Milky Quartz

Physical Properties

Hardness: 7 on Mohs scale; Color: 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 cooling of silica-rich magma or from hydrothermal veins. The milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Uses & Applications

Used in glass manufacturing, electronics (due to piezoelectric properties), construction as an aggregate, and for decorative landscaping or minor jewelry.

Geological Facts

Milky quartz is the most common variety of crystalline quartz. It can often be found associated with gold in hydrothermal vein deposits, making it a key indicator for prospectors.

Field Identification & Locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and white opaque color. It is omnipresent globally in various geological terrains.

Identified on: 5/4/2026

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