mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Cloudy white to pale yellow; Luster: Vitreous to greasy; Crystal Structure: Hexagonal/Trigonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

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

Identified May 10, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Cloudy white to pale yellow; Luster: Vitreous to greasy; Crystal Structure: Hexagonal/Trigonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal fluids in veins or pegmatites. The cloudy appearance is caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in the production of glass and ceramics, as an abrasive, in electronics for its piezoelectric properties, and widely as a decorative stone or tumbled gemstone in jewelry.

Geological facts

Milky quartz is the most common variety of crystalline quartz found on Earth. It is often found in gold-bearing quartz veins, serving as an indicator for prospectors.

Field identification & locations

Identify by its hardness (scratches glass), lack of cleavage, and characteristic waxy-milk appearance. It is found globally, particularly in mountainous regions and riverbeds as water-worn pebbles.