mineral

Quartz (Drusy/Crystalline variety)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Colorless to milky white/tan with iron staining; Luster: Vitreous (glassy) to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Colorless to milky white/tan with iron staining
Luster: Vitreous (glassy) to waxy

Identified March 14, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal processes where silica-rich fluids precipitate in rock cavities or veins. It can occur across various geological ages, often found in pegmatites or sedimentary geodes.

Uses & applications

Used in the microelectronics industry for oscillators, glass making, and as an abrasive. In this rough form, it is primarily used for lapidary work, jewelry (cabochons), or as decoration and collector specimens.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'quarz', which has Slavic origins meaning 'hard'. It is piezoelectric, meaning it generates an electric charge when mechanical pressure is applied.

Field identification & locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and crystal habit. Common in mountainous regions, riverbeds, and desert 'pavement'. Collectors should look for distinct crystal faces or points within the mass.

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