Milky Quartz

Physical Properties

Hardness: 7 on Mohs scale; Color: White to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal (hexagonal prisms); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & Geological History

Forms in hydrothermal veins, pegmatites, and as a common constituent in many igneous, metamorphic, and sedimentary rocks. Milky quartz gets its color from tiny fluid inclusions of gas or liquid trapped during crystal growth.

Uses & Applications

Used in glassmaking, as an abrasive, in the production of silicon wafers for electronics, as landscaping stone, and as a spiritual or decorative collector's item.

Geological Facts

Milky quartz is the most common variety of crystalline quartz. It is often found in large 'veins' that can span across entire mountainsides and is the primary host rock for gold in many mining districts.

Field Identification & Locations

Identify by its ability to scratch glass, its white opaque appearance, and the lack of cleavage (it breaks in irregular, shell-like curves). It is found globally and is abundant in mountainous regions.

Identified on: 4/17/2026

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