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

Formed through the cooling of silica-rich hydrothermal fluids in veins or as a primary mineral in igneous rocks like granite. Its milky appearance comes from microscopic fluid inclusions trapped during growth.

Uses & Applications

Used in glass making, silicon production, as an abrasive, and in landscaping. Polished stones are used in jewelry, home decor, and spiritual practices.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of quartz. Some milky quartz contains gold within its structure, making it a target for prospectors.

Field Identification & Locations

Identify by its ability to scratch glass, its milky white color, and the lack of cleavage (it breaks in irregular curves). It is found globally, particularly in mountainous regions and riverbeds.

Identified on: 4/25/2026

Mode: Standard