noun
or ish·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 Mg 15 Si 11 O 27 (OH) 20 consisting of a basic silicate of magnesium