Ampangabéite
A synonym of Samarskite-(Y)
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About Ampangabéite
Formula:
(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
Name:
After the locality at Ampangabé, Madagascar.
Synonym:
A synonym of Samarskite-(Y)
First described as a new mineral, an U-REE niobotantalate related to samarskite-(Y) by the French mineralogist Alfred Lacroix in 1912.
Now discredited.
Analysis of ampangabeite from different localities in the Berere pegmatite field, Madagascar, by M. Wilson (director of Syndicat Lyonnais de Madagascar), cited from Behier (1960):
Van Wambeke (1960) observed that ampangabeite shows three visually distinct zones: a) an internal non-altered zone, with black colour and conchoidal fracture b) a intermediate altered zone of brownish to red brownish colour and c) an external heavily altered zone. The colour varies from yellowish-brown to honey yellow.
Van Wambeke (1960) showed that ampangabeite should be classified as an altered samarskite.
Now discredited.
Analysis of ampangabeite from different localities in the Berere pegmatite field, Madagascar, by M. Wilson (director of Syndicat Lyonnais de Madagascar), cited from Behier (1960):
Chemical analysis of ampangabéite | ||||||||||||||||||||||||||||||||||||||||
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Van Wambeke (1960) observed that ampangabeite shows three visually distinct zones: a) an internal non-altered zone, with black colour and conchoidal fracture b) a intermediate altered zone of brownish to red brownish colour and c) an external heavily altered zone. The colour varies from yellowish-brown to honey yellow.
Van Wambeke (1960) showed that ampangabeite should be classified as an altered samarskite.
Name Encoding
ASCII-7:
Ampangabeite
Unique Identifiers
Mindat ID:
8409 (as Ampangabéite)
3512 (as Samarskite-(Y))
3512 (as Samarskite-(Y))
Long-form identifier:
mindat:1:1:8409:9 (as Ampangabéite)
mindat:1:1:3512:1 (as Samarskite-(Y))
mindat:1:1:3512:1 (as Samarskite-(Y))
Internet Links for Ampangabéite
mindat.org URL:
https://www.mindat.org/min-8409.html
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References for Ampangabéite
Reference List:
Lacroix, Alfred (1912) Sur les minéraux de la pegmatite d'Ampangabé et de ses environs (Madagascar) et en particulier sur un minéral nouveau (ampangabéite) [On the minerals of the pegmatite of Ampangabé and its surroundings (Madagascar) and in particular on a new mineral (ampangabéite)]. Bulletin de Minéralogie, 35 (4). 180-199 doi:10.3406/bulmi.1912.3513
Tschernick, Georges (1926) Recherches sur la composition chimique de deux minéraux de Madagascar, l'ampangabéite et la columbite. Bulletin de Minéralogie, 49 (3) 127-135 doi:10.3406/bulmi.1926.4307
Ampangabé pegmatite, Miandrarivo, Faratsiho, Vakinankaratra, Madagascar