mineral

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Hardness: 7 (Mohs scale); Color: White, cloudy; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None/Conchoidal fracture; Translucent to opaque.

Hardness: 7 (Mohs scale)
Color: White, cloudy
Luster: Vitreous to greasy

Identified July 6, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: White, cloudy; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None/Conchoidal fracture; Translucent to opaque.

Formation & geological history

Formed during the final stages of hydrothermal mineralisation within veins or from the cooling of silica-rich magma in igneous rocks. The milky appearance is caused by tiny inclusions of liquid, gas, or both, trapped during crystal growth.

Uses & applications

Used in the manufacturing of glass, ceramics, and sandpaper. Also popular in landscaping, aquarium decor, and as tumbled stones for metaphysical and decorative purposes.

Geological facts

Milky quartz is the most common variety of crystalline quartz. Historically, it has been used for millstones and in primitive tool making due to its durability.

Field identification & locations

Check for hardness by trying to scratch glass (quartz will scratch it). Look for the lack of cleavage and the presence of milky, white 'cloudiness'. Commonly found in riverbeds and mountainous terrain.