mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale. Color: Opaque white to translucent cream. Luster: Vitreous (glassy) to greasy. Crystal structure: Hexagonal/Trigonal. Cleavage: Indistinct (conchoidal fracture). Specific gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Opaque white to translucent cream
Luster: Vitreous (glassy) to greasy

Identified March 26, 2026More mineral →

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 cooling of silica-rich magma or from hydrothermal veins. The white color is caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth. Can be found in geological formations ranging from Precambrian to recent ages.

Uses & applications

Used as a gemstone (usually tumbled), in landscaping, as a source of silica for glass and ceramics, and in the production of silicon wafers for electronics.

Geological facts

Milky quartz is the most common variety of crystalline quartz. Historically, it was used by many cultures for stone tools. Large, well-formed 'snow quartz' crystals are often found in the Alps and the Ural Mountains.

Field identification & locations

Identify by its ability to scratch glass (hardness 7), lack of cleavage planes, and typical white 'cloudy' appearance. It is found globally, particularly in pegmatites, hydrothermal veins, and as pebbles in riverbeds.