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 6, 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

Formed through the crystallization of silica-rich hydrothermal fluids in veins or from the cooling of magma in igneous intrusions such as pegmatites. The white color is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glass making, abrasive blasting, high-purity silica for electronics, landscaping, and as a semi-precious stone for gemstone collectors or decorative items.

Geological facts

Milky quartz is one of the most common varieties of crystalline quartz on Earth. It is often found in the 'mother lode' veins associated with gold deposits.

Field identification & locations

Identified in the field by its hardness (will scratch glass), white color, and lack of cleavage. Found globally in a wide variety of geological environments.