Miguelromeroite
Kampf A R, Ross C R
American Mineralogist 73 (1988) 1172-1178
End-member villyaellenite from Mapimi, Durango, Mexico: Descriptive mineralogy,
crystal structure, and implications for the ordering of Mn and Ca in type
villyaellenite
Note: refinition of villyaellenite and introduction of miguelromeroite
results in a name change for this structure refinement
Locality: Mapimi, Durango, Mexico
_database_code_amcsd 0001199
18.015 9.261 9.770 90 96.238 90 C2/c
atom     x     y     z occ U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3)
Mn1     .5 .3943   .75 .97  .0210  .0240  .0062      0  .0011      0
Mn2  .3150 .0874 .1878 .84  .0220  .0220  .0170  .0014  .0005  .0009
Zn2  .3150 .0874 .1878 .16  .0220  .0220  .0170  .0014  .0005  .0009
Mn3  .3257 .4713 .1375 .96  .0218  .0238  .0175 -.0006  .0015 -.0021
Ca3  .3257 .4713 .1375 .04  .0218  .0238  .0175 -.0006  .0015 -.0021
As1  .4168 .3157 .4109      .0218  .0236  .0146  .0007  .0005  .0000
As2  .6611 .2363 .6239      .0198  .0226  .0149 -.0001  .0001  .0004
O1   .4237 .4360 .2892      .0224  .0270  .0198  .0038  .0001  .0029
O2   .3389 .2240 .3631      .0297  .0354  .0156  .0003  .0003 -.0022
O3   .4150 .3915 .5657      .0187  .0418  .0263  .0006 -.0085  .0049
O4   .6648 .2574 .4528      .0244  .0275  .0073 -.0031  .0028 -.0002
O5   .7069 .0874 .6788      .0272  .0239  .0193 -.0041 -.0026  .0104
O6   .7040 .3774 .7046      .0207  .0317  .0266  .0053  .0002 -.0134
O7   .5707 .2276 .6557      .0097  .0396  .0298  .0026 -.0003 -.0085
OH   .4897 .1981 .4226      .0257  .0400  .0294  .0087 -.0043 -.0069
Wat1 .2416 .4219 .4702      .0245  .0320  .0236  .0005 -.0039  .0032
Wat2 .5835 .0053 .8397      .0393  .0343  .0296  .0011  .0054  .0055