mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Cloudy white to opaque; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (Trigonal); Cleavage: Indistinct/Conchoidal fracture; Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Cloudy white to opaque
Luster: Vitreous to greasy

Identified June 19, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Cloudy white to opaque; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (Trigonal); Cleavage: Indistinct/Conchoidal fracture; Specific Gravity: 2.65

Formation & geological history

Formed in hydrothermal veins and pegmatites through the cooling of silica-rich fluids. It is found in many geological environments and can be from any geological age, often associated with igneous intrusions.

Uses & applications

Used in the glass and ceramic industries, as an abrasive, in landscaping, and occasionally as a gemstone for beads or ornaments. In industry, it is a source of silicon for semiconductors.

Geological facts

The milky appearance is caused by tiny inclusions of gas or liquid trapped during the crystal's growth. It is one of the most common minerals on the Earth's continental crust.

Field identification & locations

Identified in the field by its hardness (scratches glass), white color, and lack of cleavage. Often found as veins in metamorphic or igneous rocks. Common worldwide.