mineral

Milky Quartz

Silicon dioxide (SiO2)

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

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

Identified May 20, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed through the cooling of magma or precipitation from hydrothermal veins. The milky appearance is caused by tiny fluid or gas inclusions trapped during crystal growth.

Uses & applications

Used in glassmaking, jewelry (as semi-precious stones), gravel/construction, and as a source of silicon for electronics.

Geological facts

Milky quartz is the most common variety of crystalline quartz. While once ignored by many collectors, high-quality tumbled versions and those with unique inclusions are popular in metaphysical communities.

Field identification & locations

Identify by its hardness (will scratch glass), white cloudy appearance, and lack of cleavage. Commonly found in riverbeds, mountains, and as garden stones globally.