mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Cloudy white to opaque; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Cloudy white to opaque
Luster: Vitreous to greasy

Identified April 5, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Cloudy white to opaque; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed from the crystallization of silica-rich hydrothermal fluids in veins or geodynamic environments. It is one of the most common minerals in the Earth's crust and can be found in igneous, metamorphic, and sedimentary settings.

Uses & applications

Used in glassmaking, abrasives, electronics (due to piezoelectric properties), and as a gemstone or decorative stone in landscaping and jewelry.

Geological facts

The milky white color is caused by microscopic inclusions of gas or liquid trapped during the crystal's growth. It is often found in massive form rather than distinct crystals.

Field identification & locations

Identify in the field by its hardness (it will scratch glass), lack of cleavage, and white 'milky' appearance. It is ubiquitous globally, especially in mountain ranges and stream beds.