Yoshiokaite Steele I M, Pluth J J American Mineralogist 75 (1990) 1186-1191 Crystal structure of synthetic yoshiokaite, a stuffed derivative of the tridymite structure _database_code_amcsd 0001330 9.927 9.927 8.220 90 90 120 P-3 atom x y z occ U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) Si1 .67620 .75715 -.06751 .331 0.0079 0.0087 0.0108 0.0048 0.0002 -.0009 Al1 .67620 .75715 -.06751 .669 0.0079 0.0087 0.0108 0.0048 0.0002 -.0009 Si2 .75703 .67636 .56732 .331 0.0086 0.0079 0.0111 0.0046 0.0010 -.0002 Al2 .75703 .67636 .56732 .669 0.0086 0.0079 0.0111 0.0046 0.0010 -.0002 Si3 1/3 2/3 .9618 .166 0.0072 0.0072 0.027 0.0036 0 0 Al3 1/3 2/3 .9618 .334 0.0072 0.0072 0.027 0.0036 0 0 Si3' 1/3 2/3 .0421 .166 0.0054 0.0054 0.0070 0.0027 0 0 Al3' 1/3 2/3 .0421 .334 0.0054 0.0054 0.0070 0.0027 0 0 Si4 1/3 2/3 .5407 .166 0.0046 0.0046 0.0083 0.0023 0 0 Al4 1/3 2/3 .5407 .334 0.0046 0.0046 0.0083 0.0023 0 0 Si4' 1/3 2/3 .4606 .166 0.0085 0.0085 0.025 .00425 0 0 Al4' 1/3 2/3 .4606 .334 0.0085 0.0085 0.025 .00425 0 0 O1 .2816 .0567 .0762 0.0189 0.0161 0.0147 0.0092 0.0014 -.0002 O2 .0556 .2814 .4241 0.0164 0.0181 0.0150 0.0090 -.0015 -.0019 O3 .5134 .3560 .0028 0.0129 0.0153 0.060 0.0075 0.0088 0.0099 O4 .3556 .5132 .4957 0.0160 0.0129 0.062 0.0074 -.0111 -.0116 O5 .6827 .0004 .2508 0.0193 0.0200 0.0174 0.0104 -.0003 0.0013 O6 1/3 2/3 .2501 .5 0.042 0.042 0.020 0.021 0 0 O6' 2/3 1/3 .2573 .5 0.047 0.047 0.021 0.0235 0 0 Ca .44328 .00004 .25008 .892 0.0192 0.0425 0.0151 0.0214 -.0023 -.0043