mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous 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 to greasy

Identified July 19, 2026More mineral →

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Physical properties

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

Formation & geological history

Forms from the cooling of magma or by precipitation from hydrothermal veins. The white color is caused by tiny fluid inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glass making, ceramics, as an abrasive, in the electronics industry for its piezoelectric properties, and as a decorative stone in landscaping or jewelry.

Geological facts

Milky quartz is the most common variety of crystalline quartz. It is often found in large veins that can span several meters across and can contain gold or other precious metals.

Field identification & locations

Identify by its hardness (scratches glass), lack of cleavage, and white 'cloudy' appearance. It is found globally in igneous, metamorphic, and sedimentary environments.