mineral
Quartz Geode
Crystalline Silicon Dioxide (SiO2) within a geode structure
Hardness: 7 on Mohs scale; Color: white to translucent crystals; Luster: vitreous (glassy); Crystal Structure: hexagonal (trigonal); Cleavage: none (conchoidal fracture); Specific Gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- white to translucent crystals
- Luster
- vitreous (glassy)
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Physical properties
Hardness: 7 on Mohs scale; Color: white to translucent crystals; Luster: vitreous (glassy); Crystal Structure: hexagonal (trigonal); Cleavage: none (conchoidal fracture); Specific Gravity: 2.65.
Formation & geological history
Formed in cavities within sedimentary or volcanic rock. Groundwater rich in dissolved silica seeps into these hollow spaces and precipitates crystals over thousands to millions of years.
Uses & applications
Commonly used for home decor, educational specimens, metaphysical purposes, and jewelry. Quartz itself is used in electronics and glass manufacturing.
Geological facts
Geodes are like nature's 'surprise packages' because their plain, lumpy exterior gives no hint of the sparkling crystal cavity inside. The word 'geode' comes from the Greek word 'Geoides' meaning 'earth-like'.
Field identification & locations
Identified by a round or egg-shaped exterior with a hollow center filled with inward-pointing crystals. Commonly found in desert regions like Morocco, Mexico, and the Midwestern United States (specifically Iowa and Illinois).
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