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); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

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

Identified April 5, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal fluids in veins or as the last mineral to crystallize from cooling magma. Its white color comes from minute fluid inclusions of gas and/or liquid trapped during crystal growth.

Uses & applications

Used in glassmaking, abrasives, as a flux in metallurgy, and as a semi-precious stone in jewelry. It is also highly valued by mineral collectors and used in landscaping.

Geological facts

Milky quartz is the most common variety of crystalline quartz. Historically, it was used by many cultures to create tools and arrowheads before the widespread use of metals.

Field identification & locations

Identify in the field by its hardness (it scratches glass easily but cannot be scratched by a steel knife) and its white, waxy appearance. It is ubiquitous in mountainous regions and riverbeds worldwide.