mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Hardness: 7 (Mohs scale), Color: White to translucent milky appearance, Luster: Vitreous to greasy, Crystal structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: White to translucent milky appearance, 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 mineral deposits and in pegmatites. The white 'milky' color is caused by microscopic inclusions of gas or liquid trapped during crystal growth.
Uses & applications
Used in construction as a masonry component, in the glass industry, and as an abrasive. Polished pieces are used in decorative items and inexpensive jewelry.
Geological facts
Quartz is the most abundant and widespread mineral found at Earth's surface. Milky quartz is the most common variety of crystalline quartz.
Field identification & locations
Identified by its ability to scratch glass or steel, its characteristic white color, and lack of cleavage. Common worldwide in mountain ranges and riverbeds.
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Mineral/Rock
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Biotite Schist
Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]
metamorphic