Phenakite Diffraction data computed using the structure from the paper listed below, along with the cell parameters refined from the powder pattern of R040046 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 = 1 bar CELL PARAMETERS: 12.4710 12.4710 8.2510 90.000 90.000 120.000 SPACE GROUP: R-3 ATOM X Y Z OCCUPANCY ISO(B) Be 0.19410 0.21040 0.41550 1.000 0.360 Be 0.19410 0.21180 0.08410 1.000 0.400 Si 0.19550 0.21155 0.74996 1.000 0.140 O 0.20950 0.08840 0.75030 1.000 0.290 O 0.33360 0.33320 0.75010 1.000 0.260 O 0.12250 0.21000 0.91460 1.000 0.260 O 0.12250 0.20900 0.58500 1.000 0.280 X-RAY WAVELENGTH: 1.541838 BOUNDS ON TWO THETA: 5.0 90.0 LIMITS IMPOSED ON THE INDICES ARE: +/- 9 +/- 9 +/- 7 MAX. ABS. INTENSITY / VOLUME**2: 6.734221936 The INTENSITY cut off value is 1.00 2-THETA INTENSITY D-SPACING H K L 14.20 46.66 6.2355 1 1 0 19.65 2.02 4.5184 0 2 1 23.08 24.23 3.8539 0 1 2 24.33 46.53 3.6588 3 -1 1 24.33 27.33 3.6588 2 1 1 24.73 33.85 3.6001 3 0 0 27.20 2.88 3.2783 2 0 2 28.63 100.00 3.1177 2 2 0 30.81 6.58 2.9017 -1 3 2 30.81 8.73 2.9017 1 2 2 31.78 8.47 2.8156 1 3 1 31.78 3.66 2.8156 -1 4 1 35.68 37.37 2.5164 2 -1 3 35.68 37.37 2.5164 1 1 3 38.19 3.10 2.3568 1 4 0 38.19 49.04 2.3568 4 1 0 39.90 5.44 2.2592 0 4 2 41.31 32.43 2.1855 0 3 3 41.31 32.67 2.1855 3 0 3 42.56 1.36 2.1241 2 3 2 43.54 43.03 2.0785 3 3 0 44.73 3.04 2.0261 1 0 4 45.80 5.14 1.9813 2 4 1 47.51 9.49 1.9136 5 0 2 49.51 1.84 1.8410 3 -1 4 49.51 1.39 1.8410 2 1 4 50.72 3.20 1.8000 6 0 0 51.03 6.75 1.7896 -1 5 3 51.03 6.78 1.7896 4 1 3 52.10 3.42 1.7554 -1 6 2 52.74 1.31 1.7358 4 3 1 52.74 4.91 1.7358 7 -3 1 52.95 12.26 1.7294 2 5 0 52.95 1.54 1.7294 5 2 0 55.41 10.36 1.6582 6 -3 3 55.41 10.68 1.6582 3 3 3 56.11 2.11 1.6391 4 0 4 56.42 1.09 1.6309 3 4 2 57.02 1.62 1.6152 1 6 1 60.52 3.11 1.5299 1 2 5 60.52 2.12 1.5299 -1 3 5 61.57 11.22 1.5061 0 6 3 61.57 11.12 1.5061 6 0 3 62.23 4.17 1.4918 0 5 4 63.09 3.08 1.4736 6 2 1 63.09 1.11 1.4736 8 -2 1 65.22 7.25 1.4305 1 7 0 65.22 8.54 1.4305 7 1 0 66.12 1.52 1.4131 5 1 4 68.19 18.53 1.3752 0 0 6 69.02 1.58 1.3607 6 3 0 69.02 1.45 1.3607 3 6 0 72.03 1.84 1.3111 4 5 2 72.55 1.09 1.3029 -2 9 1 73.85 1.18 1.2832 6 -2 5 74.81 5.56 1.2691 -1 8 3 74.81 19.60 1.2691 1 7 3 74.81 19.62 1.2691 8 -1 3 74.81 5.59 1.2691 7 1 3 75.57 3.72 1.2582 4 -2 6 75.57 3.83 1.2582 2 2 6 78.41 9.68 1.2196 -3 9 3 78.41 9.70 1.2196 6 3 3 79.25 1.48 1.2088 3 4 5 79.95 11.64 1.2000 9 0 0 80.94 4.78 1.1878 -1 5 6 80.94 4.83 1.1878 4 1 6 84.32 1.25 1.1486 9 -4 4 84.47 2.14 1.1469 3 3 6 84.47 2.11 1.1469 6 -3 6 85.49 1.14 1.1358 5 5 3 85.49 1.15 1.1358 -5 -5 3 85.81 1.30 1.1324 3 -1 7 88.07 1.35 1.1090 -2 8 5 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.