Merwinite
Moore P B, Araki T
American Mineralogist 57 (1972) 1355-1374
Atomic arrangement of merwinite, Ca3Mg[SiO4]2, an unusual dense-packed
structure of geophysical interest
_database_code_amcsd 0000294
CELL PARAMETERS: 13.2540 5.2930 9.3280 90.000 91.900 90.000
SPACE GROUP: P2_1/a
X-RAY WAVELENGTH: 1.541838
Cell Volume: 654.031
Density (g/cm3): 3.338
MAX. ABS. INTENSITY / VOLUME**2: 13.85389790
RIR: 1.351
RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
2-THETA INTENSITY D-SPACING H K L Multiplicity
9.49 2.83 9.3229 0 0 1 2
13.37 4.18 6.6234 2 0 0 2
19.28 2.85 4.6029 0 1 1 4
20.32 1.41 4.3701 -1 1 1 4
20.53 2.44 4.3260 1 1 1 4
22.96 5.14 3.8729 -2 0 2 2
23.72 2.05 3.7511 2 1 1 4
26.92 9.05 3.3117 4 0 0 2
28.23 6.53 3.1607 3 1 1 4
29.16 1.37 3.0620 2 1 2 4
31.88 2.01 2.8075 4 1 0 4
32.65 29.93 2.7430 -4 0 2 2
33.06 8.76 2.7093 -4 1 1 4
33.44 100.00 2.6799 0 1 3 4
33.60 47.58 2.6676 4 1 1 4
33.87 41.89 2.6465 0 2 0 2
36.53 3.88 2.4599 2 1 3 4
38.81 2.63 2.3206 -3 1 3 4
38.95 8.52 2.3126 -5 1 1 4
39.14 10.36 2.3015 0 2 2 4
39.52 7.46 2.2801 5 1 1 4
39.87 4.21 2.2612 1 2 2 4
40.61 8.84 2.2218 -2 0 4 2
40.87 17.32 2.2078 6 0 0 2
41.32 1.17 2.1851 -2 2 2 4
41.50 9.36 2.1761 2 0 4 2
41.76 9.75 2.1630 2 2 2 4
42.37 1.38 2.1331 0 1 4 4
44.07 10.18 2.0547 -3 2 2 4
44.46 1.07 2.0376 6 1 0 4
44.70 7.78 2.0273 3 2 2 4
44.84 5.71 2.0214 -6 0 2 2
45.88 1.08 1.9781 6 1 1 4
47.75 39.31 1.9046 -4 2 2 4
48.19 1.08 1.8884 -6 1 2 4
48.50 24.09 1.8769 4 0 4 2
50.16 1.59 1.8186 -4 1 4 4
52.22 2.10 1.7517 -5 2 2 4
52.98 1.93 1.7284 -6 1 3 4
53.25 1.11 1.7203 -1 3 1 4
53.34 1.58 1.7175 1 3 1 4
54.10 2.55 1.6953 6 2 0 4
54.61 1.25 1.6806 6 1 3 4
55.50 3.17 1.6558 8 0 0 2
56.95 1.50 1.6171 -3 3 1 4
57.12 1.75 1.6125 3 2 4 4
57.21 2.11 1.6103 3 3 1 4
57.36 4.60 1.6064 -6 2 2 4
58.66 7.96 1.5737 -4 1 5 4
58.97 5.05 1.5663 -8 1 1 4
59.49 6.32 1.5538 0 0 6 2
59.90 4.87 1.5443 8 0 2 2
60.33 8.77 1.5343 0 3 3 4
60.43 9.21 1.5320 4 3 1 4
60.47 11.43 1.5310 4 2 4 4
61.34 1.41 1.5113 -8 1 2 4
61.85 1.21 1.5001 -2 3 3 4
64.23 1.55 1.4501 7 2 2 4
65.40 4.66 1.4270 -8 1 3 4
66.62 1.23 1.4037 8 2 0 4
66.77 1.79 1.4009 -4 3 3 4
66.99 2.33 1.3970 -6 1 5 4
67.32 5.10 1.3910 8 1 3 4
68.40 1.65 1.3715 -8 0 4 2
69.37 1.03 1.3547 -8 2 2 4
70.25 11.36 1.3399 0 2 6 4
70.62 4.94 1.3338 8 2 2 4
70.89 1.04 1.3293 1 2 6 4
70.90 1.19 1.3292 8 0 4 2
71.27 2.80 1.3233 0 4 0 2
71.43 3.62 1.3207 -2 2 6 4
71.68 2.20 1.3167 1 4 0 4
72.90 1.15 1.2976 2 4 0 4
73.70 1.29 1.2855 -10 0 2 2
74.92 1.40 1.2676 3 4 0 4
77.63 1.85 1.2299 4 2 6 4
77.71 2.03 1.2288 4 4 0 4
77.92 1.62 1.2261 -3 4 2 4
78.56 1.57 1.2177 -8 2 4 4
79.59 1.27 1.2044 -4 3 5 4
80.45 1.58 1.1937 8 3 1 4
80.61 2.22 1.1918 -4 4 2 4
80.72 3.68 1.1904 4 1 7 4
80.99 1.84 1.1872 8 1 5 4
83.28 1.11 1.1603 -6 2 6 4
87.89 1.06 1.1109 -4 0 8 2
88.27 1.64 1.1071 -6 4 2 4
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XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.