Milky Quartz

Physical Properties

Hardness: 7 on Mohs scale; Color: Milky white to cream; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & Geological History

Formed from silica-rich hydrothermal fluids cooling in veins or as a component of igneous and metamorphic rocks. Frequently found as water-worn pebbles in riverbeds or beaches.

Uses & Applications

Used as a gemstone (cabochons), in glass making, as a source of silicon for electronics, and in decorative landscaping or aquarium gravel.

Geological Facts

The milky white color is caused by tiny inclusions of gas or liquid trapped during crystal growth. It is one of the most common minerals on the Earth's crust.

Field Identification & Locations

Identify in the field by its hardness (scratches glass), white color, and lack of cleavage. Often found in riverbeds, mountain veins, and glacial deposits globally.

Identified on: 5/20/2026

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