mineral

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, colorless or transparent, vitreous (glassy) luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.

Identified July 31, 2026More mineral →

Explore Clear Quartz Crystal in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Hardness of 7 on the Mohs scale, colorless or transparent, vitreous (glassy) luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.

Formation & geological history

Formed predominantly from hydrothermal veins, pegmatites, and as a primary constituent of igneous, metamorphic, and sedimentary rocks over millions of years.

Uses & applications

Widely used in electronics (oscillators), optical equipment, gemstone carving, jewelry, and crystal healing.

Geological facts

Clear quartz is one of the most abundant minerals in Earth's continental crust and exhibits piezoelectric properties, meaning it can generate an electrical charge when compressed.

Field identification & locations

Identified by its hexagonal crystal form, high hardness (scratches glass), and vitreous luster. Found globally, with notable deposits in Brazil, Arkansas (USA), and Madagascar.