mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

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

Hardness: 7 on Mohs scale
Color: Cloudly white to opaque cream
Luster: Vitreous to greasy

Identified March 28, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Cloudly white to opaque cream; Luster: Vitreous 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. Can be found in geological environments ranging from billions of years old to relatively recent volcanic systems.

Uses & applications

Used as an abrasive in sandblasting, in glassmaking, as a component in concrete and mortar, and for landscaping. In jewelry, it is used for cabochons or beads, and it is highly popular among metaphysical collectors and rockhounds.

Geological facts

Milky quartz is the most common variety of crystalline quartz. Historically, it was used by many ancient cultures for stone tools. It is also a primary indicator mineral for gold, as gold is often deposited in milky quartz veins via hydrothermal fluids.

Field identification & locations

Identify in the field by its hardness (it will scratch glass), its white 'cloudy' opacity, and lack of cleavage. Often found as outcroppings in mountainous regions or as rounded pebbles in stream beds. Collectors should look for unique crystalline shapes or associated gold mineralization.