mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: White to translucent; Luster: Vitreous when polished, waxy when raw; Crystal structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: White to translucent
Luster: Vitreous when polished, waxy when raw

Identified June 26, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal processes, crystallization from magma, or as a secondary mineral in sedimentary environments. Milky quartz gets its cloudiness from microscopic fluid inclusions trapped during crystal growth.

Uses & applications

Used in glassmaking, as an abrasive, in electronics for its piezoelectric properties, and widely in landscape gardening and costume jewelry.

Geological facts

Milky quartz is the most common variety of crystalline quartz. It is often found in massive form rather than as distinct crystals. The white color is caused by tiny bubbles of gas or liquid.

Field identification & locations

Identify in the field by its hardness (will scratch glass and steel), white color, and Lack of cleavage. It is ubiquitous in mountainous regions and riverbeds globally.