mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to opaque; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

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

Identified April 11, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Milky white to opaque; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Formation & geological history

Formed in hydrothermal veins and pegmatites. It gains its white color from tiny fluid inclusions of gas or liquid trapped during crystal growth. They are found across all geological ages.

Uses & applications

Used in glassmaking, abrasives, and as a material for the electronics industry (quartz oscillators). It is also popular for decorative landscaping and as an introductory mineral for collectors.

Geological facts

Milky quartz is the most common variety of crystalline quartz. While other quartz varieties are valued for their clarity, milky quartz is prized for its ghostly, translucent appearance.

Field identification & locations

Identify in the field by its hardness (it can scratch glass), its lack of cleavage, and its typical white, cloudy appearance. It is found globally, often emerging from eroded granite or in riverbeds.