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The ferrotaaffeite subgroup of the
taaffeite group has two members:
Formulae:
Ferrotaaffeite-2N'2S:
(Fe2+,Mg,Zn)3Al8BeO16, hexagonal, 3.99 calculated
Ferrotaaffeite-6N'3S:
BeFe2+2Al6O12, trigonal, specific gravity 4.07 calculated
They are both multiple oxides.
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