mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

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

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

Identified April 10, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal solutions or the cooling of igneous magmas. Its white color is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glass manufacturing, as an abrasive, in decorative landscaping, for carvings, and occasionally in lower-end jewelry. High-purity quartz is essential for electronic components.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of quartz and can be found in almost every geological environment.

Field identification & locations

Identify in the field by its white color, ability to scratch glass (hardness 7), and lack of cleavage. Look for it in veins within other rocks or as pebbles in stream beds.