mineral

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale; Color: Colorless/Transparent to white; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Colorless/Transparent to white
Luster: Vitreous (glassy)

Identified April 13, 2026More mineral →

Explore Quartz (Clear Quartz/Rock 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: 7 on Mohs scale; Color: Colorless/Transparent to white; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins. It can be found in all types of geological environments and ages, often at the site of volcanic activity or in sedimentary deposits.

Uses & applications

Used in electronics (as piezoelectric crystal), glass manufacturing, abrasives, jewelry (as a gemstone), and as a popular collector's mineral for spiritual or aesthetic display.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is highly resistant to both chemical and physical weathering. Transparent varieties like this are often called 'Rock Crystal'.

Field identification & locations

Identify in the field by its ability to scratch glass, its lack of cleavage (it breaks into curved, shell-like shards), and its glassy luster. Often found in riverbeds, mountains, and sandy regions.