mineral

Clear Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Colorless/Transparent to Milky; Luster: Vitreous; Crystal structure: Hexagonal; Cleavage: Indistinct; Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Colorless/Transparent to Milky
Luster: Vitreous

Identified May 9, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Colorless/Transparent to Milky; Luster: Vitreous; Crystal structure: Hexagonal; Cleavage: Indistinct; Specific Gravity: 2.65

Formation & geological history

Forms in igneous, metamorphic, and sedimentary environments, most often appearing as large crystals in pegmatites or hydrothermal veins. It can form at various temperatures and pressures over millions of years.

Uses & applications

Used extensively in the electronics industry (oscillators), optical instruments, glass making, and as a semi-precious gemstone for jewelry and ornamentation.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is piezoelectric, meaning it generates an electric charge when mechanical pressure is applied, which is why it is used in watches.

Field identification & locations

Identify by its hardness (scratches glass), lack of easy cleavage, and characteristic hexagonal crystal habit. Found globally, with notable deposits in Brazil, Madagascar, and the USA (Arkansas).