mineral

Quartz

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, vitreous luster, transparent to translucent, uneven to conchoidal fracture, no true cleavage, specific gravity of 2.65.

Identified July 29, 2026More mineral →

Explore 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 of 7 on the Mohs scale, vitreous luster, transparent to translucent, uneven to conchoidal fracture, no true cleavage, specific gravity of 2.65.

Formation & geological history

Forms in a wide variety of geological environments including igneous, metamorphic, and sedimentary rocks. It is a primary component of granite and sandstone and precipitates from hydrothermal solutions.

Uses & applications

Widely used in electronics, oscillators, glassmaking, abrasives, and as gemstones or lapidary material.

Geological facts

Quartz is one of the most abundant and widely distributed minerals found on Earth's continental crust. It exhibits piezoelectric properties, meaning it can generate an electrical charge in response to applied mechanical stress.

Field identification & locations

Easily identified by its high hardness (scratches glass), lack of cleavage, and characteristic vitreous luster. Found globally in almost every geological setting.