Hilgardite
Ghose S, Wan C
American Mineralogist 64 (1979) 187-195
Hilgardite, Ca2[B5O9]Cl*H2O: a piezoelectric zeolite-type pentaborate
Note: polytype Hilgardite-4M
Locality: Choctow Salt Dome, Iberville Parish, Louisiana, USA
_database_code_amcsd 0000696
11.438 11.318 6.318 90 90.06 90 Aa
atom      x      y      z Biso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3)
Ca1       0 .25023      0       .0107  .0116  .0073  .0005  .0002 -.0007
Ca2  .27346 .47081 .84144       .0101  .0092  .0061  .0011  .0002  .0012
Cl   .02385 .49169 .90054       .0122  .0123  .0202  .0000 -.0017 -.0013
B1    .2604  .1951  .6460       .0660  .0059  .0052 -.0001  .0002  .0008
B2    .2710  .0280  .8833       .0091  .0060  .0067 -.0004 -.0003  .0000
B3    .2252  .3065  .3208       .0056  .0056  .0051  .0008 -.0002  .0006
B4    .3361  .2296  .0083       .0061  .0060  .0047 -.0001 -.0001  .0004
B5    .0602  .2573  .5415       .0051  .0084  .0071  .0007 -.0002 -.0005
O1    .2668  .0652  .6779       .0160  .0055  .0061 -.0007 -.0002  .0009
O2    .3458  .2565  .7813       .0069  .0076  .0047 -.0015 -.0012  .0002
O3    .1411  .2367  .6981       .0052  .0139  .0069  .0022 -.0004  .0007
O4    .2894  .2121  .4268       .0086  .0070  .0042  .0024  .0002  .0009
O5    .2953  .1055  .0429       .0167  .0057  .0062 -.0025 -.0007 -.0001
O6    .4494  .2436  .1134       .0048  .0164  .0069 -.0021 -.0003 -.0001
O7    .2528  .3138  .0991       .0089  .0084  .0047  .0028  .0012  .0005
O8    .2479  .4161  .4462       .0168  .0054  .0071 -.0027 -.0003 -.0001
O9    .0949  .2834  .3389       .0058  .0132  .0067 -.0005 -.0004  .0026
OW    .0101  .0492  .9092       .0283  .0132  .0238  .0025  .0044  .0036
H1     .034   .026   .789  4.2
H2     .041   .495   .521 10.3