geyseritePronunciation: /ˈgiːzərʌɪt, ˈgʌɪ-/Definition of geyserite noun [mass noun] a hard opaline siliceous deposit occurring around geysers and hot springs. Origin: early 19th century: from geyser + -ite1geyserite in other Oxford dictionaries Definition of geyserite in the US English dictionary