mineral
Quartz Druzy
Crystalline Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale; Color: Clear to milky white/pink; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (Trigonal); Cleavage: Indistinct; Specific Gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Clear to milky white/pink
- Luster
- Vitreous (glassy)
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Physical properties
Hardness: 7 on Mohs scale; Color: Clear to milky white/pink; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (Trigonal); Cleavage: Indistinct; Specific Gravity: 2.65
Formation & geological history
Druzy occurs as the final layer of crystallization in rock cavities or geodes. It forms when mineral-rich water precipitates tiny crystals over millions of years onto the surface of a host rock. Often found in igneous or sedimentary vugs.
Uses & applications
Primarily used in jewelry (pendants and rings) to showcase natural sparkle, and as decorative cabinet specimens for mineral collectors.
Geological facts
The word 'Druse' refers to a coating of fine crystals on a rock fracture or cavity. While quartz is the most common mineral to form druzy, it can also occur with garnet, calcite, or malachite.
Field identification & locations
Identify in the field by looking for a 'sugar-coated' appearance on the inside of cracked rocks. It will scratch glass easily. Common in volcanic regions and sedimentary lime beds worldwide.
