Citation: Wildner, M.; Stoilova, D. (2003). Crystal structures and crystal chemical relationships of kroehnkite- and collinsite-type compounds Na2 Me(2+) (X O4)2 * 2(H2 O) (X = S, Me = Mn, Cd; and X = Se, Me = Mn, Co, Ni, Zn, Cd) and K2 Co (Se O4)2 * 2(H2 O). Zeitschrift fuer Kristallographie (149,1979-), 218, pp. 201-209.