Milky Quartz

Physical Properties

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

Formation & Geological History

Forms in hydrothermal veins, pegmatites, and as a primary mineral in igneous rocks like granite. The milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Uses & Applications

Used as a gemstone, in glassmaking, as an abrasive, and in the manufacturing of electronics and solar panels. Also popular for metaphysical and decorative purposes.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz follows the General formula for Quartz but owes its opacity to microscopic fluid inclusions dating back to its formation.

Field Identification & Locations

Identify in the field by its hardness (cannot be scratched by steel), lack of cleavage, and white color. Commonly found in quartz veins and as pebbles in riverbeds. Often associated with gold mineralization in certain geological settings.

Identified on: 5/17/2026

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