Bertrandite
Hazen R M, Au A Y
Physics and Chemistry of Minerals 13 (1986) 69-78
High-pressure crystal chemistry of phenakite (Be2SiO4)
and bertrandite (Be4Si2O7(OH)2)
Sample: P = 23 kbar
Note: x-coordinate of O2 altered
_database_code_amcsd 0007376
CELL PARAMETERS: 8.6410 15.0510 4.5338 90.000 90.000 90.000
SPACE GROUP: Cmc2_1
X-RAY WAVELENGTH: 1.541838
Cell Volume: 589.646
Density (g/cm3): 2.660
MAX. ABS. INTENSITY / VOLUME**2: 6.520357882
RIR: 0.798
RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
2-THETA INTENSITY D-SPACING H K L Multiplicity
11.76 1.06 7.5255 0 2 0 2
11.81 20.33 7.4938 1 1 0 4
20.47 33.22 4.3387 1 3 0 4
20.56 99.17 4.3205 2 0 0 2
22.90 43.64 3.8835 0 2 1 2
22.93 8.61 3.8791 1 1 1 4
23.65 20.57 3.7627 0 4 0 2
28.47 100.00 3.1346 1 3 1 4
30.88 1.29 2.8955 0 4 1 2
30.96 10.99 2.8882 2 2 1 4
31.47 3.75 2.8427 1 5 0 4
31.53 4.51 2.8375 2 4 0 4
31.63 9.95 2.8290 3 1 0 4
35.80 20.91 2.5085 0 6 0 2
35.95 56.28 2.4979 3 3 0 4
37.34 1.14 2.4084 1 5 1 4
37.39 1.16 2.4053 2 4 1 4
37.47 8.75 2.4001 3 1 1 4
39.76 51.41 2.2669 0 0 2 1
41.12 21.02 2.1949 0 6 1 2
41.26 21.18 2.1878 3 3 1 4
41.62 2.15 2.1698 1 1 2 4
41.63 1.94 2.1694 2 6 0 4
41.82 6.60 2.1602 4 0 0 2
43.49 4.23 2.0811 3 5 0 4
45.13 1.73 2.0092 1 3 2 4
45.17 6.65 2.0074 2 0 2 2
46.40 15.17 1.9569 2 6 1 4
46.78 6.77 1.9417 0 4 2 2
48.00 2.69 1.8954 1 7 1 4
48.11 1.31 1.8914 3 5 1 4
48.38 1.76 1.8814 0 8 0 2
51.57 2.44 1.7723 1 5 2 4
51.61 3.10 1.7711 2 4 2 4
51.67 4.43 1.7690 3 1 2 4
52.67 1.51 1.7377 0 8 1 2
53.36 1.05 1.7169 5 1 0 4
54.56 7.21 1.6819 0 6 2 2
54.68 10.20 1.6787 3 3 2 4
56.01 2.17 1.6419 1 9 0 4
56.19 1.13 1.6369 4 6 0 4
56.30 8.79 1.6340 5 3 0 4
57.19 4.22 1.6106 3 7 1 4
57.39 1.00 1.6056 5 1 1 4
58.93 1.48 1.5673 2 6 2 4
59.07 4.14 1.5639 4 0 2 2
59.92 4.69 1.5438 1 9 1 4
60.09 9.33 1.5396 4 6 1 4
60.20 6.54 1.5372 5 3 1 4
60.38 5.20 1.5330 3 5 2 4
62.70 3.23 1.4817 0 2 3 2
64.35 1.84 1.4477 0 8 2 2
64.42 16.24 1.4462 3 9 0 4
64.73 6.73 1.4402 6 0 0 2
65.33 1.07 1.4284 0 10 1 2
65.39 6.62 1.4272 1 3 3 4
66.74 1.49 1.4016 2 2 3 4
69.63 2.86 1.3503 6 2 1 4
69.94 1.31 1.3450 6 4 0 4
70.67 2.48 1.3330 3 1 3 4
71.13 2.93 1.3255 5 3 2 4
73.10 8.83 1.2945 0 6 3 2
73.20 8.11 1.2930 3 3 3 4
73.32 1.37 1.2912 5 7 1 4
75.85 2.19 1.2542 0 12 0 2
76.14 1.51 1.2502 5 5 2 4
76.23 2.41 1.2490 6 6 0 4
76.88 8.24 1.2400 2 6 3 4
78.44 7.65 1.2192 3 9 2 4
78.72 4.93 1.2156 6 0 2 2
79.59 6.05 1.2045 2 12 0 4
79.62 3.26 1.2041 6 6 1 4
79.80 3.78 1.2018 5 9 0 4
80.56 1.82 1.1924 3 11 1 4
82.94 1.91 1.1641 2 12 1 4
83.16 3.54 1.1617 5 9 1 4
83.40 6.12 1.1589 7 3 1 4
83.59 1.98 1.1567 6 4 2 4
85.46 2.40 1.1362 3 7 3 4
88.03 5.90 1.1095 5 3 3 4
89.36 1.14 1.0964 2 0 4 2
89.62 2.35 1.0939 6 6 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.