mineral

Milky Quartz

Silicon dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: White to translucent; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65.

Hardness: 7 (Mohs scale)
Color: White to translucent
Luster: Vitreous to greasy

Identified April 11, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: 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 fluids in veins or as a late-stage mineral in igneous pegmatites. It is found in geological settings ranging from Precambrian to recent times.

Uses & applications

Used in glassmaking, as an abrasive, in the production of silicon alloys, as a gemstone in inexpensive jewelry, and for landscaping or construction aggregate.

Geological facts

Milky quartz gets its white, cloudy appearance from tiny inclusions of gas or liquid trapped during the crystal's growth. It is one of the most abundant minerals on Earth's crust.

Field identification & locations

Identify in the field by its ability to scratch glass, its milky white appearance, and lack of cleavage (it breaks into irregular, curved shards). Frequently found in gravel pits, mountains, and stream beds.