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Ilakaka gem deposit, Ilakaka Commune, Ranohira District, Horombe Region, Fianarantsoa Province, Madagascar
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Photo: K.E.Larsen
Latitude: 22°41'53"S
Longitude: 45°13'4"E
 
 
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

'Almandine-Pyrope Series'
Andalusite
Beryl
Chrysoberyl
Chrysoberyl
var: Alexandrite

Corundum
var: Sapphire

Elbaite
'Garnet'
Kyanite
Quartz
var: Amethyst
Spinel
Topaz
'Tourmaline'
Zircon


15 entries listed. 9 valid minerals.

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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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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. 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 thousands 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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