mineral

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Hardness: 7 on the Mohs scale. Color: White to cloudy. Luster: Vitreous to greasy. Crystal structure: Trigonal/Hexagonal. Cleavage: Poor/none (conchoidal fracture). Specific gravity: 2.65.

Hardness: 7 on the Mohs scale
Color: White to cloudy
Luster: Vitreous to greasy

Identified April 5, 2026More mineral →

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Physical properties

Hardness: 7 on the Mohs scale. Color: White to cloudy. Luster: Vitreous to greasy. Crystal structure: Trigonal/Hexagonal. Cleavage: Poor/none (conchoidal fracture). Specific gravity: 2.65.

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal fluids or within igneous pegmatites. The 'milky' appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glassmaking, ceramics, abrasives, and as a source of silicon for electronic components. It is also used as a gemstone and for decorative landscaping.

Geological facts

Milky quartz is the most common variety of crystalline quartz. It can exist for hundreds of millions of years due to its high chemical and physical resistance.

Field identification & locations

Identify in the field by its waxy-to-glassy luster, extreme hardness (it will scratch glass), and lack of cleavage. Commonly found in riverbeds, mountain veins, and glacial till globally.