Pyroxene-ideal Thompson R M, Downs R T American Mineralogist 88 (2003) 653-666 Model pyroxenes I: Ideal pyroxene topologies Pyroxene #49a based on stacking sequence ABABCABCACBC Note: Atoms Mg, Si, and O are assigned to atomic positions just for convenience. _database_code_amcsd 0003069 CELL PARAMETERS: 19.5959 6.0000 3.4641 90.000 90.000 90.000 SPACE GROUP: Pc X-RAY WAVELENGTH: 1.541838 Cell Volume: 407.293 Density (g/cm3): 9.821 MAX. ABS. INTENSITY / VOLUME**2: 18.47639435 RIR: 0.613 RIR based on corundum from Acta Crystallographica A38 (1982) 733-739 2-THETA INTENSITY D-SPACING H K L Multiplicity 20.10 1.18 4.4188 3 1 0 2 27.31 3.98 3.2660 6 0 0 1 29.78 8.44 3.0000 0 2 0 2 30.14 3.45 2.9654 -1 1 1 2 30.14 6.86 2.9654 1 1 1 2 31.18 1.01 2.8685 -2 1 1 2 31.18 2.75 2.8685 2 1 1 2 32.85 1.01 2.7262 3 1 1 2 32.85 6.45 2.7262 -3 1 1 2 35.07 1.27 2.5584 -4 1 1 2 40.02 3.05 2.2528 -1 2 1 2 40.84 27.89 2.2094 6 2 0 2 40.84 20.91 2.2094 -2 2 1 2 40.84 1.75 2.2094 2 2 1 2 42.18 4.04 2.1423 3 2 1 2 42.18 4.04 2.1423 -3 2 1 2 44.00 11.31 2.0580 4 2 1 2 44.00 3.48 2.0580 -4 2 1 2 44.25 92.03 2.0467 9 1 0 2 44.25 7.43 2.0467 7 1 1 2 46.25 8.06 1.9629 5 2 1 2 46.25 8.73 1.9629 -5 2 1 2 47.95 5.13 1.8974 8 1 1 2 47.95 2.84 1.8974 -8 1 1 2 48.89 3.28 1.8628 6 2 1 2 48.89 14.95 1.8628 -6 2 1 2 51.89 1.83 1.7621 -9 1 1 2 51.89 3.81 1.7621 9 1 1 2 51.89 4.68 1.7621 7 2 1 2 51.89 10.48 1.7621 -7 2 1 2 53.08 13.14 1.7253 1 3 1 2 53.08 6.57 1.7253 -1 0 2 1 53.74 3.35 1.7056 -2 3 1 2 53.74 17.04 1.7056 2 3 1 2 53.74 8.52 1.7056 -2 0 2 1 53.74 1.68 1.7056 2 0 2 1 54.84 24.38 1.6742 3 3 1 2 54.84 3.38 1.6742 -3 3 1 2 54.84 1.69 1.6742 3 0 2 1 54.84 12.19 1.6742 -3 0 2 1 55.20 7.86 1.6641 -8 2 1 2 55.41 1.12 1.6581 1 1 2 2 56.06 1.92 1.6406 10 1 1 2 56.06 2.25 1.6406 -10 1 1 2 56.06 7.72 1.6406 2 1 2 2 56.34 4.21 1.6330 12 0 0 1 56.34 1.64 1.6330 4 3 1 2 56.34 5.60 1.6330 -4 3 1 2 56.34 2.80 1.6330 4 0 2 1 57.12 1.55 1.6126 3 1 2 2 57.12 1.55 1.6126 -3 1 2 2 58.24 4.05 1.5842 5 3 1 2 58.24 13.15 1.5842 -5 3 1 2 58.24 2.02 1.5842 -5 0 2 1 58.24 6.57 1.5842 5 0 2 1 58.58 1.37 1.5757 4 1 2 2 58.58 4.51 1.5757 -4 1 2 2 60.44 2.29 1.5317 -11 1 1 2 60.44 3.61 1.5317 5 1 2 2 60.44 3.33 1.5317 -5 1 2 2 62.66 6.58 1.4827 6 1 2 2 62.66 1.40 1.4827 -6 1 2 2 63.12 3.63 1.4729 7 3 1 2 63.12 2.14 1.4729 -7 3 1 2 63.12 1.07 1.4729 7 0 2 1 63.12 1.81 1.4729 -7 0 2 1 65.22 4.90 1.4304 7 1 2 2 65.22 2.15 1.4304 -7 1 2 2 66.07 4.43 1.4142 -8 3 1 2 66.07 5.12 1.4142 8 3 1 2 66.07 2.21 1.4142 8 0 2 1 66.07 2.56 1.4142 -8 0 2 1 66.78 1.62 1.4009 11 2 1 2 68.12 3.97 1.3765 8 1 2 2 68.88 5.08 1.3631 6 4 0 2 68.88 4.01 1.3631 -2 4 1 2 69.33 1.97 1.3555 -9 3 1 2 69.33 5.55 1.3555 9 3 1 2 69.33 2.78 1.3555 -9 0 2 1 71.15 2.83 1.3252 12 2 1 2 71.15 2.39 1.3252 4 4 1 2 71.33 1.61 1.3222 -7 2 2 2 72.83 1.77 1.2987 5 4 1 2 72.83 1.92 1.2987 -5 4 1 2 72.89 1.27 1.2978 10 3 1 2 72.89 1.07 1.2978 -10 3 1 2 74.12 1.22 1.2792 -8 2 2 2 74.30 2.47 1.2765 15 1 0 2 74.86 3.64 1.2684 -6 4 1 2 76.75 4.56 1.2418 -11 3 1 2 76.75 1.38 1.2418 11 3 1 2 76.75 2.28 1.2418 11 0 2 1 77.23 1.22 1.2352 7 4 1 2 77.23 2.83 1.2352 -7 4 1 2 77.23 1.01 1.2352 -9 2 2 2 79.95 2.43 1.2000 -8 4 1 2 82.82 1.75 1.1655 -12 1 2 2 85.37 1.91 1.1371 -13 3 1 2 85.37 3.79 1.1371 13 3 1 2 85.37 1.90 1.1371 -13 0 2 1 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.