mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Cloudy white to opaque; Luster: Vitreous to greasy; Crystal Structure: Trigonal (often found as massive aggregates); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

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

Identified March 20, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins where hot water carrying dissolved silica cools and precipitates. Its milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used widely in industry for glassmaking, abrasives, and as a component in concrete. In jewelry, it is often used for beads, cabochons, and ornamental carvings. It is also highly popular in metaphysical and crystal collecting communities.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz specifically gets its white color from fluid inclusions ('bubbles') that are only micrometers in size but numerous enough to scatter light.

Field identification & locations

Identify in the field by its hardness (it can scratch glass), lack of cleavage, and characteristic glassy-to-greasy appearance. It is found globally, particularly in pegmatites and quartz veins. For collectors, look for pieces with interesting surface textures or associations with other minerals.