Citation: Rozhdestvenskaya, I.V.; Bannova, I.I.; Timoshenko, T.I.; Barbanyagre, V.D.; Shamshurov, V.M. (1995). Refinement of the Ca2 (Al,Zn)(Si,Al)2 O7 crystal structure. Isomorphism in the structures of the helenite-hardystonite series. Kristallografiya, 40, pp. 681-683.
Formula: Al1.25 Ca1.94 O7 Si1.38 Zn0.43
Chemical name:(Ca0.97 Zn0.03)2 (Al0.63 Zn0.37) (Si0.69 Al0.31)2 O7