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Ilakaka gem deposit, Ilakaka Commune, Ranohira District, Horombe Region, Fianarantsoa Province, Madagascar

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An alluvial gem gravel deposit discovered 1998. One of the largest sapphire deposits in the world. It is located Close to the route national 7 going to Tulear, in the Horombe region in the southwestern part of Madagascar.
A large number of new gem deposits of the same character has also been discovered in the area around Ilakaka and further southwest in the Sakaraha area (see http://www.mindat.org/loc-45924.html). There is also a third district near Bezaha close to the Onillahy River 118 km southwest of Ilakaka.(see http://www.mindat.org/loc-217183.html)

NOTE: the name "Ilakaka" in the litterature refers not only to the Ilakaka deposit, but also sometimes to the whole gem deposit area.

Mineral List



15 entries listed. 9 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. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org 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.

References

Schmetzer, K.(1999): Rubine und verschiedenfarbige Saphire aus Ilakaka, Madagaskar. Lapis 24(6), 46-47.

Schmetzer, K., Glas, M. & Bernhardt, H-J. (2002): Sterngranate aus Madagaskar. Lapis 27 (2), 20-27

Hogg, Jonny (2007): Madagascar's sapphire rush. BBC News, 17 November 2007.

Giuliani, G., Fallick, A., Rakotondrazafy, M., Ohnenstetter, D., Andriamamonjy, A., Ralantoarison, T., Rakotosamizanany, S., Razanatseheno, M., Offant, Y., Garnier, V., Dunaigre, C., Schwarz, D., Mercier, A., Ratrimo, V., and Ralison, B. (2007): Oxygen isotope systematics of gem corundum deposits in Madagascar: relevance for their geological origin. Mineralium Deposita 42, 251-270.


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