mineral
Quartz Geode with Iron Oxide
Silicon Dioxide (SiO2) with Hematite/Goethite coatings
AI-generated identification · may be incorrectHardness: 7 on Mohs scale; Color: Clear to white quartz with brownish-orange to rusty iron oxide staining; Luster: Vitreous to dull; Crystal structure: Trigonal/Hexagonal quartz druse lining a cavity; Cleavage: None (conchoidal fracture).
- Hardness
- 7 on Mohs scale
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: Clear to white quartz with brownish-orange to rusty iron oxide staining; Luster: Vitreous to dull; Crystal structure: Trigonal/Hexagonal quartz druse lining a cavity; Cleavage: None (conchoidal fracture).
Formation & geological history
Forms in hydrothermal veins or cavity pockets within sedimentary or volcanic host rocks where silica-rich fluids precipitate quartz crystals, often stained by secondary iron minerals during weathering.
Uses & applications
Popular among mineral collectors, used in lapidary arts, education, decor, and metaphysical display pieces.
Geological facts
Small cavities lined with tiny crystals like this are called vugs or mini-geodes. The brown-orange rim and accents are caused by limonite, hematite, or goethite precipitation.
Field identification & locations
Identified by tiny hexagonal crystal terminations lining an interior cavity within a massive milky quartz or chalcedonic matrix, alongside rusty iron oxide staining. Common worldwide in volcanic and limestone terrains.
