mineral
Druzy Quartz
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: White/Clear, Luster: Vitreous to Adamantine (glittery), Crystal Structure: Hexagonal (as tiny microcrystals), Cleavage: None/Conchoidal
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Physical properties
Hardness: 7 (Mohs scale), Color: White/Clear, Luster: Vitreous to Adamantine (glittery), Crystal Structure: Hexagonal (as tiny microcrystals), Cleavage: None/Conchoidal
Formation & geological history
Formed through hydrothermal precipitation where mineral-rich water flows over a rock substrate or into cavities, cooling and leaving behind a layer of tiny crystals. This can occur in volcanic or sedimentary environments over millions of years.
Uses & applications
Primarily used in jewelry (rings, pendants, earrings), decorative arts, and as collector specimens due to its high sparkle and natural aesthetic.
Geological facts
The word 'druzy' refers to the coating of crystals on a rock surface; it is derived from the German word 'druse', meaning a cavity or geode. It is essentially the 'carpet' of crystals found inside a geode.
Field identification & locations
Identify by its sparkling 'sugar-like' appearance and high hardness (it can scratch glass). Commonly found as a lining in agatized geodes from locations like Brazil or Uruguay.
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