mineral
Quartz Geode
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale; Color: Clear to white interior crystals with tan/beige exterior rind; Luster: Vitreous (glassy) crystals with dull matrix; Crystal Structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: ~2.65
- Hardness
- 7 on Mohs scale
- Luster
- Vitreous (glassy) crystals with dull matrix
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Physical properties
Hardness: 7 on Mohs scale; Color: Clear to white interior crystals with tan/beige exterior rind; Luster: Vitreous (glassy) crystals with dull matrix; Crystal Structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: ~2.65
Formation & geological history
Formed via secondary chemical precipitation within gas cavities (vesicles) in volcanic rocks or cavities in sedimentary rocks, such as limestone, as mineral-rich fluids flow through over thousands to millions of years.
Uses & applications
Popular as decorative display specimens, educational samples, lapidary art materials, and metaphysical crystals.
Geological facts
Geodes often look like ordinary, unremarkable rounded rocks on the outside, hiding sparkling crystal cavities within that are only revealed when cracked open or cut.
Field identification & locations
Identified by the hollow or partially hollow cavity lined with well-formed quartz crystals inside a tough, chalcedony or limestone matrix. Commonly found in locations like Morocco, Brazil, Mexico, and the Midwestern United States (Keokuk region).
