Friedrichbeckeite
Lengauer C L, Hrauda N, Kolitsch U, Krickl R, Tillmanns E
Mineralogy and Petrology 96 (2009) 221-232
Friedrichbeckeite, K(_0.5Na0.5)2(Mg0.8Mn0.1Fe0.1)2(Be0.6Mg0.4)3[Si12O30],
a new milarite-type mineral from the Bellerberg volcano, Eifel area, Germany
Locality: Bellerberg volcano, Eifel area, Germany
_database_code_amcsd 0014649
9.970 9.970 14.130 90 90 120 P6/mcc
atom      x      y      z  occ  Uiso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3)
KC        0      0    .25 .926 .0265  .0242  .0242  .0309  .0121      0      0
NaB     1/3    2/3  .0204 .193  .030   .020   .020    .05   .010      0      0
MgA     1/3    2/3    .25 .807 .0160  .0157  .0157  .0165 .00785      0      0
MnA     1/3    2/3    .25 .193 .0160  .0157  .0157  .0165 .00785      0      0
BeT2     .5      0    .25 .607 .0114  .0140  .0059  .0117 .00295      0      0
MgT2     .5      0    .25 .393 .0114  .0140  .0059  .0117 .00295      0      0
SiT1 .10056 .35367 .10910      .0123  .0115  .0119  .0132  .0057 -.0002 -.0021
O1    .1190  .4085      0      .0294   .047   .024  .0124   .014      0      0
O2    .2107  .2814  .1284      .0299  .0290  .0393  .0358  .0277 -.0006 -.0040
O3    .1353  .4918  .1790      .0222  .0304  .0193  .0222  .0164 -.0106 -.0094