mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale), Color: White to translucent creamy-white, Luster: Vitreous to greasy, Crystal Structure: Trigonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Identified July 20, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale), Color: White to translucent creamy-white, Luster: Vitreous to greasy, Crystal Structure: Trigonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Formation & geological history

Forms from the cooling and solidification of silica-rich hydrothermal fluids or within igneous pegmatites. The milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in decorative landscaping, as a source for silica and silicon in glassmaking and electronics, and as tumbled stones for hobbyists and metaphysical collections.

Geological facts

Milky quartz is the most common variety of crystalline quartz. It is often found in large veins that can cut through various types of host rocks like granite or gneiss.

Field identification & locations

Identify by its ability to scratch glass and its lack of cleavage. Look for it in high-energy stream beds or eroded veins. It is found globally across all continents.