mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: White to translucent with orange/brown iron staining; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: White to translucent with orange/brown iron staining
Luster: Vitreous to greasy

Identified June 30, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal fluids in veins or as a primary constituent in igneous rocks like granite. Often found in continental crust across all geological ages.

Uses & applications

Used in glass manufacturing, electronics (due to piezoelectric properties), construction aggregates, and as a semi-precious gemstone in jewelry and carvings.

Geological facts

Milky quartz gets its cloudy appearance from tiny fluid inclusions of gas or liquid trapped during crystal growth. It is one of the most common minerals on the Earth's surface.

Field identification & locations

Identify by its ability to scratch glass, its lack of cleavage, and its characteristic greasy luster. Often found in vein deposits or as pebbles in stream beds.