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Mn 2+ -bearing eleonorite from the Hagendorf South pegmatite situated south of Waidhaus, Upper Palatinate, Bavaria, Germany was study based on single crystal X-ray analysis, Mn and Fe  K -edge XANES spectroscopy, as well as IR spectroscopy. According to spectroscopic data, all Mn is bivalent, and all Fe is trivalent. The empirical formula of the mineral is (Mn 2+  0.58 Zn 0.13 Mg 0.04  Fe 3+  5.24 ) Σ5.98 (PO 4 ) 4 (H 2 O,OH,O) 11 . The monoclinic unit-cell parameters are:  a =20.832(3) Å,  b =5.1569(3) Å,  c =19.200(2) Å, β=93.01(1)°; space group  C 2/ c . The structure was refined to  R  1 =5.20% in anisotropic approximation using 1994 reflections with  I &gt;3σ( I ). Despite in most beraunite-group minerals  M 1-site demonstrates selective accumulation of bivalent cations, in Mn-bearing eleonorite Mn 2+ -cations are disordered between octahedral sites without statistical predominance anywhere; all octahedral  M (1–4)-sites are predominantly occupied by Fe 3+ .  M 1-site is half-occupied by Fe 3+  and contains subordinate Mn 2+  and minor Zn 2+  and Mg 2+ . Based on the new data we suppose that Mn-bearing eleonorite was formed as a secondary phase as a result of oxidation of a primary Mn-bearing beraunite-group mineral in with Mn 2+  was initially distributed between different  M  sites.

zeitschrift für kristallographie - crystalline materials 

Mn-bearing eleonorite from Hagendorf South pegmatite, Germany: crystal structure and crystal-chemical relationships with other beraunite-type phosphates