mineral

Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: typically white or colorless in this form; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: typically white or colorless in this form
Luster: Vitreous to waxy

Identified June 22, 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: typically white or colorless in this form; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed in almost all geological environments, most commonly from the crystallization of molten magma or by precipitation from hot hydrothermal veins. It can be found in rocks of all ages.

Uses & applications

Extensively used in making glass, ceramics, and abrasives. High-purity quartz is used in electronics (oscillators) and solar panels. Common specimens are prized by novice collectors.

Geological facts

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

Field identification & locations

Identify in the field by its hardness (it scratches glass) and lack of cleavage. It is found globally in riverbeds, mountains, and beaches. Collectors should look for clarity and crystal terminations.