mineral

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Hardness: 7 (Mohs scale); Color: White to translucent; Luster: Vitreous (glassy) to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

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

Identified April 9, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: White to translucent; Luster: Vitreous (glassy) to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal solutions in veins or as a late-stage mineral in igneous pegmatites. The milky appearance is caused by tiny fluid inclusions of gas and/or liquid trapped during crystal growth.

Uses & applications

Used as a gemstone in necklaces and beads, in the production of glass and ceramic glazes, as an abrasive, and in the electronics industry for its piezoelectric properties.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of quartz and can be found in almost every geological environment.

Field identification & locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and white cloudy appearance. It is found globally in mountainous regions, riverbeds, and as veins in other host rocks.