Akermanite Diffraction data computed using the structure from the paper listed below, along with the cell parameters refined from the powder pattern for R061100 Swainson I P, Dove M T, Schmahl W W, Putnis A Physics and Chemistry of Minerals 19 (1992) 185-195 Neutron powder diffraction study of the akermanite-gehlenite solid solution series Sample: 50% Ak CELL PARAMETERS: 7.768350 7.768350 5.021994 90.00000 90.00000 90.00000 SPACE GROUP: P-42_1m X-RAY WAVELENGTH: 1.541838 2-THETA INTENSITY D-SPACING H K L 16.16 8.31 5.4931 1 1 0 17.68 2.92 5.0220 0 0 1 21.08 4.61 4.2175 1 0 1 22.91 1.95 3.8842 2 0 0 24.02 15.02 3.7065 1 1 1 25.65 3.92 3.4741 2 1 0 29.07 21.44 3.0724 2 0 1 31.32 100.00 2.8571 2 1 1 32.61 4.39 2.7465 2 2 0 35.76 2.47 2.5110 0 0 2 36.58 17.50 2.4566 3 1 0 37.32 6.90 2.4097 2 2 1 37.65 7.29 2.3893 1 0 2 39.14 7.23 2.3015 3 0 1 39.46 3.01 2.2837 1 1 2 40.89 1.28 2.2067 3 1 1 44.52 9.47 2.0351 2 1 2 45.82 2.12 1.9800 3 2 1 46.77 6.37 1.9421 4 0 0 48.30 3.22 1.8841 4 1 0 49.15 2.70 1.8532 2 2 2 49.79 7.72 1.8310 3 3 0 51.82 6.01 1.7640 4 1 1 52.07 17.23 1.7560 3 1 2 52.68 5.32 1.7371 4 2 0 53.24 2.14 1.7202 3 3 1 56.24 1.53 1.6351 3 2 2 57.54 1.64 1.6013 1 1 3 61.47 4.35 1.5081 2 1 3 63.82 1.68 1.4579 5 1 1 65.25 3.53 1.4294 2 2 3 65.29 1.12 1.4285 4 2 2 66.48 1.67 1.4058 3 0 3 67.71 1.21 1.3833 3 1 3 67.53 6.63 1.3865 5 2 1 68.27 2.59 1.3733 4 4 0 71.15 1.06 1.3246 4 4 1 73.05 2.30 1.2947 6 0 0 76.01 2.36 1.2514 4 1 3 81.60 1.14 1.1793 5 4 1 84.07 1.03 1.1508 6 0 2 86.29 1.57 1.1267 5 1 3 87.14 1.09 1.1180 3 1 4 87.14 1.09 1.1180 3 1 4 XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.