mineral
Quartz (Druzy)
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Colorless to white/cream; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Colorless to white/cream
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: Colorless to white/cream; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65.
Formation & geological history
Formed through the precipitation of silica from hydrothermal fluids in rock cavities, fractures, or geodes. The tiny crystals (druze) grow over a host rock or mineral base.
Uses & applications
Used extensively in jewelry (pendants and rings), decorative ornaments, and by mineral collectors. Pure quartz is also vital in electronics and glass manufacturing.
Geological facts
The term 'druzy' refers to a coating of fine crystals on a rock fracture or geode. Quartz is the most common mineral on Earth's continental crust.
Field identification & locations
Identified by its sparkling 'sugar-like' appearance and high hardness (it will scratch glass). Commonly found in volcanic regions and sedimentary basins worldwide.
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Mineral/Rock
Banded Gneiss (River Rock/Pebble)
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Green Apatite on Albite
Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]
mineral