mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Hardness: 7 (Mohs scale), Color: White to pale yellow, 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 pale yellow, Luster: Vitreous to greasy, Crystal structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific gravity: 2.65
Formation & geological history
Formed from the cooling of silica-rich magma or through hydrothermal precipitation in veins. Frequently found in pegmatites and hydrothermal ore deposits across all geological eras.
Uses & applications
Used in the production of glass, ceramics, and as an abrasive. Also used as a gemstone (semi-precious) and extensively in quartz watches and electronics for its piezoelectric properties.
Geological facts
Milky quartz gets its cloudy appearance from tiny gas and/or liquid bubbles trapped during the crystal's growth. It is the most common variety of crystalline quartz found on Earth's crust.
Field identification & locations
Identify in the field by its hardness (scratches glass), lack of cleavage, and white/cloudy appearance. Commonly found in river beds, mountain ranges, and near granite outcrops globally.
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Green Apatite on Albite
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