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There are four members of the taaffeite group:
Ferrotaaffeite-2N'2S: (Fe2+,Mg,Zn)3Al8BeO16
Ferrotaaffeite-6N'3S: BeFe2+2Al6O12
Magnesiotaaffeite-2N'2S: Mg3BeAl8O16
Magnesiotaaffeite-6N'3S: Mg2BeAl6O12
They are all multiple oxides.
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