mineral
Milky Quartz
Silicon Dioxide (SiO2)
Mohs hardness of 7, white to off-white opaque color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, specific gravity 2.65
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Physical properties
Mohs hardness of 7, white to off-white opaque color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, specific gravity 2.65
Formation & geological history
Formed during the crystallization of magma or from hydrothermal solutions precipitated in rock veins and cavities over millions of years
Uses & applications
Used in glassmaking, ceramics, electronics, abrasives, and as decorative gravel, tumbled stone, or lapidary material
Geological facts
The milky white opacity is caused by microscopic fluid inclusions of gas and liquid trapped during the crystal's formation
Field identification & locations
Identified by its hardness (scratches glass), glass-like to greasy luster, lack of cleavage, and distinct white/translucent appearance. Extremely common worldwide in granitic pegmatites and hydrothermal veins.
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Mineral/Rock