Milky Quartz

Physical Properties

Hardness: 7 on Mohs scale; Color: Cloudy white to grayish; Luster: Vitreous (glassy) to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & Geological History

Formed from silica-rich hydrothermal fluids cooling in veins or as a major constituent of igneous rocks like granite. Its milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Uses & Applications

Used in glass manufacturing, as an abrasive, in electronics for its piezoelectric properties, and as a decorative stone in landscaping and jewelry.

Geological Facts

Quartz is the second most abundant mineral in Earth's crust. Milky quartz is the most common variety of quartz. Some milky quartz contains traces of gold within its veins, which was a primary target for miners during gold rushes.

Field Identification & Locations

Identified by its white color, glassy luster, and inability to be scratched by a steel knife. Commonly found in riverbeds, beaches, and mountain outcrops. It is a very durable mineral resistant to weathering.

Identified on: 5/3/2026

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