mineral

Milky Quartz

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

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 lacks true cleavage.

Identified July 29, 2026More mineral →

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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 lacks true cleavage.

Formation & geological history

Formed in hydrothermal veins, pegmatites, and metamorphic environments from cooling silica-rich fluids over geological time scales.

Uses & applications

Used in decorative items, lapidary work, gemstone carving, and occasionally as a source of high-purity silicon after processing.

Geological facts

Milky quartz is the most common variety of crystalline quartz found on Earth. Its cloudy appearance is caused by tiny liquid or gas bubbles trapped within the crystal matrix during its formation.

Field identification & locations

Easily identifiable in the field by its milky white color, lack of cleavage, and high hardness (it readily scratches glass). It can be found globally in almost every geological setting.