mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, milky white or cloudy color due to microscopic fluid inclusions, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, and no true cleavage. Specific gravity is approximately 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, milky white or cloudy color due to microscopic fluid inclusions, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, and no true cleavage. Specific gravity is approximately 2.65.
Formation & geological history
Forms in igneous, metamorphic, and sedimentary environments. It commonly precipitates from hydrothermal solutions at various temperatures and pressures over millions of years.
Uses & applications
Used in glassmaking, abrasives, electronics (though typically clear quartz is preferred for piezoelectric uses), decorative items, and lapidary work.
Geological facts
Milky quartz is the most common variety of the quartz family found on Earth. Its cloudy appearance is caused by tiny liquid or gas-filled inclusions trapped inside the crystals during their growth.
Field identification & locations
Easily identified in the field by its high hardness (scratches glass), white milky color, and conchoidal fracture. Found worldwide in almost all geological settings, particularly in pegmatites and hydrothermal veins.
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