mineral

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

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

Identified June 28, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins. The white color is caused by tiny gas or liquid inclusions trapped during crystal growth. They are found across all geological ages.

Uses & applications

Used in glassmaking, ceramics, as an abrasive, and in the electronics industry for its piezoelectric properties. Used in jewelry as cabochons and widely collected by amateurs.

Geological facts

Milky quartz is the most common variety of crystalline quartz. While often considered 'low value' by gemstone standards, it can contain inclusions of gold or other valuable minerals in specific geological settings.

Field identification & locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and white 'cloudy' appearance. It is found globally in riverbeds, mountains, and quartz veins within granite.