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Antandrokomby pegmatite, Manandona Valley, Sahatany Pegmatite Field (Mt Ibity area), Vakinankaratra Region, Antananarivo Province, Madagascar

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Latitude & Longitude (WGS84): 20° 14' 25'' South , 47° 1' 18'' East
Latitude & Longitude (decimal): -20.2402777778, 47.0219444444


A complex type LCT pegmatite hosted in a metadolomite worked for gem tourmaline, spodumene and beryl from the beginning of the 20th century. Located near the village of Ambatolampy, about 35 kilometers south of Antsirabe, and in the Manandona Valley, south of the Ibity Massif (Mt.Ibity) in the central Highland of Madagascar. Administratively, the locality is located just outside the border of the Vakinankaratra Region and the Antananarivo Province, and therefore does not belong to these administrative and political units. But since the Antandrokomby pegmatite in all mineralogical literature is treated as belonging to the Sahatany Pegmatite Field - most of which is inside the region-border - it is sorted under that hierarchy here in Mindat. (Administratively and politically Antandrokomby is sorted under Ambositra District, Amoron'iMania Region, Fianaranatsoa Province.)

The pegmatite is a steeply dipping dike which measures 350 m x 1,2 meter.

NOTES on the mineral list:
- Some londonite-rhodizite specimens from the Antsongombato gem mine were sold as coming from Antandrokomby.

- Nizamoff et al. (2000) and Webber et al (2002) has shown that tourmalines from the miarolitic cavities at the Antandrokomby are members of the elbaite-schorl series with significant Mg and Ca content, and not liddicoatitic.

Mineral List


30 valid minerals. 3 (TL) - type locality of valid minerals. 1 erroneous literature entry.

Rock Types Recorded

Entries shown in red are rocks recorded for this region.

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



This page 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

Dabren A. (1906) Sur quelques pierres précieuses de Madagascar. Bulletin de L'Académie Malgache. Tananarive, 4:132-137 [First find of spodumene from Antandrokomby].

Lacroix, A. (1908) Les minéraux des filons de pegmatite á tourmaline lithique de Madagascar. Bulletin de la Société française de Minéralogie 31: 218-247.

Duparc, L., Wunder, M., Sabot, R. (1910) Les minéraux des pegmatites des environs d´Antsirabe á Madagscar. Mémoires de la Société de Physique et d'Histoire Naturelle de Geneve 36: 3: 283-407.

Lacroix, A. (1912) Sur quelques minéraux des pegmatites du Vakinankaratra (Madagascar). Bulletin de la Société française de Minéralogie, Paris 35: 76-84 [on danburite and rhodizite].

Lacroix, A. (1912) Sur une nouvelle espèce minérale (manandonite) des pegmatites de Madagascar. Bulletin de la Société française de Minéralogie 35: 223-226.

Lacroix, A. (1922) Minéralogie de Madagascar, Tome I. Géologie-Minéralogie descriptive. A. Challamel (Éditeur), Paris. 624p.

Behier, J. (1963) Carte minéralogique de Madagascar. Archive Service Géologique Madagascar. A 1871.

Ranorosoa, N., Fontan, F. & Fransolet, A-M. (1989) Rediscovery of manandonite in the Sahatany Valley, Madagascar. European Journal of Mineralogy 1: 633-638.

Ranorosoa, N. (1986) Étude minéralogique des pegmatites du champ de la Sahatany, Madagascar. Thèse de doctorat de L'Université Paul Sabatier, Toulouse.

Zheng, H. & Bailey, S.W. (1995) The crystal structure of manandonite-2H2. American Mineralogist 80: 387-393.

Pezzotta F., Falster A.U., Simmons W.B. & Webber K.L. (1997) Rhodizite from Madagascar, new localities and new chemical data. Abstracts of the First International Workshop on Petrology, Milan, Italy, September 11 to 13, 1997, Mus. Storia Nat. Sc. Nat.

Pezzotta, F. (1999) Madagaskar. Das Paradies der Mineralien und Edelsteine. Extra Lapis nr 17, pp 53-54 [German edition].

Nizamoff, J.W., Falster, A.U., Pezzota, F., Simmons, W.B., Hanson, S.L. and Webber, K.L. (2000) Recent mining at the Antandrokomby pegmatite, Madagascar. 26th Rochester Mineralogical Symposium. Rocks & Minerals, July 2000.

Nizamoff, J.W., Falster, A.U., Pezzota, F., Simmons, W.B. and Webber, K.L. (2000) Geochemical variation in tourmaline from Antandrokomby, Madagascar. 26th Rochester Mineralogical Symposium. Rocks & Minerals, July 2000.

Simmons, W.B., Pezzotta, F., Falster, A.U. & Webber, K.L. (2001) Londonite, a new mineral species: The Cs-dominant analogue of Rhodizite from the Antandrokomby granitic pegmatite, Madagascar. Canadian Mineralogist 39: 747-755.

Simmons, W.B., Webber, K.L., Falster, A.U., & Nizamoff, J.W. (2001) Gem tourmaline chemistry and paragenesis. Australian Gemmologist 21: number 01.

Webber, K.L. Simmons, W.B & Falster, A.U. (2002) Tourmaline from the Antandrokomby and Fianarantsoa Pegmatites, Madagascar. Mineralogical Record 33: 82.

Pezzotta, F., Diella, V. & Demartin, F. (2003) Londonit aus Madagaskar-eine neue Mineralart. Lapis 35(2): 35-38.

Yongkil Ahn, Jingyo Seo, Jongwan Park (2013) Electronic and vibrational spectra of tourmaline – The impact of electron beam irradiation and heat treatment. Vibrational Spectroscopy 65: 165-175 [Samples from Antandrokomby used in the study].

Frost, Ray L., López, Andrés, Xi, Yunfei, Scholz, Ricardo, Souza, Larissa, & Lana, Cristiano (2014) The molecular structure of the borate mineral rhodizite (K, Cs)Al4Be4(B, Be)12O28 – A vibrational spectroscopic study. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 128: 291-294. [Sample from Antandrokomby used in the study].

Mineral and/or Locality  
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