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Tsaramanga (Tongafeno) pegmatite, Mahaiza Commune, Betafo District, Vakinankaratra Region, Antananarivo Province, Madagascar

Photo: K.E.Larsen
Tsaramanga (Tongafeni; Itongafeno), Kaominina Mahaiza, Distrikan' i Betafo, Faritra Vakinankaratra, Faritanin' Antananarivo, Madagasikara

The Tsaramanga or the “Tongafeno” granite pegmatite is hosted in coarse grained gabbro stock ("Gabbro de l’ Itsindro”, intrusive complex of Ambatofinandrahana). It can be classified after Pezzotta (1999) as a LCT beryl columbite subtype pegmatite.
Known for blue beryl (Santamaria-type), rose quartz and good crystals of columbites.
X = 439,935
Y = 684,606
15OO m NW of Itongafeno Mt, near the old village of Tsaramanga

Mineral List

Aeschynite-(Y)
'Almandine-Spessartine Series'
Beryl
Biotite
Bismite
Bismutite
Columbite
Columbite-(Mn)
'Columbite-Tantalite'
Epidote
Euxenite-(Y)
Magnetite
Microcline
Molybdenite
Monazite-(Ce)
Pucherite
'Pyrochlore Supergroup'
var: Betafite (of Hogarth 1977)
Quartz
var: Amethyst

var: Rose Quartz
Rutile
var: Ilmenorutile
var: Strüverite
Samarskite-(Y)
Spessartine
'Tourmaline'
Zircon
var: Cyrtolite
var: Malacon


29 entries listed. 16 valid minerals.

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References

- Lacroix, A. (1912): Sur un groupe de niobotantalates cubiques, radioactifs, des pegmatites du Vakinankaratra . Bulletin de la Société française de Minéralogie, Paris 35 , 85-92 [on "blomstrandite" = betafite]
- Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Géologique Madagascar. A 1871.
- Pezzotta, F. (1999): Madagaskar. Das Paradies der Mineralien und Edelsteine. Extra Lapis nr 17, pp 53-54 (german edition)
- Rakotoarisoa Nivomalala (2003): Contribution á l' etude monographique des gites pegmatitiques de la region de Betafo-Antsirabe. Interpretation structurale d' images Landsat. Ecole Supérieure Polytechnique d'Antananarivo 2003

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Copyright © Jolyon Ralph and Ida Chau 1993-2012. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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