mineral
Polished Agate (Green and White Chalcedony)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Hardness 6.5-7 on Mohs scale; vitreous to waxy luster; trigonal crystal system (microcrystalline/cryptocrystalline); soft olive green and creamy white color banding; smooth tumbled finish.
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Physical properties
Hardness 6.5-7 on Mohs scale; vitreous to waxy luster; trigonal crystal system (microcrystalline/cryptocrystalline); soft olive green and creamy white color banding; smooth tumbled finish.
Formation & geological history
Forms in volcanic and sedimentary rocks as silica-rich fluids fill rock cavities (geodes or vesicles) layer by layer over millions of years.
Uses & applications
Popular for lapidary arts, jewelry making, decorative tumbled stone collections, and metaphysical or meditation practices.
Geological facts
Agate is named after the Achates River (now the Dirillo River) in Sicily, where it was first discovered in ancient times.
Field identification & locations
Identified by its distinctive color banding and hardness (does not scratch with a copper penny or steel knife). Found in volcanic regions worldwide including Brazil, Madagascar, and the USA.
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