mineral

Quartz (Variety: Rock Crystal Cluster)

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 on the Mohs scale; Color: Colorless to white/translucent; Luster: Vitreous (glassy); Crystal structure: Hexagonal (trigonal); Cleavage: Indistinct/Conchoidal fracture; Specific gravity: 2.65

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

Identified May 23, 2026More mineral →

Explore Quartz (Variety: Rock Crystal Cluster) in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Formation & geological history

Formed from hydrothermal solutions or cooling silica-rich magma; common in geodes and veins. Can form across various geological eras from Precambrian to the present.

Uses & applications

Used in electronics (oscillators), manufacturing of glass, abrasives, jewelry, and widely collected as metaphysical or decorative specimens.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Pure quartz is traditionally called rock crystal or clear quartz.

Field identification & locations

Identify by its hardness (scratches glass), lack of cleavage, and hexagonal crystal points. Found worldwide, with major deposits in Brazil, Madagascar, and Arkansas, USA.