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Mananjary emerald District, Mananjary District, Vatovavy-Fitovinany Region, Fianarantsoa Province, Madagascar
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Emeralds was first reported found in this area in the beginning of the 1960s. Emeralds colored by vanadium instead of chromium. The emerald mineralisation occurs in phlogopite in contact between pegmatite and basic/ultrabasic rocks. The emeralds were formed cause to metasomatic processes related to the Pan-African tectonometamorphic event. The area has been divided by Cheilletz et al. in 2 zones: A north zone and a south zone.

Mineral List

Mineral list contains entries from the region specified including sub-localities
Actinolite
'Albite-Anorthite Series'
'Apatite'
Baryte
Beryl
var: Emerald

'Biotite'
Calcite
'Chlorite Group'
Chrysoberyl
var: Alexandrite

Diopside
Dolomite
Edenite
Fluorite
'Garnet'
Goethite
Hematite
'Hornblende'
Ilmenite
'K Feldspar'
Molybdenite
Muscovite
var: Sericite

Phenakite
Phlogopite
Pyrite
Quartz
Rutile
'Scapolite'
Spessartine
Spinel
Talc
Titanite
'Tourmaline'
Tremolite
'Wolframite'


50 entries listed. 21 valid minerals.

Localities in this Region

Madagascar
Madagascar

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References

- Grundmann, G. (2001): Die Smaragde der Welt. ExtraLapis 21: 26-37 [german version]

- A. Cheilletz et al.: OS06 : TUpm30 : G5 : Emerald Deposits in Madagascar: Two Differents Types for one Mineralising Event:EUG XI.Symposium OS06 Mineralogy, Ore Geology and Mineral Resources.; see http://www.the-conference.com/JConfAbs/6/OS06.pdf

- Moine, B. et al. (2004): Comptes Rendus Geosciences 336, 513-522. (in French)

- Groat, L.A., Giuliani, G., Marshall, D.D., and Turner, D. (2008): Emerald deposits and occurrences: A review. Ore Geology Reviews 34, 87-112.

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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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