mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Cloudy white to milky white; Luster: Vitreous to greasy; Crystal structure: Hexagonal/Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Cloudy white to milky white
Luster: Vitreous to greasy

Identified May 15, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Cloudy white to milky white; Luster: Vitreous to greasy; Crystal structure: Hexagonal/Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal fluids in veins or as a late-stage mineral in igneous pegmatites. It is found in a wide variety of geological environments ranging from Precambrian to Cenozoic ages.

Uses & applications

Used in the production of glass, ceramics, and abrasives. Also used as a decorative stone in landscaping, jewelry, and for metaphysical purposes.

Geological facts

The milky or cloudy appearance is caused by tiny fluid inclusions of gas and/or liquid trapped during crystal growth. It is one of the most common varieties of crystalline quartz on Earth.

Field identification & locations

Identified by its white color, extreme hardness (it will easily scratch glass), and lack of cleavage. It is found globally in mountain ranges and gravel pits.