mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: White to translucent, Luster: Vitreous to greasy, Crystal structure: Hexagonal/Trigonal, Cleavage: Indistinct/Conchoidal fracture, Specific gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: White to translucent, Luster: Vitreous to greasy, Crystal structure: Hexagonal/Trigonal, Cleavage: Indistinct/Conchoidal fracture, Specific gravity: 2.65
Formation & geological history
Formed through the cooling and crystallization of silica-rich magma or from hydrothermal veins. The milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.
Uses & applications
Used in glassmaking, abrasives, gemstones (cabochons), electronics (piezoelectric properties), and widely collected by hobbyists for display.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Milky Quartz is essentially cloudy clear quartz; the white 'cloudiness' is actually microscopic bubbles of water.
Field identification & locations
Identify by its ability to scratch glass, its white color, and its lack of cleavage (it breaks into irregular, curved shards). Found worldwide in mountains, riverbeds, and beaches.
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