mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

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

Identified July 4, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed through the crystallization of magma or from hydrothermal veins. The cloudy appearance is caused by tiny liquid or gas inclusions trapped during crystal growth. Found in almost all geological environments.

Uses & applications

Used in glassmaking, ceramics, electronics (as a silicon source), jewelry (beads and cabochons), and as landscaping stone.

Geological facts

Milky quartz is the most common variety of crystalline quartz. It is often found as the 'mother rock' for gold in hydrothermal veins and was historically a key indicator for prospectors.

Field identification & locations

Identify in the field by its hardness (will scratch glass), white color, and Lack of cleavage. It is extremely common in mountainous regions and riverbeds globally.