mineral
Quartz Druzy (Geode Fragment)
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Colorless to milky white; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: None/Conchoidal fracture.
- Hardness
- 7 on Mohs scale
- Color
- Colorless to milky white
- Luster
- Vitreous (glassy)
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Physical properties
Hardness: 7 on Mohs scale; Color: Colorless to milky white; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: None/Conchoidal fracture.
Formation & geological history
Formed by the precipitation of mineral-rich groundwater within a cavity or vug in a host rock. These specific formations are common in sedimentary limestone or volcanic basalt cavities where silica-rich fluids cool or evaporate over millions of years.
Uses & applications
Used primarily for metaphysical collecting, home decor, and occasionally as a source of industrial silica. In higher quality, it is used for jewelry (cut as cabochons or left as druzy slabs).
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. The term 'druzy' refers to the tiny glittering crystals that cover a rock surface, resembling sugar or frost.
Field identification & locations
Identify by its hardness (it will scratch glass) and its crystal habit. Look for the cluster of small, pointed hexagonal terminals. Commonly found in stream beds or limestone deposits in regions like the American Midwest (Keokuk geodes) or Brazil.
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