mineral

Clear Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Colorless to transparent; Luster: Vitreous (glass-like); Crystal structure: Hexagonal; Cleavage: Indistinct/None (shows conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Colorless to transparent
Luster: Vitreous (glass-like)

Identified March 16, 2026More mineral →

Explore Clear Quartz in the encyclopedia →

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: Colorless to transparent; Luster: Vitreous (glass-like); Crystal structure: Hexagonal; Cleavage: Indistinct/None (shows conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed through the cooling and crystallization of silica-rich magma or from hydrothermal veins. It occurs in all types of geological environments and can range from millions to billions of years old.

Uses & applications

Extensively used in electronics for its piezoelectric properties (oscillators), glassmaking, abrasives, jewelry, and alternative healing practices.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is a 'piezoelectric' material, meaning it generates an electric charge when mechanical stress is applied.

Field identification & locations

Identify in the field by its hardness (will scratch glass and steel), lack of cleavage, and hexagonal crystal points. Found worldwide, with major deposits in Brazil and Arkansas, USA.