mineral

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Hardness: 7.0 on Mohs scale; Color: White to clouded translucent; Luster: Vitreous (glassy) to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7
Color: White to clouded translucent
Luster: Vitreous (glassy) to greasy

Identified March 7, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins. The white 'milky' appearance is caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glassmaking, abrasives, and as a source of silicon for electronics. In jewelry, it is often used for beads, cabochons, and decorative carvings. It is also a popular specimen for beginner collectors.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is often found in gold-bearing veins, making it a primary indicator for prospectors during the gold rush era.

Field identification & locations

Identify in the field by its inability to be scratched by a steel knife (7 hardness), its translucent white color, and the lack of cleavage planes. It is found globally, common in mountain ranges and riverbeds.