mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness of 7 on Mohs scale, milky white to translucent color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, no true cleavage, specific gravity of approximately 2.65.

Identified July 27, 2026More mineral →

Explore Milky Quartz in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness of 7 on Mohs scale, milky white to translucent color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, no true cleavage, specific gravity of approximately 2.65.

Formation & geological history

Formed in hydrothermally active environments, igneous pegmatites, and metamorphic veins. The cloudy white appearance is caused by tiny inclusions of gas, liquid, or other minerals trapped during crystal growth.

Uses & applications

Used in landscaping, glassmaking, electronics (silicon extraction), abrasives, and decorative stone carving or tumbled stones.

Geological facts

Milky quartz is the most common variety of crystalline quartz found on Earth. Its white, opaque appearance is often due to microscopic fluid inclusions that occurred as the mineral crystallized millions of years ago.

Field identification & locations

Can be identified in the field by its hardness (scratches glass easily), lack of cleavage, white to off-white greasy luster, and conchoidal fracture. Extremely widespread in quartz-bearing gravels, stream beds, and mountainous regions worldwide.