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Betroka District, Anosy Region (Fort Dauphin Region), Tuléar Province (Toliara), Madagascar

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Location is approximate, based on center of defined region.
Latitude & Longitude (WGS84): 23° 22' 4'' South , 45° 52' 35'' East
Latitude & Longitude (decimal): -23.36805,45.87666
Neighbouring regions:
Name(s) in local language(s):Distrikan'i Betroka, Faritra Anosy, Faritanin'i Toliary, Madagasikara

In the mineralmarkets of Antsirabe, occasionally gemmy, green single crystals of diopside coming from Betroka are erronously sold as kornerupine, which also occurs in the district

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.

Mineral List

Mineral list contains entries from the region specified including sub-localities

43 valid minerals.

Rock Types Recorded

Note: this is a very new system on and data is currently VERY limited. Please bear with us while we work towards adding this information!

Rock list contains entries from the region specified including sub-localities

Select Rock List Type

Alphabetical List Tree Diagram


Mineralization age: Furongian : 490 ± 20 Ma to 487 ± 4 Ma

Important note: This table is based only on rock and mineral ages recorded below and is not necessarily a complete representation of the geochronology, but does give an indication of possible mineralization events relevant to this locality. As more age information is added this table may expand in the future. A break in the table simply indicates a lack of data entered here, not necessarily a break in the geologic sequence. Grey background entries are from different, related, localities.

Geologic TimeRocks, Minerals and Events
ⓘ Biotite487 ± 4 MaAmbatomena ruby deposit, Isoanala Commune, Betroka District, Anosy Region (Fort Dauphin Region), Tuléar Province (Toliara), Madagascar
ⓘ Thorianite490 ± 20 Ma
ⓘ Zircon490 ± 20 MaItrongay (Itrongahy), Mahasoa Est Commune, Betroka District, Anosy Region (Fort Dauphin Region), Tuléar Province (Toliara), Madagascar

Localities in this Region

This page contains all mineral locality references listed on 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 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.
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