mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: White to cloudy translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal (often massive in this form); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 (Mohs scale)
Color: White to cloudy translucent
Luster: Vitreous to greasy

Identified March 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed from the crystallization of silica-rich hydrothermal fluids in veins or as a late-stage mineral in igneous pegmatites. It can occur in geological formations ranging from Precambrian to recent times.

Uses & applications

Used in the production of glass, ceramics, and silicon chips; also used as an abrasive, in decorative landscaping, and occasionally as a gemstone (cabochons) or for metaphysical collecting.

Geological facts

The milky or cloudy appearance is caused by tiny inclusions of gas and/or liquid trapped during the crystal's growth process. It is one of the most abundant minerals on Earth's crust.

Field identification & locations

Identify in the field by its ability to scratch glass, its lack of cleavage, and its characteristic cloudy white 'waxy' appearance. Commonly found in riverbeds, mountains, and mining tailings worldwide.