Labradorite Diffraction data computed using the structure from the paper listed below, along with the cell parameters refined from the powder pattern of R050104 Wenk H R, Joswig W, Tagai T, Korekawa M, Smith B K American Mineralogist 65 (1980) 81-95 The average structure of An 62-66 labradorite Surtsey x-ray feldspar CELL PARAMETERS: 8.1749 12.8590 7.1125 93.520 116.245 89.930 SPACE GROUP: C-1 ATOM X Y Z OCCUPANCY ISO(B) Ca 0.26650 0.98620 0.16490 0.325 3.346 Na 0.26650 0.98620 0.16490 0.160 3.346 Ca 0.27230 0.03060 0.09520 0.325 1.447 Na 0.27230 0.03060 0.09520 0.160 1.447 Si 0.00632 0.16304 0.21518 0.595 0.734 Al 0.00632 0.16304 0.21518 0.405 0.734 Si 0.00264 0.81626 0.23099 0.595 0.743 Al 0.00264 0.81626 0.23099 0.405 0.743 Si 0.68589 0.10882 0.31775 0.595 0.786 Al 0.68589 0.10882 0.31775 0.405 0.786 Si 0.68100 0.87870 0.35715 0.595 0.613 Al 0.68100 0.87870 0.35715 0.405 0.613 Oa 0.00420 0.12900 0.98110 1.000 1.778 Oa 0.57980 0.99140 0.27890 1.000 1.183 Ob 0.81310 0.10370 0.18860 1.000 1.691 Ob 0.81560 0.85320 0.24350 1.000 2.223 Oc 0.01390 0.28950 0.28180 1.000 1.682 Oc 0.01250 0.68690 0.21330 1.000 1.711 Od 0.19790 0.10730 0.38220 1.000 1.592 Od 0.19000 0.86610 0.42920 1.000 2.060 X-RAY WAVELENGTH: 1.541838 BOUNDS ON TWO THETA: 5.0 90.0 LIMITS IMPOSED ON THE INDICES ARE: +/- 6 +/- 11 +/- 5 MAX. ABS. INTENSITY / VOLUME**2: 4.615235422 The INTENSITY cut off value is 1.00 2-THETA INTENSITY D-SPACING H K L 13.74 8.40 6.4448 -1 1 0 15.18 1.47 5.8381 -1 -1 1 18.96 7.97 4.6796 0 -2 1 21.98 78.70 4.0433 -2 0 1 22.86 17.00 3.8897 1 -1 1 23.65 25.92 3.7622 1 1 1 23.78 39.84 3.7411 -1 3 0 24.40 35.21 3.6480 1 3 0 24.52 13.61 3.6309 -1 -3 1 25.53 1.36 3.4894 -1 3 1 25.62 13.40 3.4764 -1 -1 2 25.92 5.20 3.4379 -2 -2 1 26.46 25.50 3.3679 -1 1 2 27.68 53.50 3.2224 -2 2 0 27.82 59.61 3.2073 0 4 0 27.82 95.88 3.2068 -2 0 2 28.04 100.00 3.1823 0 0 2 28.40 43.48 3.1430 2 2 0 29.65 23.26 3.0132 1 -3 1 30.34 26.88 2.9457 0 -4 1 30.50 17.53 2.9310 0 -2 2 30.63 10.89 2.9190 -2 -2 2 31.48 24.68 2.8420 1 3 1 31.75 8.72 2.8179 -1 -3 2 33.80 14.59 2.6520 -1 3 2 35.41 3.24 2.5347 2 -2 1 35.53 30.89 2.5265 -2 -4 1 35.56 4.11 2.5243 -3 -1 2 35.63 5.10 2.5199 1 -1 2 35.91 1.49 2.5009 -3 1 2 35.93 19.82 2.4992 -2 4 1 36.70 2.17 2.4489 -2 4 0 36.75 3.64 2.4454 2 2 1 37.18 4.76 2.4185 -1 -5 1 37.27 4.25 2.4128 -3 1 0 37.68 3.25 2.3872 3 1 0 37.81 3.79 2.3796 2 4 0 38.34 3.29 2.3477 -1 5 1 39.20 5.80 2.2979 -3 3 1 39.32 6.50 2.2912 -3 -3 1 39.73 3.18 2.2688 -1 1 3 40.15 1.72 2.2461 1 -3 2 40.63 4.41 2.2206 1 -5 1 40.63 2.53 2.2205 -2 4 2 41.30 1.65 2.1861 0 4 2 41.84 2.35 2.1592 -2 2 3 42.06 1.46 2.1483 -3 3 0 42.17 1.17 2.1431 -1 -5 2 42.27 9.69 2.1382 0 6 0 42.68 13.36 2.1187 2 -4 1 42.96 9.06 2.1055 1 5 1 43.18 1.47 2.0953 3 3 0 43.20 1.94 2.0942 -3 1 3 44.83 2.56 2.0217 -4 0 2 44.85 1.29 2.0211 -1 5 2 45.02 3.39 2.0138 -4 0 1 45.27 1.03 2.0033 2 0 2 45.50 2.23 1.9936 -1 3 3 45.51 1.72 1.9929 3 -1 1 45.67 4.79 1.9866 0 6 1 46.18 1.73 1.9657 3 1 1 46.68 1.08 1.9460 -3 -3 3 46.70 3.10 1.9449 2 -2 2 46.97 3.36 1.9344 -4 -2 2 47.29 10.21 1.9220 -4 2 2 48.39 7.78 1.8811 2 2 2 48.68 5.07 1.8706 -2 6 0 48.72 1.09 1.8692 -3 5 1 49.25 11.28 1.8502 -4 0 3 49.36 1.45 1.8463 3 -3 1 49.50 1.22 1.8414 -2 4 3 49.73 3.55 1.8333 0 -6 2 49.76 14.29 1.8323 4 0 0 49.80 2.89 1.8311 1 -1 3 49.90 2.49 1.8274 0 -4 3 50.01 5.21 1.8240 2 6 0 50.26 3.47 1.8154 -2 -6 2 50.79 9.17 1.7976 1 1 3 51.01 2.48 1.7903 -1 7 0 51.22 1.18 1.7834 3 3 1 51.25 1.16 1.7826 -1 -7 1 51.49 23.53 1.7747 -2 0 4 52.31 1.62 1.7489 1 5 2 52.32 1.46 1.7485 4 2 0 52.42 5.89 1.7456 2 -4 2 52.45 1.86 1.7447 -2 6 2 52.52 1.49 1.7425 -1 7 1 52.66 3.35 1.7382 -2 -2 4 53.06 1.34 1.7261 1 -3 3 53.21 3.04 1.7216 0 6 2 53.29 6.24 1.7189 -4 -4 2 53.30 1.15 1.7188 2 -6 1 53.37 2.09 1.7167 0 4 3 53.48 3.26 1.7135 -4 4 1 53.88 3.54 1.7017 -4 4 2 54.02 1.80 1.6976 -4 -4 1 54.49 3.96 1.6840 -2 2 4 54.69 1.46 1.6784 -3 -5 3 55.49 3.53 1.6561 2 4 2 56.28 1.13 1.6347 -1 -3 4 56.33 1.51 1.6332 -3 -3 4 56.69 1.27 1.6238 -4 -4 3 57.04 1.56 1.6147 3 -5 1 57.27 4.23 1.6088 -3 5 3 57.47 2.31 1.6037 0 8 0 58.24 1.19 1.5841 4 0 1 58.35 1.60 1.5815 -5 1 1 58.38 1.38 1.5807 0 -8 1 58.75 1.74 1.5715 -4 -2 4 58.84 2.37 1.5694 0 -2 4 59.84 3.24 1.5455 3 5 1 59.90 1.29 1.5441 3 -3 2 60.08 2.17 1.5400 -4 2 4 60.14 1.34 1.5385 2 -2 3 60.38 1.15 1.5331 1 -7 2 60.59 1.09 1.5282 -5 -3 2 60.93 1.19 1.5204 0 2 4 61.23 1.95 1.5138 -2 4 4 61.55 1.62 1.5066 2 -6 2 62.02 5.40 1.4964 -2 -8 1 62.32 1.26 1.4900 3 3 2 62.41 4.17 1.4880 -5 -3 3 62.55 5.79 1.4850 -2 8 0 62.60 1.15 1.4840 -5 -3 1 62.91 1.02 1.4773 -4 -6 2 63.09 5.57 1.4736 -4 6 1 63.12 1.53 1.4728 0 -8 2 63.29 2.45 1.4695 -5 3 3 63.70 4.08 1.4609 -4 6 2 63.87 6.15 1.4574 0 6 3 64.05 3.80 1.4538 2 8 0 64.43 1.04 1.4461 3 7 0 64.79 3.62 1.4390 2 -4 3 65.33 2.09 1.4283 -5 1 4 65.66 1.04 1.4220 -3 -7 3 65.71 3.96 1.4210 2 6 2 66.20 1.40 1.4117 -4 6 0 66.28 1.54 1.4102 2 -8 1 66.28 1.76 1.4101 1 1 4 66.97 2.56 1.3972 4 4 1 67.27 3.60 1.3917 1 9 0 67.73 5.77 1.3835 1 -3 4 67.88 3.92 1.3808 -5 -3 4 67.99 2.86 1.3788 -4 6 3 68.23 1.19 1.3745 5 3 0 68.38 2.28 1.3718 4 6 0 68.48 2.74 1.3701 2 4 3 68.57 3.23 1.3686 1 -9 1 68.66 4.17 1.3669 -4 0 5 69.09 7.25 1.3595 -6 0 2 69.53 5.06 1.3519 -1 -9 2 69.58 2.09 1.3511 -4 -2 5 69.64 6.93 1.3502 4 0 2 69.68 1.96 1.3495 2 8 1 70.07 3.34 1.3428 -1 1 5 70.56 1.18 1.3348 4 -2 2 70.76 1.86 1.3314 -5 5 3 70.90 1.47 1.3291 -6 -2 2 71.27 1.62 1.3232 0 -8 3 71.36 2.85 1.3217 -1 -3 5 71.44 1.24 1.3204 3 1 3 71.46 1.27 1.3201 0 -6 4 71.72 1.12 1.3160 -6 2 3 72.09 1.11 1.3101 -4 -6 4 73.04 1.78 1.2955 -1 9 2 73.44 3.14 1.2893 2 -8 2 74.00 1.06 1.2810 -6 0 4 74.85 1.60 1.2686 2 0 4 74.93 1.18 1.2673 4 -4 2 75.09 1.07 1.2651 0 -2 5 75.15 1.37 1.2642 -3 9 1 75.22 4.21 1.2633 -4 -8 2 75.38 1.33 1.2609 -4 8 1 75.93 2.18 1.2532 -6 4 2 76.18 3.27 1.2496 -4 8 2 76.34 2.52 1.2475 -6 -4 3 76.63 1.50 1.2435 -5 -3 5 76.92 1.07 1.2395 0 8 3 77.26 2.05 1.2349 -4 4 5 78.18 1.35 1.2227 4 4 2 78.25 1.02 1.2217 -6 4 1 78.27 3.82 1.2215 6 0 0 78.56 4.43 1.2176 2 8 2 79.23 1.99 1.2091 -3 5 5 80.46 1.27 1.1936 6 2 0 81.63 1.21 1.1795 -4 -6 5 82.48 1.16 1.1695 -1 5 5 82.84 1.56 1.1653 1 -7 4 83.03 2.04 1.1631 -3 9 3 83.55 2.37 1.1572 3 5 3 83.95 2.70 1.1527 -6 4 0 83.99 1.37 1.1522 -5 -7 4 84.65 2.33 1.1449 -2 6 5 85.51 1.36 1.1356 -1 -9 4 85.97 2.20 1.1307 6 4 0 86.06 1.47 1.1297 -3 -9 4 86.15 1.45 1.1289 -1 -11 2 89.50 1.02 1.0951 -2 -8 5 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.