mineral
Quartz Geode
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, colors ranging from clear, white, to brownish-yellow due to iron impurities, vitreous to greasy 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, colors ranging from clear, white, to brownish-yellow due to iron impurities, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Forms within hollow cavities in sedimentary or igneous rocks where silica-rich groundwater percolates through, slowly depositing microscopic quartz crystals or larger macrocrystalline quartz over thousands to millions of years.
Uses & applications
Used in lapidary arts, specimen collecting, jewelry making, and industrial applications requiring pure silica.
Geological facts
Geodes start as bubbles in volcanic rock or nodules in limestone that become hollowed out and lined with inward-growing crystals over geologic time.
Field identification & locations
Easily identified by its outer rock rind enclosing a sparkling cavity filled with quartz crystals. Found worldwide, particularly in regions with limestone deposits or volcanic activity.
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Arenite (SiO2 based)
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Limonite / Goethite (Iron Ore Mineral nodule)
FeO(OH)·nH2O / FeO(OH)
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Septarian Pebble
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Schist
Schist
Metamorphic
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral