The mineral fluorannite, a new member in trioctahedral micas, has been approved by the Commission on New Minerals and Mineral Names (CNMMN) in 1999. Here a room-temperature Mössbauer data of this new mineral from Suzhou, China was reported and interpreted in terms of quadrupole splitting distributions (QSDs). Based on QSD analysis, the overall of QSDs at 298 K can be interpreted in terms of four QSD contributions centered at QS = 2.571 mm/s for Fe2+-O4(OH)2 octahedra (cis and trans not resolved), QS = 2.255 mm/s for Fe2+-O4(OH)F octahedra (cis and trans not resolved), QS = 2.166 mm/s for cis-Fe2+-O4F2 octahedra, and QS = 1.278 mm/s for trans-Fe2+-O4F2 octahedra. The ferric iron spectral component with CS = 0.378 mm/s and QS = 0.645 mm/s was also characterized.

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