mineral

Clear Quartz

Silicon Dioxide (SiO2)

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

Hardness: 7 (Mohs scale)
Color: Colorless/Transparent
Luster: Vitreous

Identified April 10, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed from the crystallization of silica-rich magma or hydrothermal solutions in veins. It is found in all types of geological environments and can be found in rocks from nearly every geological age.

Uses & applications

Used in electronics (oscillators), glassmaking, abrasives, jewelry (gemstones), and as a popular specimen for collectors.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the Greek word 'krustallos', meaning 'ice', as ancient people believed it was permanently frozen water.

Field identification & locations

Identify by its hardness (will scratch glass easily), lack of cleavage, and hexagonal crystal habit. Common world-wide but high-quality clear specimens are frequently found in Arkansas (USA), Brazil, and Madagascar.