Pyroxene-ideal Thompson R M, Downs R T American Mineralogist 88 (2003) 653-666 Model pyroxenes I: Ideal pyroxene topologies Pyroxene #16 based on stacking sequence ABABACABABAC Note: Atoms Mg, Si, and O are assigned to atomic positions just for convenience. _database_code_amcsd 0003018 CELL PARAMETERS: 19.8997 6.0000 3.4641 90.000 100.025 90.000 SPACE GROUP: Cc X-RAY WAVELENGTH: 1.541838 Cell Volume: 407.293 Density (g/cm3): 9.821 MAX. ABS. INTENSITY / VOLUME**2: 17.00443801 RIR: 0.564 RIR based on corundum from Acta Crystallographica A38 (1982) 733-739 2-THETA INTENSITY D-SPACING H K L Multiplicity 20.10 1.28 4.4188 3 1 0 2 27.31 4.32 3.2660 6 0 0 1 29.78 9.18 3.0000 0 2 0 2 29.78 17.30 3.0000 -1 1 1 2 31.18 9.57 2.8685 -3 1 1 2 31.18 9.57 2.8685 1 1 1 2 40.02 2.30 2.2528 -2 2 1 2 40.02 2.30 2.2528 0 2 1 2 40.84 30.30 2.2094 6 2 0 2 40.84 7.57 2.2094 -7 1 1 2 40.84 5.82 2.2094 5 1 1 2 42.18 60.15 2.1423 -4 2 1 2 42.18 18.08 2.1423 2 2 1 2 44.25 100.00 2.0467 9 1 0 2 46.25 13.79 1.9629 -6 2 1 2 46.25 13.79 1.9629 4 2 1 2 47.95 3.09 1.8974 -9 1 1 2 47.95 3.09 1.8974 7 1 1 2 51.89 5.41 1.7621 -8 2 1 2 51.89 5.41 1.7621 6 2 1 2 52.86 1.59 1.7321 -1 3 1 2 53.74 9.32 1.7056 -3 3 1 2 53.74 9.32 1.7056 1 3 1 2 53.74 4.66 1.7056 -4 0 2 1 53.74 4.66 1.7056 0 0 2 1 56.06 2.42 1.6406 -11 1 1 2 56.06 2.42 1.6406 9 1 1 2 56.34 4.58 1.6330 12 0 0 1 56.34 18.23 1.6330 -5 3 1 2 56.34 18.23 1.6330 3 3 1 2 56.34 9.12 1.6330 -6 0 2 1 56.34 9.12 1.6330 2 0 2 1 57.12 6.96 1.6126 -5 1 2 2 57.12 22.85 1.6126 1 1 2 2 58.79 1.97 1.5706 -10 2 1 2 58.79 1.72 1.5706 8 2 1 2 60.44 5.71 1.5317 -7 1 2 2 60.44 5.71 1.5317 3 1 2 2 60.50 31.04 1.5302 -7 3 1 2 60.50 7.47 1.5302 5 3 1 2 60.50 3.73 1.5302 -8 0 2 1 60.50 15.52 1.5302 4 0 2 1 61.85 1.77 1.5000 -2 2 2 2 62.66 1.07 1.4827 -4 2 2 2 62.66 1.07 1.4827 0 2 2 2 65.03 2.07 1.4343 -13 1 1 2 65.03 4.63 1.4343 11 1 1 2 65.22 2.51 1.4304 -9 1 2 2 65.22 2.51 1.4304 5 1 2 2 66.07 5.66 1.4142 -9 3 1 2 66.07 5.66 1.4142 7 3 1 2 66.07 2.83 1.4142 -10 0 2 1 66.07 2.83 1.4142 6 0 2 1 68.88 5.52 1.3631 6 4 0 2 68.88 1.15 1.3631 -8 2 2 2 68.88 1.39 1.3631 4 2 2 2 69.83 11.81 1.3469 -4 4 1 2 69.83 3.69 1.3469 2 4 1 2 71.33 1.12 1.3222 7 1 2 2 72.83 3.04 1.2987 -6 4 1 2 72.83 3.04 1.2987 4 4 1 2 72.89 4.49 1.2978 -11 3 1 2 72.89 4.49 1.2978 9 3 1 2 72.89 2.24 1.2978 -12 0 2 1 72.89 2.24 1.2978 8 0 2 1 74.30 2.69 1.2765 15 1 0 2 75.77 2.16 1.2554 -14 2 1 2 75.77 2.16 1.2554 12 2 1 2 77.23 1.44 1.2352 -8 4 1 2 77.23 1.44 1.2352 6 4 1 2 80.91 21.30 1.1882 -13 3 1 2 80.91 4.45 1.1882 11 3 1 2 80.91 2.23 1.1882 -14 0 2 1 80.91 10.65 1.1882 10 0 2 1 85.85 3.58 1.1320 14 2 1 2 87.27 1.42 1.1172 -15 1 2 2 87.27 1.42 1.1172 11 1 2 2 88.51 1.84 1.1047 -14 2 2 2 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.