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Anjanabonoina pegmatites, Ambohimanambola Commune, Betafo District, Vakinankaratra Region, Antananarivo Province, Madagascar

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Latitude & Longitude (WGS84): 19° 55' South , 46° 32' East
Latitude & Longitude (decimal): -19.91667,46.53333
Köppen climate type:Cwb : Subtropical highland climate or temperate oceanic climate with dry winters
Name(s) in local language(s):Anjanabonoina, Kaominina Ambohimanambola, Distrikan' i Betafo, Faritra Vakinankaratra, Faritanin' Antananarivo, Madagasikara

The Anjanabonoina pegmatites are famous for their large and multicolored tourmalines. Located 42 km WSW of the town Betafo in the central highland of Madagascar.

These pegmatite dikes outcrop at a hill (with an elevation of about 1,400 meters) 2,5 km east of Mount Ikaka and are emplaced in a complex environment characterized by paragneiss, marble and orthogneiss of the Neoproterozoic Itremo Group, of medium metamorphic grade. The subhorizontal bodies of pegmatite are strongly zoned. The metasedimentary rocks hosting the pegmatitic dikes locally show extensive contact-metasomatic phenomena. Abundant tourmalization extensively affected schist and quartzite units, with schorl-dravite replacing up to 30% of the rock volume. Veins of quartz, dravite-schorl and danburite are locally present in metasedimentary rocks close to the pegmatites, and marble is transformed into skarn (De Vito et al. 2006).

- Locality mispelled as "Anjanabonsana" in Lacroix (1909).

Mineral List

Mineral list contains entries from the region specified including sub-localities

29 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

Ectasian - Calymmian
1200 - 1600 Ma

ID: 3184647
Mesoproterozoic crystalline metamorphic rocks

Age: Mesoproterozoic (1200 - 1600 Ma)

Lithology: Crystalline metamorphic rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

Localities in this Region

  • Antananarivo Province
    • Vakinankaratra Region
      • Betafo District
        • Ambohimanambola Commune

This page contains all mineral locality references listed on 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. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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Lacroix, A. (1908): Les minéraux des filons de pegmatite á tourmaline lithique de Madagascar. Bulletin de la Société Francaise de Minéralogie 31: 218- 247 [with notes on tourmaline from Anjanabonoina]
Lacroix, A. (1909): Sur la hambergite de Madagascar. Bulletin de la Société française de Minéralogie, Paris. 32, 320-324
Lacroix, A. (1922-23): Minéralogie de Madagascar. Tome I-III, A. Challamel (Éditeur), Paris.
Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Géologique Madagascar. A 1871
Switzer, G., Clarke jr, R.S, Sinkankas, J. and Worthing, H.W. (1965): Fluorine in hambergite. American Mineralogist 50: 85-95 [with analysis on hambergite from Anjanabonoina]
Bancroft, P.: Gem & Crystal Treasures. Published by Western Enterprises/Mineralogical Rercord, 488p. [On Anjanabononia : p 322-325]
Strunz, H. (1979): Anjanabonoina, Fundort schönnnnnnnster Tourmaline. Lapis: 4: 24-27, 47-48.
Wilson, W. E. (1984): What's new in Minerals ? Munich show 1983. Mineralogical Record 15: 118 [on a find of phenakite]
Wilson, W. E. (1989): The Anjanabonoina pegmatite, Madagascar. Mineralogical Record 20: 191-200
Pezzotta, F. (1999): Madagaskar- Da Paradies der Mineralien und Edelsteine. Extra Lapis 17. 56-59 (german version).
De Vito, C., Aurisicchio, C., Ferrini, V., and Pezzotta, F. (2002a): Nb-Ta oxides from Anjanabonoina pegmatite. International Mineral. Assoc. 18th General Meeting (Edinburgh), Program Abstract: 275.
De Vito, C., Aurisicchio, C., Ferrini, V., and Pezzotta, F. (2002b): Chemical composition and B, O and H isotopes of tourmaline from Anjanabonoina pegmatite. International Mineral. Association, 18th General Meeting (Edinburgh), Program Abstract: 208.
Dini, A., Tonarini, S., Pezzotta, F., and De Vito, C. (2002) Boron isotopes study of borates and boro-silicates from Anjanabonoina and Tetezantsio pegmatites (central Madagascar). International Mineral. Association, 18th General Meeting (Edinburgh), Program Abstract: 210.
Dirlam, D.M., Laurs, B.M., Pezzotta, F., and Simmons, W.B. (2002): Liddicoatite tourmaline from Anjanabonoina, Madagascar. Gems and Gemology: 38: 28-52.
De Vito, C., Pezzotta, F., Ferrini, V., and Aurisicchio, C. (2006): Nb-Ti-Ta oxides in the gem-mineralized and "hybrid" Anjanabonoina granitic pegmatite, central Madagascar: A record of magmatic and postmagmatic events. Canadian Mineralogist: 44: 87-103.
Ertl, A., Hughes, J. M., Prowatke, S., Ludwig, T., Prasad, P. S. R., Brandstätter, F., Körner, W., Schuster, R., Pertlik, F. and Marschall, H. (2006): Tetrahedrally coordinated boron in tourmalines from the liddicoatite-elbaite series from Madagascar: Structure, chemistry, and infrared spectroscopic studies. Am. Mineral. 91, 1847-1856. [both F-dominant]
Lussier, A. J., Abdu, Y., Hawthorne, F. C., Michaelis, V. K., Aguiar, P. M. and Kroeker, S. (2011): Oscillatory zoned liddicoatite from Anjanabonoina, central Madagascar. I. Crystal chemistry and structure by SREF and 11B and 27Al MAS NMR spectroscopy. Canadian Mineralogist 49, 63-88. [F-dominant]
Lussier, A. J. & Hawthorne, F. (2011): Oscillatory zoned liddicoatite from Anjanabonoina, central Madagascar. II. Compositional variation and mecanisms of substitution. Canadian Mineralogist 49, 89-103.

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