mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

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

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

Identified March 28, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: White to translucent; 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 fluids in veins or as a late-stage mineral in igneous pegmatites. It can be found in rocks of all geological ages, from Precambrian to recent times.

Uses & applications

Used industrially as an abrasive, in glass making, and as a source of silicon for electronics. In construction, it is used as decorative stone. It is also common in jewelry as cabochons and for metaphysical collecting.

Geological facts

The milky white appearance is caused by tiny inclusions of gas or liquid trapped during the crystal's growth. It is the most common variety of crystalline quartz found on the Earth's surface.

Field identification & locations

Identify in the field by its hardness (it can scratch glass), lack of cleavage, and white 'milky' opacity. It is commonly found in gravel beds, mountain ranges, and within quartz veins. Collectors should look for sharp crystal faces or interesting host rock attachments.