Gagarinite-(Eu) Frank-Kamenetskaya O V, Fundamenskii V S, Tsytsenko A K, Frank-Kamenetskii V A Crystallography Reports 39 (1994) 923-928 Crystal structure of gagarinite from precision X-ray data: Structural changes in the NaCaTRF6-Na1.5TR1.5F6 series Locality: ultra-alkaline rare-metal feldspar pegmatites from eastern Siberia _database_code_amcsd 0012345 6.0403 6.0403 3.5899 90 90 120 P6_3/m atom x y z occ B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3) Na1 0 0 .962 .189 .008040 .008040 .028710 .004020 0 0 Na2 0 0 .284 .090 .005573 .005573 .025218 .002741 0 0 Ca 2/3 1/3 .25 .498 .005573 .005573 .012221 .002832 0 0 Eu 2/3 1/3 .25 .299 .005573 .005573 .012221 .002832 0 0 Y 2/3 1/3 .25 .198 .005573 .005573 .012221 .002832 0 0 F .3089 .3932 .25 .009136 .009776 .025606 .005299 0 0