Phase-A
      Horiuchi H, Morimoto N, Yamamoto K, Akimoto S I
      American Mineralogist 64 (1979) 593-598
      Crystal structure of 2Mg2SiO4.3Mg(OH)2, a new high-pressure structure type
      _database_code_amcsd 0000737

      CELL PARAMETERS:    7.8603   7.8603   9.5730   90.000   90.000  120.000
      SPACE GROUP: P6_3      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    512.220
      Density (g/cm3):      2.919
      MAX. ABS. INTENSITY / VOLUME**2:      10.08659780    
      RIR:      1.125
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                13.01          5.51        6.8072    1   0   0         6
                15.98          3.47        5.5476    1   0   1         6
                18.54          2.63        4.7865    0   0   2         1
                22.62         29.27        3.9302    1   1   0         6
                22.71          9.95        3.9154    1   0   2         6
                24.48         40.15        3.6357    1   1   1         6
                27.82          7.86        3.2069    2   0   1         6
                29.41          4.04        3.0374    1   1   2         6
                30.95         16.19        2.8893    1   0   3         6
                32.27         65.21        2.7738    2   0   2         6
                34.87          1.40        2.5729    2   1   0         6
                36.15          5.94        2.4847    2   1   1         6
                36.26         18.67        2.4773    1   1   3         6
                37.58          7.22        2.3932    0   0   4         1
                39.72          7.20        2.2691    3   0   0         6
                39.78         65.31        2.2662    1   2   2         6
                39.78         34.69        2.2662    2   1   2         6
                39.93          1.03        2.2578    1   0   4         6
                44.17          2.25        2.0504    3   0   2         6
                44.31          2.40        2.0441    1   1   4         6
                45.27         38.08        2.0029    1   2   3         6
                45.27          4.56        2.0029    2   1   3         6
                46.38          2.10        1.9577    2   0   4         6
                47.22          2.52        1.9249    2   2   1         6
                49.19          1.33        1.8523    1   3   1         6
                49.19          1.69        1.8523    3   1   1         6
                49.28          2.48        1.8492    3   0   3         6
                52.07          6.02        1.7563    1   3   2         6
                52.20         14.51        1.7524    1   2   4         6
                52.20          1.43        1.7524    2   1   4         6
                53.22          1.23        1.7212    1   1   5         6
                53.87          1.70        1.7018    4   0   0         6
                54.79          1.53        1.6755    4   0   1         6
                54.87          1.33        1.6732    2   2   3         6
                55.03          2.25        1.6687    2   0   5         6
                55.83          6.50        1.6466    3   0   4         6
                56.65          4.18        1.6249    3   1   3         6
                57.47          2.05        1.6035    4   0   2         6
                57.79          1.06        1.5955    0   0   6         1
                59.16          1.13        1.5617    3   2   0         6
                59.51          1.94        1.5534    1   0   6         6
                60.02          3.01        1.5413    2   3   1         6
                60.02          1.57        1.5413    3   2   1         6
                60.25         37.20        1.5360    1   2   5         6
                61.78          4.41        1.5016    4   0   3         6
                62.53          3.22        1.4855    1   4   0         6
                62.53         44.20        1.4855    4   1   0         6
                62.56         11.46        1.4847    2   3   2         6
                64.50          3.01        1.4447    2   0   6         6
                65.83          1.14        1.4187    1   4   2         6
                69.30          8.15        1.3559    1   2   6         6
                69.30          3.98        1.3559    2   1   6         6
                69.84          1.32        1.3467    1   4   3         6
                70.20          3.02        1.3408    1   0   7         6
                72.88          2.03        1.2980    3   3   1         6
                73.29          2.41        1.2916    1   1   7         6
                75.30          3.27        1.2621    4   1   4         6
                75.30          1.40        1.2621    1   4   4         6
                76.00          1.59        1.2522    5   0   3         6
                76.71          3.45        1.2424    2   4   2         6
                76.71          1.25        1.2424    4   2   2         6
                78.49          1.07        1.2186    3   1   6         6
                79.01          1.53        1.2119    3   3   3         6
                80.22          2.89        1.1966    0   0   8         1
                80.50          2.53        1.1931    2   4   3         6
                81.20          2.36        1.1846    1   5   2         6
                81.20          1.49        1.1846    5   1   2         6
                82.96          2.25        1.1640    4   0   6         6
                85.74          1.64        1.1331    2   4   4         6
                87.38          3.37        1.1160    2   3   6         6
                88.22          1.86        1.1075    3   1   7         6
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.