Milky Quartz

Physical Properties

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

Formation & Geological History

Formed from silica-rich hydrothermal solutions or within igneous pegmatites as magma cools. Milky quartz gets its appearance from millions of microscopic fluid inclusions of gas or liquid trapped during crystal growth.

Uses & Applications

Used as an abrasive in sandpaper, in glassmaking, as a component of concrete and mortar, and as a decorative stone in landscaping and jewelry (as cabochons).

Geological Facts

Milky quartz is the most common variety of crystalline quartz. It can often be found in gold-bearing veins, leading prospectors to associate white quartz outcrops with potential gold deposits.

Field Identification & Locations

Identify by its ability to scratch glass and lack of cleavage. It is found globally in mountain ranges, alluvial deposits, and desert pavements.

Identified on: 5/5/2026

Mode: Standard