mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

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

Identified June 17, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal solutions in veins or during the cooling of igneous pegmatites. It is one of the most abundant minerals on Earth.

Uses & applications

Used as a source of silicon for electronics, in landscaping, as an abrasive, and occasionally in jewelry as cabochons or beads. It is also a popular specimen for beginner collectors.

Geological facts

The milky white color is caused by tiny inclusions of gas or liquid trapped during the crystal's formation. It is the most common variety of crystalline quartz found in nature.

Field identification & locations

Identify by its white color, inability to be scratched by a steel knife (hardness 7), and lack of cleavage. Commonly found in mountain ranges, stream beds, and quartz veins worldwide.