mineral

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous (glassy) to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Opaque white to translucent
Luster: Vitreous (glassy) to greasy

Identified March 27, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous (glassy) to greasy; Crystal Structure: Trigonal/Hexagonal; 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. It can be found in a wide variety of geological ages and environments, often associated with gold-bearing veins.

Uses & applications

Used in the production of glass, ceramics, and abrasives. In construction, it is used as an aggregate. It is also used for landscaping, as a gemstone (vugular or massive), and it is a common specimen for beginner mineral collectors.

Geological facts

Milky quartz is the most common variety of crystalline quartz. Historically, it was often mistaken for 'ice that never melts' by ancient civilizations. It is also the primary source of 'bull quartz' found in massive veins and is frequently an indicator mineral for prospectors looking for gold.

Field identification & locations

Identify in the field by its distinct white color, lack of cleavage, and ability to scratch glass easily (Hardness 7). Look for it in pegmatites, river beds, or as large exposed veins in mountainous terrain. Specimens are abundant worldwide, particularly in Brazil, the USA, and the Alps.