mineral

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Hardness: 7 (Mohs scale); Color: White to translucent pinkish-orange; Luster: Vitreous to greasy; Crystal structure: Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.

Hardness: 7 (Mohs scale)
Color: White to translucent pinkish-orange
Luster: Vitreous to greasy

Identified March 25, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: White to translucent pinkish-orange; Luster: Vitreous to greasy; Crystal structure: Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal solutions or within igneous pegmatites. The milky white opacity is caused by microscopic inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Commonly used as an abrasive, in glass manufacturing, as a decorative stone in landscaping, and occasionally in jewelry as cabochons. It is also a major source of silicon for semiconductor and solar industries.

Geological facts

Milky Quartz is the most common variety of crystalline quartz. While often overlooked for clearer varieties, large masses can form entire mountain ridges due to its high resistance to weathering.

Field identification & locations

Identify in the field by its ability to scratch glass and steel, its lack of cleavage planes, and its characteristic 'greasy' feel on weathered surfaces. It is found globally in almost all geological environments.