mineral

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to creamy; Luster: Vitreous to greasy; Crystal Structure: Trigonal (often massive in this form); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

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

Identified July 1, 2026More mineral →

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Physical properties

Formation & geological history

Forms through the crystallization of silica-rich hydrothermal solutions or cooling magma. The milky appearance is caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glassmaking, abrasives, electronics (as a source of silicon), and as decorative gravel or landscaping stones. Also popular for lapidary work and healing crystal collections.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of quartz found in nature. Tiny bubbles of water or air trapped 2 billion years ago are what give it the white color.

Field identification & locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and white opaque color. It is commonly found in veins within igneous and metamorphic rocks globally.