mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to translucent with iron oxidation staining; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Milky white to translucent with iron oxidation staining
Luster: Vitreous to greasy

Identified July 22, 2026More mineral →

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Physical properties

Formation & geological history

Forms in a wide range of geological environments, most commonly in hydrothermal veins, pegmatites, and as a major component of igneous rocks like granite. The milky appearance is caused by microscopic fluid inclusions trapped during crystal growth.

Uses & applications

Used in glassmaking, ceramics, electronics (silicon chips and quartz oscillators), as an abrasive, in decorative gravel, and for lapidary/crystal healing collections.

Geological facts

Milky quartz is one of the most abundant minerals on Earth's continental crust. Its white color is caused by tiny bubbles of gas and liquid trapped inside the mineral while it was forming millions of years ago.

Field identification & locations

Identified in the field by its hardness (scratches glass, cannot be scratched by a steel nail), white color, lack of cleavage, and uneven to conchoidal fracture. Found worldwide in stream beds, gravel pits, and rock outcrops.