Ilakaka gem deposit, Ilakaka Commune, Ihosy District, Ihorombe Region, Fianarantsoa Province, Madagascar
|Latitude & Longitude (WGS84):||22° 42' 12'' South , 45° 13' 12'' East|
|Latitude & Longitude (decimal):||-22.70336,45.22001|
|Köppen climate type:||Cfa : Humid subtropical climate|
|Name(s) in local language(s):||Fitrandrahana safiran' Ilakaka, Kaominin' Ilakaka, Distrikan' Ihosy, Faritra Ihorombe, Faritanin'i Fianarantsoa, Madagasikara|
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. There is also a third district near Bezaha close to the Onillahy River 118 km southwest of Ilakaka.
NOTE: the name "Ilakaka" in the litterature refers not only to the Ilakaka deposit, but also sometimes to the whole gem deposit area.
Commodity ListThis is a list of exploitable or exploited mineral commodities recorded at this locality.
10 valid minerals.
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 Macrostrat.org
0 - 2.588 Ma
145 - 201.3 Ma
|Mesozoic sedimentary rocks|
Age: Jurassic (145 - 201.3 Ma)
Lithology: Sedimentary 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.