Richterite
Della Ventura G, Robert J-L, Beny J-M, Raudsepp M, Hawthorne F C
American Mineralogist 78 (1993) 980-987
The OH-F substitution in Ti-rich potassium richterite: Rietveld structure
refinement and FTIR and micro-Raman spectroscopic studies of synthetic
amphiboles in the system K2O-Na2O-CaO-MgO-SiO2-TiO2-H2O-HF
Sample Rich58
Atomic parameters from ICSD
_database_code_amcsd 0001609
10.0746 18.0337 5.2979 90 104.906 90 C2/m
atom     x     y     z occ Biso
O1   .1113 .0878 .2141       .8
O2   .1163 .1713 .7245       .8
O3   .1063     0 .7174       .8
O4   .3548 .2474 .7939       .8
O5   .3398 .1293  .098      1.1
O6   .3363 .1162 .5859      1.1
OH   .3304     0 .3071      1.2
Si1   .283  .085 .3023       .4
Si2   .283 .1708 .8091 .85   .4
Ti    .283 .1708 .8091 .15   .4
Mg1      0 .0897    .5       .6
Mg2      0 .1797     0       .6
Mg3      0     0     0       .6
Na       0  .277    .5  .5   .9
Ca       0  .277    .5  .5   .9
K    .0179    .5 .0427  .5  2.3