mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Opaque white to translucent
Luster: Vitreous to greasy

Identified July 5, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Forms in hydrothermal veins or from cooling magma. This common variety gets its white color from tiny fluid inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glassmaking, abrasives, semiconductor industry, construction aggregate, and as decorative stone or landscaping material.

Geological facts

Milky quartz is one of the most common minerals on Earth. Its white opacity is caused by millions of microscopic bubbles trapped during the mineral's formation over millions of years.

Field identification & locations

Identify by its hardness (it can scratch glass), its lack of cleavage, and its characteristic waxy or milky appearance. Found globally in almost all geological environments.