mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

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

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

Identified May 7, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed during the final stages of hydrothermal crystallization in veins or pegmatites. The milky appearance is caused by tiny fluid inclusions of gas and/or liquid trapped during crystal growth.

Uses & applications

Used as a source of silicon for semiconductors, in the manufacture of glass and ceramics, as an abrasive, and frequently carved into decorative objects or used in crystal healing and metaphysical practices.

Geological facts

Milky Quartz is the most common variety of crystalline quartz. While it lacks the transparency of rock crystal, the dense inclusions create its signature ghost-like appearance. Large deposits can be found globally.

Field identification & locations

Identified in the field by its hardness (will scratch glass), white color, and lack of cleavage. Look for it in quartz veins within granite or metamorphic rock. Found abundantly in the United States, Brazil, and India.