mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

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

Identified June 14, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed primarily from the cooling of silica-rich hydrothermal fluids in veins or within pegmatites. It is one of the most common minerals found across all geological ages and environments.

Uses & applications

Used in the glass and ceramic industries, as an abrasive, and sometimes in landscaping. High-quality specimens are used in watchmaking and electronics for their piezoelectric properties.

Geological facts

The milky appearance is caused by tiny inclusions of gas or liquid trapped during the crystal's growth. It is the most common variety of crystalline quartz.

Field identification & locations

Check for its ability to scratch glass and its lack of cleavage. It is found globally, particularly in mountainous regions and riverbeds. Look for a waxy or greasy surface on broken faces.