mineral
Quartz Geode
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white or translucent with microcrystalline to macrocrystalline quartz lining a cavity, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, and specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically white or translucent with microcrystalline to macrocrystalline quartz lining a cavity, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, and specific gravity of 2.65.
Formation & geological history
Formed in hollow spaces in sedimentary or igneous rocks where silica-rich groundwater or hydrothermal fluids precipitate quartz crystals along the cavity walls over long periods.
Uses & applications
Used in ornamental displays, specimen collecting, lapidary arts, and sometimes as a source of quartz for various industrial applications.
Geological facts
Geodes appear as ordinary, unremarkable rocks on the outside, but cracking them open reveals a sparkling interior of crystals. The central vein of iron staining visible here gives this particular specimen a unique character.
Field identification & locations
Can be identified by its relative weight, hollow sound when tapped, or bumpy nodular exterior. Commonly found in limestone formations, volcanic ash beds, and weathering zones worldwide.
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