mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: Opaque 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: Opaque white to translucent
Luster: Vitreous to greasy

Identified April 14, 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: Opaque white to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed from the crystallization of silica-rich hydrothermal fluids in veins or as a major constituent in igneous rocks like granite. Its white color comes from minute fluid inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in the glass and ceramics industry, as a flux in metallurgy, and as decorative stone in landscaping. High-purity quartz is used in electronics and semiconductors.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz specifically is the most common variety found in nature and can be found in mountain ranges worldwide.

Field identification & locations

Identify by its hardness (it will scratch glass and steel), lack of cleavage, and waxy or glassy luster. Found globally in almost every geological environment, often as prominent white veins in darker host rock.