mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on the Mohs scale; Color: Cloudy white due to microscopic fluid inclusions; Luster: Vitreous (glassy) to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on the Mohs scale
Color: Cloudy white due to microscopic fluid inclusions
Luster: Vitreous (glassy) to greasy

Identified March 1, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal fluids or within igneous pegmatites as magma cools. It can be found in rocks from almost any geological age.

Uses & applications

Used widely in glass making, ceramics, as an abrasive, and in the manufacturing of optical and electronic equipment. Lower-grade specimens are often used as decorative gravel or for metaphysical collecting.

Geological facts

Milky quartz is the most common variety of crystalline quartz. Its white color is caused by tiny bubbles of gas or liquid trapped during the crystal's growth, known as inclusions.

Field identification & locations

Identify in the field by its distinct white color, lack of cleavage, and ability to scratch glass. It is found globally in veins, mountains, and as river pebbles. Collectors look for well-formed crystal points.