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 crystallization of silica-rich hydrothermal solutions or cooling magma. The milky appearance is caused by microscopic fluid inclusions trapped during the crystal's growth.

Uses & Applications

Used in glassmaking, abrasives, and as a component in concrete. Low-quality specimens are used in landscaping, while higher-quality milky quartz can be used for cabochons or carving.

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 hardness (it will scratch glass), its lack of cleavage, and its characteristic waxy or vitreous luster. It is common in riverbeds, mountain ranges, and within quartz veins in metamorphic rocks.

Identified on: 4/13/2026

Mode: Standard