mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

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

Identified June 9, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed in hydrothermal veins and pegmatites through the cooling of silica-rich solutions in the Earth's crust. It is common in various geological ages and environments, particularly in igneous and metamorphic terrains.

Uses & applications

Used in glass making, ceramics, as an abrasive, and in the production of silicon chips for electronics. In landscaping and interior design, it is valued for its aesthetic appeal.

Geological facts

The milky appearance is caused by microscopic inclusions of fluids (gas or liquid) trapped during crystal growth. It is the most common variety of crystalline quartz.

Field identification & locations

Identified in the field by its hardness (scratches glass), lack of cleavage, and characteristic white color. It is globally ubiquitous, often found in mountain ranges and as pebbles in riverbeds.