mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
Hardness: 7 Mohs; Color: White to translucent; Luster: Vitreous/Glassy; Crystal structure: Trigonal (hexagonal prisms); Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
- Hardness
- 7 Mohs
- Color
- White to translucent
- Luster
- Vitreous/Glassy
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Physical properties
Hardness: 7 Mohs; Color: White to translucent; Luster: Vitreous/Glassy; Crystal structure: Trigonal (hexagonal prisms); Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
Formation & geological history
Formed in cavities (vugs) of sedimentary or volcanic rocks. Ground water rich in dissolved silica seeped into hollow spaces and precipitated crystals over millions of years.
Uses & applications
Primarily used for decorative purposes, collecting, and metaphysical uses. Pure quartz is also used in glassmaking and electronics.
Geological facts
Geodes are often nondescript rocks on the outside that contain hollow cavities lined with crystals. The word geode comes from the Greek word 'Geoides', meaning earth-like.
Field identification & locations
Identify by the presence of a hollow or partially hollow center lined with tiny pointed crystals. Commonly found in desert environments or limestone beds. Collectors check weight; hollow geodes are lighter than solid rocks.
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