American Mineralogist Crystal Structure Database

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Alumoakermanite
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Wiedenmann D, Zaitsev A N, Britvin S N, Krivovichev S V, Keller J
 
Mineralogical Magazine 73 (2009) 373-384
Alumoakermanite, (Ca,Na)2(Al,Mg,Fe2+)(Si2O7), a new mineral from the active
carbonatite-nephelinite-phonolite volcano Oldoinyo Lengai, northern Tanzania
Locality: Oldoinyo Lengai, northern Tanzania
_database_code_amcsd 0020206
7.7661 7.7661 5.0297 90. 90. 90. P-42_1m
atom      x      y      z occ   Uiso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3)
Ca1  .66382 .83618 .49132 .76  .0182  .0204  .0204  .0138  .0063 -.0016 -.0016
Na1  .66382 .83618 .49132 .24  .0182  .0204  .0204  .0138  .0063 -.0016 -.0016
Al2       0      0      0 .50  .0125  .0111  .0111  .0154      0      0      0
Fe2       0      0      0 .30  .0125  .0111  .0111  .0154      0      0      0
Mg2       0      0      0 .20  .0125  .0111  .0111  .0154      0      0      0
Si   .85952 .64048 .05699     .01169  .0122  .0122  .0106  .0014  .0002  .0002
O1       .5      0  .8240      .0237  .0293  .0293   .012  -.017      0      0
O2   .85812 .64188  .7411      .0246  .0301  .0301  .0136  .0063  .0025  .0025
O3    .9172 .81825  .2026      .0257  .0372  .0186  .0214 -.0074  .0053 -.0045
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