Langbeinite Diffraction data computed using the structure from the paper listed below, along with the cell parameters refined from the powder pattern Speer D, Salje E Physics and Chemistry of Minerals 13 (1986) 17-24 Phase transitions in langbeinites I: Crystal chemistry and structures of K-double sulfates of the langbeinite type M2++K2(SO4)3, M++=Mg,Ni,Co,Zn,Ca Sample: K2Ca2(SO4)3, T = 260 C CELL PARAMETERS: 9.920862 9.920862 9.920862 90.00000 90.00000 90.00000 SPACE GROUP: P2_13 X-RAY WAVELENGTH: 1.541838 2-THETA INTENSITY D-SPACING H K L 15.47 3.12 5.7278 1 1 1 20.01 2.01 4.4367 2 1 0 21.94 17.02 4.0502 2 1 1 26.95 1.90 3.3070 2 2 1 28.44 50.08 3.1373 3 0 1 28.44 49.92 3.1373 3 1 0 29.86 6.58 2.9913 3 1 1 32.53 4.10 2.7516 3 2 0 33.79 16.37 2.6515 3 2 1 33.79 23.59 2.6515 3 1 2 37.36 1.40 2.4062 4 0 1 37.36 1.78 2.4062 3 2 2 39.58 1.87 2.2760 3 3 1 41.70 1.00 2.1649 4 1 2 42.73 4.94 2.1151 3 3 2 44.73 10.58 2.0251 4 2 2 46.66 6.38 1.9456 4 3 1 46.66 6.66 1.9456 4 1 3 49.45 2.74 1.8423 5 2 0 49.45 2.38 1.8423 4 2 3 52.99 4.04 1.7270 4 4 1 53.85 1.94 1.7014 5 3 0 57.21 4.97 1.6094 5 3 2 57.21 3.94 1.6094 5 2 3 57.21 4.76 1.6094 6 1 1 58.83 2.67 1.5686 6 0 2 58.83 1.88 1.5686 6 2 0 60.44 1.55 1.5308 5 4 1 62.79 1.07 1.4789 5 4 2 62.79 1.39 1.4789 6 3 0 63.57 1.58 1.4628 6 3 1 63.57 2.68 1.4628 6 1 3 65.10 1.55 1.4320 4 4 4 65.86 1.06 1.4173 6 2 3 69.59 1.05 1.3501 5 5 2 69.59 1.90 1.3501 7 1 2 71.06 1.42 1.3257 6 2 4 73.24 1.17 1.2916 7 1 3 82.43 1.27 1.1692 8 2 2 83.83 1.31 1.1533 7 4 3 83.83 1.31 1.1533 7 4 3 XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.