mineral
Quartz Geode
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, clear to white color with vitreous luster, hexagonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, clear to white color with vitreous luster, hexagonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Formed in hollow spaces in sedimentary or volcanic rocks where mineral-rich hydrothermal solutions or groundwater deposit silica over extended periods.
Uses & applications
Used in crystal healing, decorative display items, lapidary arts, and gemstone collections.
Geological facts
Geodes start as nodules in rock cavities. Over millions of years, groundwater carrying silica or other dissolved minerals seeps into the hollow interior, slowly crystallizing along the walls.
Field identification & locations
Easily identified by its outer weathered rock rind and hollow interior lined with sparkling quartz crystal points. Found worldwide, notably in Brazil, Mexico, and the United States.
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Schist
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