Manganoeudialyte is an moderately rare mineral of the eudialyte group,[2] with formula Na14Ca6Mn3Zr3Si2[Si24O72(OH)2]Cl2·4H2O.

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.

[3][5] Manganoeudialyte was discovered in khibinites of the Poços de Caldas massif, Brazil.

[3] Associated minerals are aegirine, analcime, astrophyllite, cancrinite, fluorite, lamprophyllite, nepheline, potassium feldspar, rinkite, sodalite, and titanite.

[2] Impurities in manganoeudialyte include strontium, potassium, niobium, aluminium, fluorine, and minor hafnium, cerium, and lanthanum.