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A new fluorine-dominant titanium calcium amphibole (FTCA) was found in alkali basalts of the Rothenberg volcano situated in the Eifel paleovolcanic region, Rhineland-Palatinate (Rheinland-Pfalz), Germany. The empirical formula based on 24 (O+F) atoms is (Na 0.65 K 0.30 )(Ca 1.95 Na 0.05 )(Mg 3.36 Fe 3+  0.87 Fe 2+  0.13 Ti 0.60 )(Si 5.92 Al 2.08 )O 22 (F 1.11 O 0.89 ). The crystal structure has been studied based on single-crystal X-ray diffraction data. The monoclinic unit-cell parameters are:  a =9.8684(2) Å,  b =18.0457(3) Å,  c =5.3113(1) Å,  β =105.543(3)°; space group  C 2/ m . The structure was refined to  R =3.39% in anisotropic approximation using 3661 F &gt;4σ F . The studied mineral is the first representative of F-dominant amphiboles with   C  Ti&gt;0.5. It is considered as a F-dominant analogue of ferri-kaersutite NaCa 2 [Mg 3 Fe 3+ Ti](Si 6 Al 2 O 22 )O 2 .

The crystal structure of a fluorine-dominant titanium calcium amphibole from the Eifel paleovolcanic area, Germany