Milky Quartz

Physical Properties

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

Formation & Geological History

Forms through the crystallization of silica-rich magma or hydrothermal veins. The white color is caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth.

Uses & Applications

Used as a gemstone (low value), in glass making, as an abrasive, in the production of silicon, and in landscaping or construction aggregate.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is often found in gold-bearing hydrothermal veins and was historically used by miners as an indicator for finding gold deposits.

Field Identification & Locations

Identify by its white opaque color, inability to be scratched by steel, and conchoidal (glass-like) fracture. It is ubiquitous globally, commonly found in mountain ranges and riverbeds.

Identified on: 4/28/2026

Mode: Standard