mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to cream, often with brownish iron staining; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Opaque white to cream, often with brownish iron staining
Luster: Vitreous to greasy

Identified June 28, 2026More mineral →

Explore Milky Quartz in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

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

Uses & applications

Used in the production of glass, ceramics, and abrasives. Used in electronics for its piezoelectric properties. Common in landscaping, decorative stone, and as a collector's item for metaphysical purposes.

Geological facts

Milky quartz is the most common variety of crystalline quartz. While clear quartz is prized for clarity, the microscopic bubbles in milky quartz can sometimes contain ancient fluids that scientists study to learn about Earth's history.

Field identification & locations

Identify by its ability to scratch glass, its lack of cleavage, and its waxy/vitreous luster. Found globally in mountainous regions, riverbeds, and as garden stones. Collectors should look for unique internal fractures or iron-stained patterns.