mineral

Clear Quartz Cluster

Silicon Dioxide (SiO2)

Mohs hardness: 7. Color: Colorless to white. Luster: Vitreous (glassy). Crystal system: Trigonal/Hexagonal. Cleavage: Indistinct. Specific gravity: 2.65.

Hardness: 7
Color: Colorless to white
Luster: Vitreous (glassy)

Identified July 18, 2026More mineral →

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Physical properties

Mohs hardness: 7. Color: Colorless to white. Luster: Vitreous (glassy). Crystal system: Trigonal/Hexagonal. Cleavage: Indistinct. Specific gravity: 2.65.

Formation & geological history

Formed from cooling silica-rich hydrothermal fluids in igneous and metamorphic environments, typically in veins or geodes. Can form over millions of years at high temperatures and pressures.

Uses & applications

Used in jewelry, precision instruments (oscillators for clocks and radios), glass making, abrasives, and as a popular specimen for crystal collectors.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'quarz', which means 'hard'. Clear quartz is often called 'Rock Crystal'.

Field identification & locations

Identified in the field by its six-sided prismatic crystals ending in pyramids and its ability to scratch glass. Found worldwide, with major deposits in Brazil and Arkansas, USA.