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Lac Alaotra (Lake Alaotra), Alaotra-Mangoro Region, Toamasina Province (Tamatave), Madagascar

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Locality type:Lake
Name(s) in local language(s):Lac Alaotra, Faritra Alaotra-Mangoro, Faritanin'i Toamasina, Madagasikara

Lac Alaotra is situated about 180 km NE of the capitol Antananarivo, and is the biggest lake in Madagascar. Several mineral localities are found around the lake. In general the localities west and northwest of the lake belongs to the Amparafaravola District and the localities east and south of the lake belongs to the Ambatondrazaka District . Several LCT pegmatites of the Beryl-Columbite subtype are located east of the lake, and LCT pegmatites of the Chrysoberyl subtype southeast of the lake.

Minerals from these localities has often been brought to the market in the town Ambatondrazaka. Thus minerals from this region are often labelled "Ambatondrazaka" or "Lake Alaotra". For chrysoberyl specimens see especially the localities Andreba, Ambatosoratra, Masiadrivotra and Ampanorana Est .

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8 valid minerals.

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Pezzotta, F.(1999): Madagaskar- Das Paradies des Mineralien und Edelsteine. ExtraLApis no.17,47-48 [german version]

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