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A titanosilicate closely allied to Mosandrite and Johnstrupite (q.v.)—Na₉Ca₁₁Ce₃(Ti,Th)₄₁Si₁₂O₄₆? Cer = 21; Yttr = 0·4-1·4; TiO₂ = 13-14%.

Monoclinic, very close to Johnstrupite.

G = 3·46. H = 5. Yellow, pleochroic; translucent.

Kangerdluarsuk, Greenland.