The name Vohidahy covers 6 different LCT pegmatites close to Mount Vohidahy, which at last 3 of them has been worked for polychromatic tourmalines and beryl. The largest and most important is situated in a ravine SE of Mount Vohiday. A second pegmatite is found on the eastern flanc of Mt.Vohidahy, 50 m SW of the first locality. The third is situated in a ravine on the western flanc of Mt.Vohidahy, about 350 m NW of the first one. The 3 other pegmatites is found about 400 m N of the first one.
References:
A.Lacroix (1922):Mineralogie de Madagascar. I
Rakotoarison, W (1964): Les pegmatites de la Sahatany. Serv.Geol.Mad. Archiv. 1983