mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: Cloudy white to opaque; Luster: Vitreous (glassy) to greasy; Crystal Structure: Trigonal (hexagonal prisms); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

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

Identified March 9, 2026More mineral →

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Physical properties

Formation & geological history

Formed from the crystallization of silica-rich magma or via hydrothermal activity in veins. The 'milky' appearance is caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth. They are found in geological formations ranging from the Precambrian to recent times.

Uses & applications

Used in glassmaking, abrasives, and as a component in concrete. In jewelry, it is used for cabochons, beads, and decorative carvings. It also has historical use in stone tools.

Geological facts

Milky Quartz is the most common variety of crystalline quartz. Historically, it was sometimes mistaken for white jade. It is the primary mineral in quartz veins which often serve as hosts for gold deposits.

Field identification & locations

Identify in the field by its hardness (will scratch glass), cloudy white appearance, and lack of cleavage. It is found globally, particularly in mountain ranges with igneous or metamorphic basements. For collectors, look for specimens with large crystal faces or those containing gold veins.