mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, transparent to translucent with a vitreous (glassy) luster, colorless or white, hexagonal crystal system, conchoidal fracture with no distinct cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, transparent to translucent with a vitreous (glassy) luster, colorless or white, hexagonal crystal system, conchoidal fracture with no distinct cleavage.
Formation & geological history
Formed within hollow cavities in sedimentary or volcanic rocks where silica-rich groundwater precipitated microcrystalline or macrocrystalline quartz over millions of years.
Uses & applications
Commonly used in mineral collections, decorative items, lapidary arts, and sometimes in jewelry making.
Geological facts
Geodes start as bubbles in volcanic rock or animal burrows in sedimentary layers, slowly filling with mineral-rich water to form crystal linings.
Field identification & locations
Easily identified by its sparkling crystal interior cavity and hard exterior matrix; found worldwide in limestone deposits and volcanic regions.
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