mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

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

Identified April 7, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed from silica-rich hydrothermal fluids cooling in veins, or within igneous pegmatites. The white color comes from microscopic inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glassmaking, abrasives, electronics (piezoelectric properties), and as a gemstone or decorative material in landscaping and jewelry.

Geological facts

Milky quartz is the most common variety of crystalline quartz. It can sometimes contain minute traces of gold in hydrothermal veins, leading to its nickname 'bull quartz' among prospectors.

Field identification & locations

Identify by its ability to scratch glass, its milky white color, and the absence of cleavage planes. It is found globally, particularly in mountainous regions and riverbeds.