Pyroxene-ideal Thompson R M, Downs R T American Mineralogist 88 (2003) 653-666 Model pyroxenes I: Ideal pyroxene topologies Pyroxene #37a based on stacking sequence ABABACABACBC Note: Atoms Mg, Si, and O are assigned to atomic positions just for convenience. _database_code_amcsd 0003049 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: 17.44801275 RIR: 0.578 RIR based on corundum from Acta Crystallographica A38 (1982) 733-739 2-THETA INTENSITY D-SPACING H K L Multiplicity 20.10 1.25 4.4188 3 1 0 2 27.31 4.21 3.2660 6 0 0 1 29.78 8.94 3.0000 0 2 0 2 29.78 4.21 3.0000 0 1 1 2 30.14 8.57 2.9654 1 1 1 2 31.18 6.51 2.8685 -2 1 1 2 31.18 4.18 2.8685 2 1 1 2 32.85 3.95 2.7262 3 1 1 2 32.85 1.07 2.7262 -3 1 1 2 35.07 1.31 2.5584 -4 1 1 2 40.02 3.52 2.2528 -1 2 1 2 40.84 29.53 2.2094 6 2 0 2 40.84 4.18 2.2094 6 1 1 2 40.84 4.61 2.2094 -6 1 1 2 40.84 7.38 2.2094 -2 2 1 2 40.84 1.49 2.2094 2 2 1 2 42.18 17.23 2.1423 3 2 1 2 42.18 27.48 2.1423 -3 2 1 2 44.00 7.59 2.0580 -4 2 1 2 44.25 97.46 2.0467 9 1 0 2 44.25 2.22 2.0467 -7 1 1 2 46.25 2.65 1.9629 5 2 1 2 46.25 22.62 1.9629 -5 2 1 2 47.95 3.18 1.8974 8 1 1 2 47.95 5.18 1.8974 -8 1 1 2 48.89 6.29 1.8628 6 2 1 2 51.89 1.33 1.7621 -9 1 1 2 51.89 7.67 1.7621 7 2 1 2 51.89 7.45 1.7621 -7 2 1 2 53.08 1.32 1.7253 -1 3 1 2 53.08 3.69 1.7253 1 3 1 2 53.08 1.85 1.7253 -1 0 2 1 53.74 3.76 1.7056 -2 3 1 2 53.74 16.77 1.7056 2 3 1 2 53.74 8.38 1.7056 -2 0 2 1 53.74 1.88 1.7056 2 0 2 1 54.84 3.58 1.6742 3 3 1 2 54.84 14.69 1.6742 -3 3 1 2 54.84 7.35 1.6742 3 0 2 1 54.84 1.79 1.6742 -3 0 2 1 55.20 1.90 1.6641 8 2 1 2 55.41 1.28 1.6581 1 1 2 2 56.06 4.35 1.6406 10 1 1 2 56.06 2.68 1.6406 2 1 2 2 56.34 4.46 1.6330 12 0 0 1 56.34 11.61 1.6330 4 3 1 2 56.34 8.64 1.6330 -4 3 1 2 56.34 4.32 1.6330 4 0 2 1 56.34 5.80 1.6330 -4 0 2 1 57.12 10.48 1.6126 3 1 2 2 57.12 6.61 1.6126 -3 1 2 2 58.24 11.98 1.5842 -5 3 1 2 58.24 5.99 1.5842 5 0 2 1 58.58 3.00 1.5757 4 1 2 2 58.79 1.25 1.5706 -9 2 1 2 58.79 1.19 1.5706 9 2 1 2 60.44 1.09 1.5317 11 1 1 2 60.44 9.37 1.5317 5 1 2 2 60.44 1.10 1.5317 -5 1 2 2 60.50 4.42 1.5302 6 3 1 2 60.50 10.16 1.5302 -6 3 1 2 60.50 5.08 1.5302 6 0 2 1 60.50 2.21 1.5302 -6 0 2 1 62.66 2.78 1.4827 -6 1 2 2 63.12 1.37 1.4729 7 3 1 2 63.12 3.29 1.4729 -7 3 1 2 63.12 1.65 1.4729 7 0 2 1 65.03 2.40 1.4343 12 1 1 2 65.03 1.77 1.4343 -12 1 1 2 65.22 3.52 1.4304 7 1 2 2 65.22 3.50 1.4304 -7 1 2 2 66.07 10.12 1.4142 -8 3 1 2 66.07 2.11 1.4142 8 3 1 2 66.07 5.06 1.4142 8 0 2 1 66.07 1.05 1.4142 -8 0 2 1 66.78 1.49 1.4009 11 2 1 2 68.88 5.38 1.3631 6 4 0 2 68.88 1.34 1.3631 -2 4 1 2 69.33 2.11 1.3555 -9 3 1 2 69.33 1.05 1.3555 9 0 2 1 69.83 5.47 1.3469 -3 4 1 2 69.83 3.49 1.3469 3 4 1 2 71.15 1.57 1.3252 -12 2 1 2 71.15 1.57 1.3252 -4 4 1 2 72.83 4.98 1.2987 -5 4 1 2 72.89 4.85 1.2978 10 3 1 2 72.89 2.43 1.2978 -10 0 2 1 74.12 1.19 1.2792 8 2 2 2 74.30 2.62 1.2765 15 1 0 2 74.86 1.55 1.2684 6 4 1 2 75.77 2.17 1.2554 13 2 1 2 76.75 4.10 1.2418 -11 3 1 2 76.75 2.05 1.2418 11 0 2 1 77.23 1.96 1.2352 7 4 1 2 77.23 2.05 1.2352 -7 4 1 2 80.67 1.30 1.1911 -10 2 2 2 80.91 3.70 1.1882 12 3 1 2 80.91 7.80 1.1882 -12 3 1 2 80.91 1.85 1.1882 -12 0 2 1 80.91 3.90 1.1882 12 0 2 1 85.37 3.21 1.1371 -13 3 1 2 85.37 1.04 1.1371 13 3 1 2 85.37 1.61 1.1371 13 0 2 1 85.85 1.12 1.1320 15 2 1 2 87.27 1.40 1.1172 -13 1 2 2 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.