectors.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. It is piezo-electric, meaning it generates an electric charge when mechanical pressure is applied, which is why it is used in watches.

Field Identification & Locations

Identify in the field by its inability to be scratched by a steel knife (it will scratch glass instead) and its characteristic lack of cleavage. Look for a greasy feel and glassy sheen on fresh breaks.

Identified on: 4/13/2026

Mode: Standard