(Cap Andrahomana, Departemanta 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.
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. (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
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Mineral List:18 entries listed. 12 valid minerals. 1 type locality (valid mineral).
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