mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

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

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

Identified May 7, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed from the crystallization of silica-rich hydrothermal solutions or cooling magma. It is commonly found in igneous intrusions like pegmatites and hydrothermal veins. Its age can range from billions of years to relatively recent geological periods.

Uses & applications

Used as a source for silicon in electronics, an abrasive in sandpaper/glassmaking, and widely used for landscaping, construction aggregate, and decorative carvings in jewelry.

Geological facts

Milky quartz gets its white color from tiny bubbles of gas or liquid trapped during the crystal's formation. It is one of the most common minerals found in the Earth's crust.

Field identification & locations

Identify in the field by its ability to scratch glass, its milky white opaque appearance, and the lack of cleavage (it breaks with irregular curved surfaces). It is found globally, often occurring as prominent white veins in darker host rocks.