Milky Quartz

Physical Properties

Hardness: 7 on Mohs scale; Color: White to opaque/cloudy; Luster: Vitreous (glassy) to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & Geological History

Formed through the crystallization of silica-rich hydrothermal fluids in veins or as a primary constituent in igneous rocks like granite. The 'milky' appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Uses & Applications

Used in glassmaking, abrasives, electronics (due to piezoelectric properties), construction material (aggregate), and as ornamental stones or landscaping rocks.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of quartz found in nature.

Field Identification & Locations

Identify in the field by its ability to scratch steel and glass, its lack of cleavage, and its characteristic waxy, white appearance. It is found globally in mountainous regions and riverbeds.

Identified on: 4/13/2026

Mode: Standard