mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 Mohs scale; Color: Milky white to translucent; Luster: Vitreous; Crystal Structure: Hexagonal (Trigonal); Cleavage: Indistinct; Specific Gravity: 2.65

Hardness: 7 Mohs scale
Color: Milky white to translucent
Luster: Vitreous

Identified June 16, 2026More mineral →

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Physical properties

Hardness: 7 Mohs scale; Color: Milky white to translucent; Luster: Vitreous; Crystal Structure: Hexagonal (Trigonal); Cleavage: Indistinct; Specific Gravity: 2.65

Formation & geological history

Forms primarily from hydrothermal solutions in many environments including igneous, metamorphic, and sedimentary settings. The signature white color is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glass manufacturing, electronics (due to piezoelectric properties), construction aggregates, and occasionally as minor gemstones or in landscaping.

Geological facts

Milky Quartz is the most common variety of crystalline quartz. Historically, it was used by many cultures for tools and decorative objects. Large deposits often contain valuable pockets of gold.

Field identification & locations

Identified by its white waxy appearance, hardness (it will scratch glass), and lack of cleavage. It is found globally and is extremely common in mountain ranges and riverbeds.