(Cap Andrahomana, Distrikan'i Ranopiso, Faritra Anosy, Faritany Toliary, Madagasikara)
Cap Andrahomana is situated WSW of the town Fort Dauphin (Taolanaro), at the southernmost point of the mountainrange Chaînes Anosyennes. This is the type locality of grandidierite, where it was found in 1902 in a small pegmatite as up to 8 cm long crystals.
According to Behier (1960) C. Mignot who searched for the site, and found it (in 1960), could not find any more grandidierite at the site.
The pegmatite cross-cuts migmatitic high-grade granulite-facies (800 °C, 5-5.5 kb, 561 +/-12 Ma)metapelite gneisses and leptynites.
References:
- Lacroix, A. (1902): Note préliminaire sur une nouvelle espèce minerale. Bulletin de la Société Francaise de Minéralogie 25: 85-86
- Lacroix, A. (1922): Mineralogie de Madagascar, Tome I. Géologie-Minéralogie descriptive. A.Challamel (Éditeur), Paris. 624p
Behier, J. (1960): Travaux mineralogiques. in Besaire,H. (ed): Rapport Annuel du Service Geologique pour 1960. Republique Malgache, 181-199 [p. 194, note on a search for grandidierite in 1960]
- Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Géologique Madagascar. A 1871
- Eur. J. Minéral; , 1991, 3, pp.367-386
- Grew, E. S.; Yates, M. G. ; Huijsmans, J. P. P. ; McGee, J. J.; Shearer, C. K.; Wiedenbeck, M. & Rouse, R. C. (1998): Werdingite, a borosilicate new to granitic pegmatites, The Canadian Mineralogist 36, 399-414
Mineral List:18 entries listed. 12 valid minerals. 1 type locality (valid mineral).
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