A complex type LCT pegmatite hosted in a metadolomite worked for gem tourmaline, spodumene and beryl from the beginning of the 20th century. Located in the Manandona Valley, south of the Ibity Massif (Mt.Ibity) in the central Highland of Madagascar. Adminstratively the locality is located just outside the border of the Vakinankaratra Region and the Antananarivo Province,and therefore not belongs to these administrative and political units. But since the Antandrokomby pegmatite in all mineralogical litterature is treated as belonging to the Sahatany Pegmatite Field - which most of it are inside the region-border - it is sorted under that hierarchy here in Mindat. (Administratively and politically Antandrokomby is sorted under Ambositra Department, Amoron'iMania Region, Fianaranatsoa Province)
NOTE: Some londonite-rhodizite specimens from the Antsongombato gem mine were sold as coming from here.
References:
- Lacroix, A. (1912): Sur quelques minéraux des pegmatites du Vakinankaratra (Madagascar). Bulletin de la Société francaise de Minéralogie, Paris 35 , 76-78 (on danburite and rhodizite)
- Lacroix, A. (1922-23): Minéralogie de Madagascar.Paris Tome I-III.
- Extra Lapis nr 17.Madagaskar, pp 53-54 (german edition)-
- Ranorosoa, N.(1986): Etude mineralogique des pegmatites du champ de la Sahatany,Madagascar. These de doctorat, Toulouse
- Simmons, W.B; Pezzotta,F; Falster, A.U & Webber, K.L.(2001): Londonite, a new mineral species: The Cs-dominant analogue of Rhodizite from the Antandrokomby granitic pegmatite, Madagascar. Canadian Mineralogist 39: 747-755
- Simmons, W.B., Webber, K.L., Falster, A.U., & Nizamoff, J.W. (2001): Gem tourmaline chemistry and paragenesis. Australian gemmologist 21, number 01.
