mineral

Milky 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 March 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 crystallization of silica-rich hydrothermal fluids in veins or pegmatites. The white color is caused by microscopic inclusions of gas or liquid trapped during crystal growth. Can be found in rocks of all geological ages.

Uses & applications

Used as a source of silicon for electronics, an abrasive in sandpaper, in glassmaking, and as decorative gravel or landscaping stone. Tumbled specimens are popular in holistic healing and beginner mineral collections.

Geological facts

Milky quartz is one of the most common minerals on Earth's crust. It is often found in 'veins' that cut through other rock types. While usually considered common, it is the parent mineral for many semi-precious gemstones like amethyst and citrine.

Field identification & locations

Identify in the field by its white color, inability to be scratched by steel, and lack of cleavage (it breaks like glass). It is ubiquitous worldwide, especially in mountain ranges and stream beds. Collectors should look for unique shapes or gold-bearing veins occasionally associated with it.