mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Identified June 20, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed from the crystallization of silica-rich magma or precipitation from hydrothermal fluids in veins. Common in various geological environments from igneous to metamorphic belts.

Uses & applications

Used in glassmaking, abrasives, electronics (piezoelectric properties), and as decorative gravel or ornamental stone.

Geological facts

Milky quartz is the most common variety of crystalline quartz. Its white color is caused by tiny fluid inclusions of gas and/or liquid trapped during crystal growth.

Field identification & locations

Identify by its hardness (it scratches glass), lack of cleavage, and common occurrence in white veins. Found globally in mountainous regions and riverbeds.