mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Identified June 1, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed from the crystallization of silica-rich hydrothermal fluids in veins or as a primary mineral in igneous rocks like granite. Found in environments ranging from volcanic to metamorphic belts.

Uses & applications

Used as a source of glass and abrasives, in electronics (piezoelectric properties), and widely as decorative gravel or low-cost gemstones/beads.

Geological facts

Milky quartz gets its cloudy appearance from microscopic inclusions of liquids or gases trapped during the crystal's growth. It is the most common variety of crystalline quartz.

Field identification & locations

Identify in the field by its distinct white color, inability to be scratched by a steel knife, and lack of cleavage. It is found globally in mountainous terrains and river beds.