Milky Quartz

Physical Properties

Hardness: 7 (Mohs scale), Color: White to tan/light brown due to impurities, Luster: Vitreous to greasy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (Conchoidal fracture), Specific Gravity: 2.65

Formation & Geological History

Formed through hydrothermal processes in veins, or through the cooling of silica-rich magma in igneous rocks like granite. Often found in pegmatites and metamorphic environments.

Uses & Applications

Used in glassmaking, as an abrasive, in the electronics industry for its piezoelectric properties, and as a decorative stone in landscaping or jewelry.

Geological Facts

Milky quartz gets its cloudy appearance from microscopic inclusions of fluids trapped during crystal growth. It is one of the most common minerals in the Earth's crust.

Field Identification & Locations

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

Identified on: 5/8/2026

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