AÃÂ geodeÃÂ fromÃÂ Ancient GreekÃÂ word meaning earthlike is aÃÂ geologicalÃÂ secondary formation withinÃÂ sedimentaryÃÂ andÃÂ volcanic rocks. Geodes are hollow, vaguely spherical rocks, in which masses ofÃÂ mineralÃÂ matter which may include crystals are secluded. The crystals are formed by the filling ofÃÂ vesiclesÃÂ in volcanic andÃÂ sub-volcanicÃÂ rocks by minerals deposited fromÃÂ hydrothermal fluids; or by the dissolution of syn-genetic concretions and partial filling by the same, or other, minerals precipitated from water,ÃÂ groundwaterÃÂ or hydrothermal fluids.
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