Perhaps a possible misidentification of clinobisvanite ?? (not analysed, just listed in Ranorosoa (1986))
Quality of samples:
not specified / average specimens
Confirmation
Validity:
Unconfirmed/Questioned
References
References:
Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse