mineral

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: White, opaque to translucent; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

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

Identified May 13, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: White, opaque to translucent; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Formation & geological history

Formed through the cooling of silica-rich magma or through hydrothermal activity in veins. It is found in a wide variety of geological environments including igneous plutons and metamorphic rocks across all geological eras.

Uses & applications

Used in glassmaking, abrasives, electronics (due to piezoelectric properties), construction aggregates, and widely used in jewelry as tumbled stones and decorative carvings.

Geological facts

Milky quartz gets its white color from tiny fluid inclusions of gas or liquid trapped during crystal growth. It is the most common variety of crystalline quartz found on Earth's crust.

Field identification & locations

Identify in the field by its hardness (it will scratch glass), lack of cleavage, and typical milky appearance. It is found globally, particularly in areas with granite outcrops or riverbeds.