mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Identified May 27, 2026More mineral →

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Physical properties

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

Formation & geological history

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

Uses & applications

Used as an abrasive, in glass making, as a gemstone (decorative), and in electronics for its piezoelectric properties. Common in landscaping and high-end construction.

Geological facts

Milky quartz is the most common variety of crystalline quartz. It can sometimes contain minute amounts of gold trapped within the crystal structure in hydrothermal veins.

Field identification & locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and characteristic waxy or milky appearance. It is ubiquitous in mountainous areas and riverbeds.