mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale), Color: cloudy white or translucent, Luster: vitreous (glassy) to greasy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Identified May 10, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale), Color: cloudy white or translucent, Luster: vitreous (glassy) to greasy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Formation & geological history

Forms in hydrothermal veins or as a late-magmatic mineral in pegmatites. The milky white color is caused by microscopic inclusions of gas or liquid trapped during the crystal's growth.

Uses & applications

Used in the glass industry, as an abrasive, in decorative landscaping, and occasionally as a low-cost gemstone for lapidary work.

Geological facts

Quartz is one of the most abundant minerals on Earth's crust. Milky quartz is the most common variety of crystalline quartz found in nature; it can sometimes contains microscopic gold or other hydrothermal minerals.

Field identification & locations

Identify by its hardness (scratches glass), lack of cleavage, and characteristic cloudy white appearance. It is found globally across all rock types: igneous, metamorphic, and sedimentary.