mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

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

Identified March 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal solutions or cooling of igneous magma. Its white color is caused by tiny fluid inclusions of gas or liquid trapped during crystal growth. They can range from Precambrian to modern ages.

Uses & applications

Used widely in construction and glassmaking. In lapidary, it is used for beads, cabochons, and decorative carvings. It is also used as a source of silicon for electronic components and solar panels.

Geological facts

Milky Quartz is the most common variety of crystalline quartz. Historically, it was used by many indigenous cultures to create stone tools and arrowheads. It is often found in the 'root' of vein systems near gold deposits.

Field identification & locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and characteristic 'cloudy' white appearance. It is found globally in igneous and metamorphic terrains, specifically in quartz veins within granite or schist. Collectors often find it along riverbeds and mountain trails.