per correspondence with Knut Edvard: The TL produced just a few specimens in the year of discovery (also an eluvial locality ). When lacking exact locality data the Madagascar hibonite specimens are often erroneously labeled and sold as coming from Esiva, often being the only locality referred to in textbooks.
Quality of samples:
not specified / average specimens
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