mineral
Quartz Geode / Druzy Quartz
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale. Color: White, pinkish-white interior with a darker host rock exterior. Luster: Vitreous to crystalline. Crystal Structure: Hexagonal (trigonal). Cleavage: None (conchoidal fracture). Specific Gravity: ~2.65.
- Hardness
- 7 on Mohs scale
- Luster
- Vitreous to crystalline
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Physical properties
Hardness: 7 on Mohs scale. Color: White, pinkish-white interior with a darker host rock exterior. Luster: Vitreous to crystalline. Crystal Structure: Hexagonal (trigonal). Cleavage: None (conchoidal fracture). Specific Gravity: ~2.65.
Formation & geological history
Forms when silica-rich hydrothermal fluids precipitate microcrystalline or macrocrystalline quartz inside hollow cavities (vugs) within sedimentary or volcanic host rocks.
Uses & applications
Used in lapidary work, jewelry making, educational geological displays, and as mineral collection specimens.
Geological facts
Geodes often look like ordinary, non-descript round stones on the outside, but when cracked open, they reveal brilliant interior crystal cavities.
Field identification & locations
Field identification involves checking for a outer weathered matrix enclosing a hollow or crystalline interior cavity. Widely found in basaltic lava flows and limestone formations worldwide.
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