mineral

Quartz (Druzy/Macro-crystalline)

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: White, cream, or yellowish due to iron staining; Luster: Vitreous to dull; Crystal structure: Trigonal (often appearing as tiny pin-head sized crystals); Cleavage: None (conchoidal fracture).

Hardness: 7 (Mohs scale)
Color: White, cream, or yellowish due to iron staining
Luster: Vitreous to dull

Identified May 24, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal processes where silica-rich fluids cool and precipitate within rock cavities or veins. This specimen likely represents a fragment from a geode or a quartz vein.

Uses & applications

Used in the gemstone industry for jewelry (druzy settings), as an abrasive in industry, and widely collected as mineral specimens by hobbyists.

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'.

Field identification & locations

Identify in the field by its hardness (will scratch glass), lack of reaction to acid, and typical hexagonal crystal habits. Found abundantly in mountain ranges and gravel deposits globally.

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