mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale. Color ranges from clear/white to grayish, vitreous to sparkly luster, trigonal 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. Color ranges from clear/white to grayish, vitreous to sparkly luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Formed within hollow cavities in sedimentary or volcanic rocks where silica-rich groundwater circulates and deposits microcrystalline or macrocrystalline quartz over long periods.
Uses & applications
Used in mineral collections, decorative items, and occasionally lapidary work.
Geological facts
Quartz is one of the most abundant minerals in Earth's continental crust and is well known for its piezoelectric properties.
Field identification & locations
Can be identified by its high hardness (scratches glass) and sparkly crystal faces inside a darker host rock matrix.
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