Pyroxene-ideal Thompson R M, Downs R T American Mineralogist 88 (2003) 653-666 Model pyroxenes I: Ideal pyroxene topologies Pyroxene #8a based on stacking sequence ABABCABC Note: Atoms Mg, Si, and O are assigned to atomic positions just for convenience. _database_code_amcsd 0003004 CELL PARAMETERS: 13.0639 6.0000 3.4641 90.000 90.000 90.000 SPACE GROUP: P2/c X-RAY WAVELENGTH: 1.541838 Cell Volume: 271.529 Density (g/cm3): 9.821 MAX. ABS. INTENSITY / VOLUME**2: 17.00443091 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 2 1 0 4 27.31 4.32 3.2660 4 0 0 2 29.78 9.18 3.0000 0 2 0 2 29.78 3.24 3.0000 0 1 1 4 30.57 7.06 2.9239 1 1 1 4 30.57 3.76 2.9239 -1 1 1 4 32.85 6.65 2.7262 -2 1 1 4 40.37 25.28 2.2344 -1 2 1 4 40.84 30.30 2.2094 4 2 0 4 42.18 7.99 2.1423 -2 2 1 4 44.25 100.00 2.0467 6 1 0 4 45.07 8.75 2.0114 -3 2 1 4 45.07 15.95 2.0114 3 2 1 4 46.07 16.52 1.9703 5 1 1 4 46.07 1.34 1.9703 -5 1 1 4 48.89 22.02 1.8628 -4 2 1 4 48.89 7.75 1.8628 4 2 1 4 51.89 3.82 1.7621 -6 1 1 4 51.89 6.23 1.7621 6 1 1 4 53.36 46.90 1.7170 1 3 1 4 53.36 23.45 1.7170 -1 0 2 2 53.50 1.24 1.7126 5 2 1 4 53.50 25.87 1.7126 -5 2 1 4 54.84 25.67 1.6742 2 3 1 4 54.84 12.83 1.6742 -2 0 2 2 55.68 9.28 1.6508 1 1 2 4 56.34 4.58 1.6330 8 0 0 2 57.12 3.02 1.6126 2 1 2 4 57.24 16.26 1.6094 -3 3 1 4 57.24 4.78 1.6094 3 3 1 4 57.24 2.39 1.6094 -3 0 2 2 57.24 8.13 1.6094 3 0 2 2 58.22 4.96 1.5847 -7 1 1 4 58.22 1.20 1.5847 7 1 1 4 59.46 6.48 1.5545 -3 1 2 4 59.46 3.53 1.5545 3 1 2 4 60.50 5.15 1.5302 -4 3 1 4 60.50 2.58 1.5302 4 0 2 2 62.66 3.33 1.4827 -4 1 2 4 62.66 9.66 1.4827 4 1 2 4 64.55 7.80 1.4436 5 3 1 4 64.55 4.27 1.4436 -5 3 1 4 64.55 3.90 1.4436 -5 0 2 2 64.55 2.13 1.4436 5 0 2 2 64.68 3.27 1.4410 7 2 1 4 66.63 12.60 1.4036 5 1 2 4 68.55 4.90 1.3689 -1 4 1 4 68.88 5.52 1.3631 4 4 0 4 69.33 4.34 1.3555 -6 3 1 4 69.33 8.71 1.3555 6 3 1 4 69.33 4.35 1.3555 -6 0 2 2 69.33 2.17 1.3555 6 0 2 2 69.83 1.55 1.3469 -2 4 1 4 71.15 3.30 1.3252 8 2 1 4 71.94 3.44 1.3125 3 4 1 4 71.94 1.85 1.3125 -3 4 1 4 72.69 3.77 1.3009 -5 2 2 4 74.30 2.69 1.2765 10 1 0 4 74.78 2.15 1.2695 -7 3 1 4 74.78 1.67 1.2695 7 3 1 4 74.78 1.08 1.2695 7 0 2 2 74.86 5.32 1.2684 -4 4 1 4 74.86 1.78 1.2684 4 4 1 4 76.73 1.86 1.2420 -7 1 2 4 77.23 1.65 1.2352 -6 2 2 4 78.55 7.49 1.2178 -5 4 1 4 80.91 3.32 1.1882 -8 3 1 4 80.91 1.66 1.1882 8 0 2 2 82.50 1.64 1.1692 7 2 2 4 82.82 2.01 1.1655 -8 1 2 4 87.73 4.78 1.1125 -9 3 1 4 87.73 6.34 1.1125 9 3 1 4 87.73 3.17 1.1125 -9 0 2 2 87.73 2.39 1.1125 9 0 2 2 88.20 1.24 1.1078 7 4 1 4 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.