Tourmalines from Antandrokomby are members of the schorl-elbaite series with significant Mg and Ca contents. (Australian Gemmologist, Vol 21 (2001) nr 1
Quality of samples:
Good crystals or rich for species - important (!)
Rarity at site:
Common
Confirmation
Validity:
Believed Valid
References
References:
Ranorosoa, N (1986) : Etude mineralogique des pegmatites du champ de la Sahatany, Madagscar. These de doctorat, Toulouse