Milky Quartz

Physical Properties

Hardness: 7 on Mohs scale; Color: Milk-white, cloudy; Luster: Vitreous (glassy) 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 fluids in veins or as a late-stage mineral in igneous pegmatites. It is found in geological settings ranging from Precambrian to recent ages.

Uses & Applications

Used in the production of glass, ceramics, and abrasives. Also used as a decorative stone in landscaping and occasionally in jewelry as cabochons, though it is primarily a collector's specimen in this raw form.

Geological Facts

The milky white color is caused by tiny inclusions of gas or liquid trapped during the crystal's growth. It is one of the most common minerals on Earth's crust.

Field Identification & Locations

Identify in the field by its white color, lack of cleavage, and ability to scratch glass. It is commonly found in mountain ranges, stream beds, and quartz veins within granite or metamorphic rocks. Look for its characteristic 'greasy' luster on fresh breaks.

Identified on: 4/30/2026

Mode: Standard