A thorianite deposit situated east of the town Tranomaro in the southeastern part of Madagascar. Delbos found here in 1954 crystals of hibonite in a plagioclasite embedded in a pyroxenite. The hibonite -bearing rock formed a 50 cm thick vein which was, at the time possible to follow for several 10s of meters. This was the 2. known locality for this species.
References:
Delbos, L. (1955): Note sur le gisement d'un mineral nouveau " la hibonite" de' l'Androy Mandrareen" in Rapport Annuel du Service Geologique pour 1955, Tananarivo.143-144
Mineral List:7 entries listed. 4 valid minerals.
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