Betpakdalite-FeFe
Betpakdalite-FeFe is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula [Fe³⁺₂(H₂O)₁₅(OH)₂Fe³⁺(H₂O)₆][Mo₈As₂Fe³⁺₃O₃₇].
It crystallizes in the monoclinic crystal system (space group C2/m). It is a member of the Betpakdalite structural group.
IMA symbol Bpd-FeFe, IMA status: approved, named in 2017.
The name refers to the Bet-Pak-Dal Desert, Kazakhstan. Two suffixes correspond to the dominant cations in the two different types of non-framework cation sites.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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