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Antandrokomby pegmatite, Manandona Valley, Sahatany Pegmatite Field (Mt Bity (Ibity) area), Vakinankaratra Region (Betafo - Antsirabé region), Antananarivo Province, Madagascar

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.





Mineral List:
  • Albite
  • Anatase
  • Arsenic
  • Autunite
  • Behierite
  • Beryl
  • Bismuth
  • Clinobisvanite
  • 'Clinoptilolite'
  • Columbite-(Mn)
  • Danburite
  • Elbaite
       var: Rubellite
  • Hambergite
  • Hübnerite
  • Liddicoatite
  • Londonite (TL)
  • Manandonite (TL)
  • Microcline
  • Monazite-(Ce)
  • Opal
  • Quartz
  • Rhodizite
  • Scheelite
  • Schorl
  • Spessartine
  • Spodumene
  • Tantalite-(Mn)
  • 'Tourmaline Group'
  • Uranmicrolite
  • Zircon
    var: Hafnian Zircon


    31 entries listed. 27 valid minerals. 2 type localities (valid minerals).

    The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database!
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