mineral
Cloudy Quartz
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: Translucent white to milky white, Luster: Vitreous (glassy) 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: Translucent white to milky white, Luster: Vitreous (glassy) 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 or cooling of magma in igneous rocks; the cloudy appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.
Uses & applications
Used in the manufacturing of glass, electronics (oscillators), abrasives, and as a popular decorative stone or gemstone in jewelry.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Milky or cloudy quartz is the most common variety of quartz found in nature.
Field identification & locations
Identify in the field by its hardness (will scratch glass), lack of cleavage, and conchoidal (shell-like) fracture patterns. Frequently found in pegmatites and quartz veins worldwide.
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