mineral

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

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

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

Identified April 1, 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 the Mohs scale. Color: White to translucent. Luster: Vitreous to greasy. Crystal Structure: Hexagonal (trigonal). Cleavage: None (conchoidal fracture). Specific Gravity: 2.65.

Formation & geological history

Formed through the crystallization of magma or from hydrothermal veins. It is found in almost all geological environments and can be from any geological age, often occurring in massive form within veins.

Uses & applications

Used in glassmaking, abrasives, foundry sand, and the production of silicon for electronics. Milky quartz is also used in landscaping and as a decorative stone.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. The white color of 'Milky Quartz' is caused by tiny fluid inclusions of gas or liquid trapped during crystal growth.

Field identification & locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and typical conchoidal fracture. It is ubiquitous globally, especially in mountain ranges and river beds.