mineral

Milky Quartz

Silicon Dioxide (SiO2)

Mohs hardness of 7; Color: White to translucent; Luster: Vitreous (glassy) to greasy; Crystal system: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.

Color: White to translucent
Luster: Vitreous (glassy) to greasy

Identified May 10, 2026More mineral →

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Physical properties

Mohs hardness of 7; Color: White to translucent; Luster: Vitreous (glassy) to greasy; Crystal system: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.

Formation & geological history

Formed in hydrothermal veins, pegmatites, and as a primary constituent of igneous rocks like granite. Its cloudy appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glass manufacturing, electronics (piezoelectric properties), abrasives, as decorative stone in landscaping, and in jewelry/crystal collecting.

Geological facts

Milky quartz is one of the most common varieties of crystalline quartz on Earth. Its white color is often due to microscopic fluid inclusions that have been trapped since the crystal was formed.

Field identification & locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and white milky appearance. It is found globally in almost every geological environment.