Pyroxene-ideal Thompson R M, Downs R T American Mineralogist 88 (2003) 653-666 Model pyroxenes I: Ideal pyroxene topologies Pyroxene #15b based on stacking sequence ABABABCBABAC Note: Atoms Mg, Si, and O are assigned to atomic positions just for convenience. _database_code_amcsd 0003017 CELL PARAMETERS: 19.5959 6.0000 3.4641 90.000 90.000 90.000 SPACE GROUP: P2/c X-RAY WAVELENGTH: 1.541838 Cell Volume: 407.293 Density (g/cm3): 9.821 MAX. ABS. INTENSITY / VOLUME**2: 17.58805590 RIR: 0.583 RIR based on corundum from Acta Crystallographica A38 (1982) 733-739 2-THETA INTENSITY D-SPACING H K L Multiplicity 20.10 1.24 4.4188 3 1 0 4 27.31 4.18 3.2660 6 0 0 2 29.78 8.87 3.0000 0 2 0 2 29.78 12.54 3.0000 0 1 1 4 30.14 6.00 2.9654 -1 1 1 4 30.14 1.69 2.9654 1 1 1 4 31.18 3.85 2.8685 -2 1 1 4 31.18 8.96 2.8685 2 1 1 4 32.85 2.86 2.7262 -3 1 1 4 40.02 2.17 2.2528 1 2 1 4 40.84 29.30 2.2094 6 2 0 4 40.84 6.82 2.2094 6 1 1 4 40.84 4.71 2.2094 -6 1 1 4 40.84 5.12 2.2094 -2 2 1 4 42.18 58.03 2.1423 3 2 1 4 42.18 7.18 2.1423 -3 2 1 4 44.00 1.09 2.0580 4 2 1 4 44.00 13.75 2.0580 -4 2 1 4 44.25 96.68 2.0467 9 1 0 4 44.25 1.40 2.0467 7 1 1 4 44.25 1.92 2.0467 -7 1 1 4 46.25 10.76 1.9629 5 2 1 4 48.89 3.33 1.8628 6 2 1 4 48.89 9.46 1.8628 -6 2 1 4 51.89 1.64 1.7621 -9 1 1 4 51.89 2.68 1.7621 9 1 1 4 51.89 2.55 1.7621 7 2 1 4 52.86 1.15 1.7321 0 3 1 4 53.08 3.12 1.7253 1 3 1 4 53.08 1.56 1.7253 -1 0 2 2 53.74 8.81 1.7056 -2 3 1 4 53.74 1.19 1.7056 2 3 1 4 53.74 4.40 1.7056 2 0 2 2 54.84 11.03 1.6742 3 3 1 4 54.84 5.51 1.6742 -3 0 2 2 55.20 1.59 1.6641 -8 2 1 4 55.20 1.24 1.6641 8 2 1 4 56.06 1.46 1.6406 -10 1 1 4 56.06 1.89 1.6406 2 1 2 4 56.34 4.43 1.6330 12 0 0 2 56.34 7.83 1.6330 4 3 1 4 56.34 16.89 1.6330 -4 3 1 4 56.34 8.45 1.6330 4 0 2 2 56.34 3.92 1.6330 -4 0 2 2 57.12 2.83 1.6126 3 1 2 4 57.12 22.03 1.6126 -3 1 2 4 58.24 5.12 1.5842 5 3 1 4 58.24 3.44 1.5842 -5 3 1 4 58.24 2.56 1.5842 -5 0 2 2 58.24 1.72 1.5842 5 0 2 2 58.58 5.42 1.5757 4 1 2 4 58.79 1.45 1.5706 -9 2 1 4 58.79 1.74 1.5706 9 2 1 4 60.44 1.49 1.5317 11 1 1 4 60.44 4.46 1.5317 -5 1 2 4 60.50 29.07 1.5302 6 3 1 4 60.50 14.53 1.5302 -6 0 2 2 61.85 1.28 1.5000 0 2 2 4 62.66 4.15 1.4827 6 1 2 4 62.66 1.43 1.4827 -6 1 2 4 63.12 7.62 1.4729 -7 3 1 4 63.12 3.81 1.4729 7 0 2 2 65.03 1.30 1.4343 12 1 1 4 65.03 4.40 1.4343 -12 1 1 4 65.22 1.22 1.4304 -7 1 2 4 66.07 3.47 1.4142 8 3 1 4 66.07 1.73 1.4142 -8 0 2 2 68.88 5.33 1.3631 6 4 0 4 68.88 1.24 1.3631 -6 2 2 4 69.33 1.86 1.3555 -9 3 1 4 69.33 3.74 1.3555 9 3 1 4 69.33 1.87 1.3555 -9 0 2 2 69.83 1.57 1.3469 -3 4 1 4 69.83 11.38 1.3469 3 4 1 4 71.15 1.42 1.3252 12 2 1 4 71.15 2.81 1.3252 -4 4 1 4 71.33 1.00 1.3222 -9 1 2 4 72.83 2.38 1.2987 5 4 1 4 72.89 4.32 1.2978 -10 3 1 4 72.89 2.16 1.2978 10 0 2 2 74.30 2.60 1.2765 15 1 0 4 74.86 2.29 1.2684 -6 4 1 4 75.77 2.09 1.2554 -13 2 1 4 76.75 1.20 1.2418 -11 3 1 4 76.75 1.71 1.2418 11 3 1 4 80.67 1.29 1.1911 14 2 1 4 80.91 20.39 1.1882 12 3 1 4 80.91 10.19 1.1882 -12 0 2 2 85.37 7.01 1.1371 -13 3 1 4 85.37 3.50 1.1371 13 0 2 2 85.85 3.31 1.1320 -15 2 1 4 87.27 1.37 1.1172 13 1 2 4 88.51 1.74 1.1047 12 2 2 4 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.