mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

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

Identified February 27, 2026More mineral →

Explore Milky Quartz in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

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

Formation & geological history

Formed through the cooling of silica-rich magma or precipitation from hydrothermal veins. The white color is caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth. They are found in almost all geological environments and ages.

Uses & applications

Used in the glass industry, as an abrasive, in the production of silicon, and as a semi-precious gemstone in jewelry (cabochons or beads). It is also used as a decorative stone in landscaping and construction aggregates.

Geological facts

Milky Quartz is the most common variety of crystalline quartz. While most clear quartz is prized, high-quality milky quartz with a 'snow-like' appearance is used in spiritual practices and for carving large ornamental objects.

Field identification & locations

Identify in the field by its hardness (it can scratch glass), lack of cleavage, and characteristic 'waxy' or 'milky' white appearance. It is found globally, particularly in pegmatites and quartz veins.