Pyroxene-ideal Thompson R M, Downs R T American Mineralogist 88 (2003) 653-666 Model pyroxenes I: Ideal pyroxene topologies Pyroxene #22a based on stacking sequence ABACBACBACBC Note: Atoms Mg, Si, and O are assigned to atomic positions just for convenience. _database_code_amcsd 0003028 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: 17.49782524 RIR: 0.580 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 4.20 3.2660 6 0 0 2 29.78 8.92 3.0000 0 2 0 2 30.14 1.70 2.9654 -1 1 1 4 30.14 1.70 2.9654 1 1 1 4 31.18 3.87 2.8685 2 1 1 4 32.85 3.04 2.7262 3 1 1 4 32.85 3.04 2.7262 -3 1 1 4 35.07 3.18 2.5584 4 1 1 4 40.02 2.18 2.2528 -1 2 1 4 40.02 6.36 2.2528 1 2 1 4 40.84 29.45 2.2094 6 2 0 4 40.84 5.15 2.2094 -2 2 1 4 40.84 5.15 2.2094 2 2 1 4 42.18 4.26 2.1423 3 2 1 4 42.18 4.26 2.1423 -3 2 1 4 44.00 1.10 2.0580 4 2 1 4 44.00 1.10 2.0580 -4 2 1 4 44.25 97.18 2.0467 9 1 0 4 44.25 1.41 2.0467 7 1 1 4 44.25 1.41 2.0467 -7 1 1 4 46.25 33.87 1.9629 -5 2 1 4 47.95 19.17 1.8974 -8 1 1 4 48.89 1.57 1.8628 6 2 1 4 48.89 1.57 1.8628 -6 2 1 4 51.89 36.57 1.7621 7 2 1 4 51.89 2.56 1.7621 -7 2 1 4 53.08 3.14 1.7253 -1 3 1 4 53.08 3.14 1.7253 1 3 1 4 53.08 1.57 1.7253 -1 0 2 2 53.08 1.57 1.7253 1 0 2 2 53.74 45.41 1.7056 -2 3 1 4 53.74 8.85 1.7056 2 3 1 4 53.74 4.43 1.7056 -2 0 2 2 53.74 22.71 1.7056 2 0 2 2 54.84 10.89 1.6742 3 3 1 4 54.84 10.89 1.6742 -3 3 1 4 54.84 5.45 1.6742 3 0 2 2 54.84 5.45 1.6742 -3 0 2 2 55.20 1.60 1.6641 -8 2 1 4 55.20 1.60 1.6641 8 2 1 4 55.41 2.40 1.6581 -1 1 2 4 56.06 9.35 1.6406 10 1 1 4 56.06 1.90 1.6406 -2 1 2 4 56.06 1.90 1.6406 2 1 2 4 56.34 4.45 1.6330 12 0 0 2 56.34 7.87 1.6330 -4 3 1 4 56.34 3.94 1.6330 4 0 2 2 57.12 1.63 1.6126 3 1 2 4 57.12 1.63 1.6126 -3 1 2 4 58.24 3.46 1.5842 5 3 1 4 58.24 3.46 1.5842 -5 3 1 4 58.24 1.73 1.5842 -5 0 2 2 58.24 1.73 1.5842 5 0 2 2 60.44 14.00 1.5317 5 1 2 4 65.22 1.23 1.4304 7 1 2 4 65.22 17.02 1.4304 -7 1 2 4 66.07 21.35 1.4142 -8 3 1 4 66.07 10.67 1.4142 8 0 2 2 66.78 4.66 1.4009 -11 2 1 4 68.31 1.38 1.3731 1 4 1 4 68.88 5.36 1.3631 6 4 0 4 72.83 7.42 1.2987 -5 4 1 4 72.89 1.93 1.2978 10 3 1 4 74.12 4.54 1.2792 8 2 2 4 74.30 2.61 1.2765 15 1 0 4 76.75 1.20 1.2418 -11 3 1 4 76.75 1.20 1.2418 11 3 1 4 77.23 9.75 1.2352 7 4 1 4 78.68 2.64 1.2161 11 1 2 4 80.67 2.81 1.1911 -10 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.