mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale), Color: White to transparent/cloudy, Luster: Vitreous to greasy, Crystal structure: Trigonal (Hexagonal), Cleavage: None (conchoidal fracture), Specific gravity: 2.65

Identified June 28, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale), Color: White to transparent/cloudy, Luster: Vitreous to greasy, Crystal structure: Trigonal (Hexagonal), Cleavage: None (conchoidal fracture), Specific gravity: 2.65

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal solutions in veins or as a major constituent of igneous rocks like granite and pegmatites. It is found in all geological ages.

Uses & applications

Used as an abrasive, in the manufacture of glass and ceramics, as an oscillator in electronics, and in various jewelry or decorative items.

Geological facts

Milky quartz is the most common variety of crystalline quartz. Its white color is caused by tiny fluid inclusions of gas and/or liquid trapped during crystal growth.

Field identification & locations

Identify by its hardness (scratches glass), lack of cleavage, and white cloudy appearance. Found globally in mountainous regions, riverbeds, and as vein fillings.