mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on the Mohs scale; Color: Milky white to cloudy translucent; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: Poor/Conchoidal fracture; Specific gravity: 2.65

Hardness: 7 on the Mohs scale
Color: Milky white to cloudy translucent
Luster: Vitreous to greasy

Identified May 5, 2026More mineral →

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Physical properties

Hardness: 7 on the Mohs scale; Color: Milky white to cloudy translucent; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: Poor/Conchoidal fracture; Specific gravity: 2.65

Formation & geological history

Forms in hydrothermal veins and pegmatites through the cooling of silica-rich solutions. It is found in a wide variety of igneous, metamorphic, and sedimentary environments across all geological ages.

Uses & applications

Used in the manufacturing of glass, ceramics, and abrasives. High-quality quartz is used in electronics for its piezoelectric properties. It is also used in jewelry and as a decorative stone.

Geological facts

The milky appearance is caused by tiny inclusions of gas or liquid trapped during the crystal's growth. It is one of the most abundant minerals in the Earth's continental crust.

Field identification & locations

Identify in the field by its hardness (will scratch glass), white color, and lack of visible cleavage. Commonly found in riverbeds, mountain ranges, and near volcanic regions. Look for conchoidal fractures and a matte to glassy shine.