Esperanzaite
Foord E E, Hughes J M, Cureton F E, Maxwell C H, Falster A U, Sommer A J, Hlava P F
The Canadian Mineralogist 37 (1999) 67-72
Esperanzaite, NaCa2Al2(AsO4)2F4(OH).2H2O, a new mineral species from
the La Esperanza mine, Mexico: Descriptive mineralogy and atomic arrangement
Locality: La Esperanza mine, Mexico
_database_code_amcsd 0005592
9.687 10.7379 5.5523 90 105.32 90 P2_1/m
atom      x       y      z occ Biso
As1   .0074     .25  .1397      .67
As2  .54657     .25  .8681      .65
Ca    .3555   .4175  .2602      .87
Al   -.2436   .4108  .2750      .71
Na    .1883     .25 -.2949 .68 1.71
F1    .2191   .4361 -.1665     1.34
F2    .4038   .5319  .6411     1.10
OH    .7260     .25   .382       .8
Wat   .1511   .5406  .3739     1.13
O1    .1848     .25   .267      1.2
O2   -.0601   .3748  .2470     1.15
O3    .4242     .25  1.030       .8
O4    .4710     .25   .564      1.2
O5    .3476   .6224  .0582      .92
O6   -.0320     .25  -.172      1.4