mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7.0 on Mohs scale; Color: Opaque white to milky; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7
Color: Opaque white to milky
Luster: Vitreous to greasy

Identified June 3, 2026More mineral →

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Physical properties

Hardness: 7.0 on Mohs scale; Color: Opaque white to milky; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed from silica-rich hydrothermal solutions in veins, or through the cooling of magma in pegmatites. It is one of the most common minerals on Earth, found across all geological ages.

Uses & applications

Used in the production of glass, ceramics, and abrasives. In electronics, it is used for its piezoelectric properties. It is also used in landscaping, as a gemstone (cabochons), and for crystal healing collections.

Geological facts

The milky appearance is caused by tiny liquid or gas inclusions trapped during the crystal's growth. It is the most common variety of crystalline quartz.

Field identification & locations

Identify in the field by its hardness (will scratch glass), white color, and lack of cleavage. Commonly found in riverbeds, mountain tracks, and as veins in metamorphic rocks worldwide.