ish·kyl·dite noun orish·kil·dite\ˈishkə̇lˌdīt\ (-s) Etymology: Russian ishkil'dit, from Ishkyldino, Middle Volga district, Union of Soviet Socialist Republics, its locality + Russian -it -ite : a mineral Mg15Si11O27(OH)20 consisting of a basic silicate of magnesium