mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: White to cloudy; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: White to cloudy
Luster: Vitreous to greasy

Identified May 24, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: White to cloudy; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Forms through the crystallization of silica-rich hydrothermal fluids in veins or as a late-stage mineral in igneous pegmatites. It is found in geological environments ranging from Precambrian to recent times.

Uses & applications

Used in glass making, as an abrasive, in the production of silicon chips, as gravel in construction, and occasionally as a decorative stone or for metaphysical collecting.

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 common minerals on Earth's crust.

Field identification & locations

Identify in the field by its hardness (scratches glass), lack of cleavage, and white opaque color. It is commonly found in mountain ranges, stream beds, and quartz veins within granite.