mineral

Milky Quartz

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 24, 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 through the crystallization of silica-rich hydrothermal solutions in veins or as a primary constituent in igneous rocks like granite. Its white color is caused by tiny inclusions of liquid or gas trapped during crystal growth.

Uses & applications

Used in glassmaking, abrasives, gemstones (cabochons), electronics (piezoelectric properties), and as an ornamental stone in landscaping.

Geological facts

Milky quartz is the most common variety of crystalline quartz. Historically, it was used by many indigenous cultures to create stone tools due to its hardness and predictable fracture patterns.

Field identification & locations

Identify in the field by its inability to be scratched by a steel knife, its white 'cloudy' appearance, and the absence of cleavage planes. Frequently found in riverbeds, mountain ranges, and as pebbles in soil globally.