mineral

Milky Quartz

Silicon dioxide (SiO2)

Hardness: 7 (Mohs scale), Color: White to cloudy (due to fluid/gas inclusions), Luster: Vitreous to greasy, Crystal structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Identified April 20, 2026More mineral →

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Physical properties

Formation & geological history

Formed from silica-rich hydrothermal fluids or within pegmatites. It is commonly found in igneous intrusions and metamorphic veins. It can be found in terrains ranging from Precambrian to Cenozoic.

Uses & applications

Used in the production of glass, ceramics, and abrasives. In electronics, it's used for its piezoelectric properties. It is also used as decorative stone, in landscaping, and as a collector's mineral.

Geological facts

Milky quartz is the most common variety of crystalline quartz. The white 'milky' color is caused by millions of tiny bubbles of gas or liquid trapped during the crystal's growth.

Field identification & locations

Identify in the field by its hardness (scratches glass/steel), lack of cleavage, and characteristic waxy/glassy appearance. It is found globally in mountainous regions and riverbeds.