mineral
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Hardness of 7 on Mohs scale, white to translucent color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.65.
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Physical properties
Hardness of 7 on Mohs scale, white to translucent color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.65.
Formation & geological history
Forms in hydrothermal veins, pegmatites, and igneous, metamorphic, and sedimentary environments. Tiny gas or liquid bubbles trapped during crystal growth give it its milky white appearance.
Uses & applications
Used in electronics (piezoelectric properties), glassmaking, abrasives, construction aggregates, lapidary art, and as decorative stone.
Geological facts
Milky quartz is one of the most abundant minerals on Earth's crust. Its white opacity is caused by microscopic fluid inclusions trapped inside the silicon dioxide structure during crystallization.
Field identification & locations
Can be identified in the field by its hardness (scratches glass, cannot be scratched by steel), lack of cleavage, white to off-white opaque appearance, and conchoidal fracture. Common worldwide.
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