What is "manganoeudialyte"

Manganoeudialyte is an moderately rare mineral of the eudialyte group, with formula NaCaMnZrSi[SiO(OH)]Cl·4HO. The formula given is one of the forms that can be given, based on the originally reported one, and shows dominance of silicon at both the M3 and M4 sites. As suggested by its name, it is the manganese-analogue of eudialyte.