Richterite
Yang H, Konzett J, Prewitt C T, Fei Y
American Mineralogist 84 (1999) 681-684
Single-crystal structure refinement of synthetic K-substituted potassic
richterite, K(KCa)Mg5Si8O22(OH)2
_database_code_amcsd 0002223
10.1926 18.1209 5.2736 90 105.514 90 C2/m
atom     x     y     z occ Biso B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3)
Mg1      0 .0889    .5           .0014  .0005  .0052      0  .0001      0
Mg2      0 .1800     0           .0018  .0004  .0070      0  .0008      0
Mg3      0     0     0           .0010  .0004  .0049      0  .0004      0
Ca4      0 .2819    .5  .5       .0027  .0007  .0113      0  .0025      0
K4       0 .2819    .5  .5       .0027  .0007  .0113      0  .0025      0
Si1  .2706 .0847 .3065           .0012  .0004  .0039  .0000  .0001 -.0002
Si2  .2812 .1708 .8131           .0014  .0004  .0040 -.0002 -.0003 -.0001
K     .013    .5  .028           .0004  .0015  .0119      0 -.0006      0
H     .202     0  .747      1.3
O1   .1083 .0869 .2204           .0015  .0004  .0041 -.0001  .0001 -.0001
O2   .1175 .1689 .7298           .0017  .0009  .0072 -.0001  .0002 -.0005
O3   .1038     0 .7188           .0017  .0005  .0073      0  .0007      0
O4   .3589 .2463 .8088           .0043  .0007  .0100 -.0010 -.0011 -.0001
O5   .3399 .1289 .1057           .0017  .0008  .0051  .0001  .0002  .0007
O6   .3339 .1145 .6050           .0023  .0007  .0046 -.0001 -.0008 -.0007
O7   .3271     0 .3047           .0016  .0004  .0117      0  .0005      0