mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale. Color: White to translucent milky white. Luster: Vitreous to greasy. Fracture: Conchoidal. Crystal structure: Hexagonal (trigonal). Specific Gravity: 2.65.

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

Identified July 24, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale. Color: White to translucent milky white. Luster: Vitreous to greasy. Fracture: Conchoidal. Crystal structure: Hexagonal (trigonal). Specific Gravity: 2.65.

Formation & geological history

Forms in hydrothermal veins, pegmatites, and igneous intrusion borders. The milky white opacity is caused by tiny inclusions of gas, liquid, or both trapped during crystal growth.

Uses & applications

Used in glassmaking, abrasives, semiconductor production, and decorative or lapidary purposes as polished stones and cabochons.

Geological facts

Quartz is one of the most abundant minerals in the Earth's continental crust. Its white appearance comes from microscopic fluid inclusions that scatter light passing through the crystal.

Field identification & locations

Can be identified in the field by its hardness (scratches steel/glass, cannot be scratched by a knife), lack of cleavage, milky white color, and glassy to greasy luster. Commonly found in riverbeds, mountain veins, and pegmatites worldwide.