mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: White to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: White to translucent
Luster: Vitreous to greasy

Identified May 16, 2026More mineral →

Identify your own rocks.

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

App Store Google Play

Physical properties

Hardness: 7 on Mohs scale; Color: White to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed from silica-rich hydrothermal fluids cooling in veins or from the crystallization of magma. It is one of the most common minerals in the Earth's crust and can be found in various geological ages.

Uses & applications

Used as an abrasive, in the production of glass and ceramics, as a gemstone in tumbled jewelry, and as a landscaping material.

Geological facts

The milky white color is caused by tiny inclusions of gas or liquid trapped during the crystal's growth. It is often found associated with gold and other precious metals in hydrothermal veins.

Field identification & locations

Identify by its hardness (it can scratch glass), its white appearance, and lack of cleavage. It is commonly found in riverbeds, mountains, and as garden stones worldwide.