mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Hardness: 7 on Mohs scale
Color: Cloudy white to translucent
Luster: Vitreous

Identified May 9, 2026More mineral →

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Physical properties

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

Formation & geological history

Forms from the cooling of magma or in hydrothermal veins where mineral-rich water deposits silica. It is found in various geological ages and environments, particularly in igneous and metamorphic terrains.

Uses & applications

Used in glassmaking, abrasives, construction aggregates, electronics (due to piezoelectric properties), and as decorative stones or cabochons in jewelry.

Geological facts

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

Field identification & locations

Identify by its hardness (scratches glass), waxy to vitreous luster, and lack of cleavage. Often found in riverbeds, mountains, or near granite outcrops as veins. Collectors look for pieces with interesting internal textures or crystal habits.