mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Mohs hardness of 7; white to milky color due to microscopic fluid inclusions; vitreous to greasy luster; trigonal crystal system; conchoidal fracture with no true cleavage; specific gravity of 2.65.

Identified July 29, 2026More mineral →

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Physical properties

Mohs hardness of 7; white to milky color due to microscopic fluid inclusions; vitreous to greasy luster; trigonal crystal system; conchoidal fracture with no true cleavage; specific gravity of 2.65.

Formation & geological history

Forms in hydrothermal veins, pegmatites, and igneous, metamorphic, and sedimentary rocks globally across all geological time scales as silica-rich fluids cool and crystallize.

Uses & applications

Used in glassmaking, electronics, abrasive materials, decorative objects, and crystal specimen collecting.

Geological facts

Milky quartz is the most common variety of crystalline quartz found on Earth. The milky appearance is caused by tiny liquid or gas inclusions trapped within the crystal matrix during formation.

Field identification & locations

Easily identified in the field by its high hardness (scratches glass easily), lack of cleavage, conchoidal fracture, and characteristic cloudy white color. Found worldwide.