Milky Quartz

Physical Properties

Hardness: 7 (Mohs scale); Color: White to cloudy translucent; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (Trigonal); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Formation & Geological History

Commonly forms in hydrothermal veins, pegmatites, and as a primary mineral in igneous rocks like granite. Its cloudy appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Uses & Applications

Used as an abrasive, in the production of glass and ceramics, as a source for silicon in electronics, and in decorative items, landscaping, and jewelry.

Geological Facts

Milky quartz is the most common variety of crystalline quartz. It is often found in large, massive beds and is a significant component of quartz veins that frequently host gold deposits.

Field Identification & Locations

Identify by its hardness (scratches glass), lack of cleavage, and characteristic cloudy/milky transparency. It is found globally, with significant deposits in Brazil, the USA (Arkansas), and the Alps.

Identified on: 5/19/2026

Mode: Standard