Abstract: The first occurrence of mpororoite and anthoinite outside the African Continent has been found in an altered skarn from the Kara mine, Tasmania, forming a white powdery mixture of the two minerals pseudomorphing scheelite. The wet chemical analysis of the mixture shows WO₃, Al₂O₃, and H₂O to be the essential constituents, proving the non-essential nature of Fe₂O₃ in mpororoite; the original mpororoite contained high Fe₂O₃ substituting for Al₂O₃. The thermal treatment of the mixture at 100°C for 6 hours in air brings about the conversion of mpororoite into anthoinite, which re-hydrates into mpororoite, although the associated anthoinite does not. The source of Al is ascribed to the decomposition of aluminian andradite in the skarn.