mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 Mohs; Color: White to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 Mohs
Color: White to translucent
Luster: Vitreous to greasy

Identified June 4, 2026More mineral →

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Physical properties

Hardness: 7 Mohs; Color: White to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed during the final stages of magma crystallization or through hydrothermal deposition in veins. Milky color is caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glassmaking, abrasives, electronics (piezoelectric properties), and frequently as decorative landscaping stone or tumbled pocket stones.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. The 'milky' appearance is due to millions of tiny bubbles trapped inside the crystal structure.

Field identification & locations

Identified in the field by its hardness (it will scratch glass), white color, and lacks of cleavage planes. Found globally in almost all geological environments.