mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: White to translucent; Luster: Vitreous to greasy; Crystal Structure: Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65.

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

Identified June 25, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: White to translucent; Luster: Vitreous to greasy; Crystal Structure: Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65.

Formation & geological history

Formed in hydrothermal veins and cooling igneous intrusions, particularly in granitic rocks. It is found in geological settings ranging from Precambrian to recent times.

Uses & applications

Used in construction as an abrasive, in the manufacture of glass, ceramics, and electronics (due to piezoelectric properties), and as a collector's specimen or decorative stone.

Geological facts

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

Field identification & locations

Identified by its waxy-white appearance, its ability to scratch glass, and its lack of cleavage. It is found worldwide, common in stream beds and mountainous regions.