mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Hardness of 7 on Mohs scale, milky white to pale iron-stained yellow color, vitreous to greasy luster, trigonal crystal structure (massive form), no true cleavage, conchoidal fracture, specific gravity around 2.65
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Physical properties
Hardness of 7 on Mohs scale, milky white to pale iron-stained yellow color, vitreous to greasy luster, trigonal crystal structure (massive form), no true cleavage, conchoidal fracture, specific gravity around 2.65
Formation & geological history
Forms in hydrothermal veins, pegmatites, igneous intrusive bodies, and metamorphic environments from silica-rich fluid crystallization over various geological eras
Uses & applications
Used in electronics (piezoelectric properties), glassmaking, ceramics, abrasives, decorative river stone landscaping, and mineral specimen collecting
Geological facts
Milky quartz gets its cloudy white appearance from tiny fluid inclusions (bubbles of gas or liquid) trapped inside the crystal during its formation billions of years ago.
Field identification & locations
Can be identified by its inability to be scratched by a steel nail (hardness 7), lack of cleavage, and translucent to opaque milky white appearance. Extremely common in gravel beds, rivers, and mountain ranges worldwide.
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