mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

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

Identified July 10, 2026More mineral →

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Physical properties

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

Formation & geological history

Forms in hydrothermal veins, pegmatites, and as a primary mineral in igneous rocks like granite. The milky appearance is caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in landscaping, as a source of silicon for semiconductors, glass production, and occasionally in jewelry as cabochons or beads.

Geological facts

Milky quartz is the most common variety of crystalline quartz. It can be found in almost every geological environment on Earth and often serves as the 'host' rock for gold in quartz veins.

Field identification & locations

Identify in the field by its hardness (scratches glass), white color, and lack of cleavage. It is found globally in riverbeds, mountains, and gardens.