mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: Indistinct/Conchoidal fracture; Specific gravity: 2.65

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

Identified May 14, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: Indistinct/Conchoidal fracture; Specific gravity: 2.65

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins. The white color is caused by tiny gas or liquid inclusions trapped during crystal growth. They can be found in rocks from virtually any geological age.

Uses & applications

Used in glassmaking, ceramics, electronics (as oscillators due to piezoelectric properties), and as decorative landscaping stone or semi-precious gemstones in jewelry.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of quartz and can be found almost everywhere on the planet.

Field identification & locations

Identify in the field by its hardness (it will scratch glass), white opaque color, and lack of cleavage. It is commonly found in riverbeds, mountains, and as 'veins' in other rock types.