Labradorite Diffraction data computed using the structure from the paper listed below, along with the cell parameters refined from the powder pattern of R060275 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: 8.1789 12.8660 7.1117 93.531 116.246 89.920 SPACE GROUP: C-1 ATOM X Y Z OCCUPANCY ISO(B) Ca 0.26650 0.98620 0.16490 0.325 3.349 Na 0.26650 0.98620 0.16490 0.160 3.349 Ca 0.27230 0.03060 0.09520 0.325 1.448 Na 0.27230 0.03060 0.09520 0.160 1.448 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 0.614 Al 0.68100 0.87870 0.35715 0.405 0.614 Oa 0.00420 0.12900 0.98110 1.000 1.779 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 2.224 Oc 0.01390 0.28950 0.28180 1.000 1.683 Oc 0.01250 0.68690 0.21330 1.000 1.712 Od 0.19790 0.10730 0.38220 1.000 1.593 Od 0.19000 0.86610 0.42920 1.000 2.062 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: 4.604964162 The INTENSITY cut off value is 1.00 2-THETA INTENSITY D-SPACING H K L 13.73 8.41 6.4477 -1 1 0 15.17 1.47 5.8397 -1 -1 1 18.96 7.98 4.6808 0 -2 1 21.97 78.83 4.0451 -2 0 1 22.86 17.02 3.8905 1 -1 1 23.64 25.95 3.7629 1 1 1 23.77 39.91 3.7429 -1 3 0 24.39 35.28 3.6500 1 3 0 24.50 13.64 3.6328 -1 -3 1 25.52 1.36 3.4904 -1 3 1 25.63 13.40 3.4763 -1 -1 2 25.90 5.21 3.4398 -2 -2 1 26.47 25.50 3.3675 -1 1 2 27.67 53.59 3.2238 -2 2 0 27.80 59.74 3.2091 0 4 0 27.82 95.95 3.2072 -2 0 2 28.04 100.00 3.1819 0 0 2 28.38 43.57 3.1446 2 2 0 29.64 23.30 3.0142 1 -3 1 30.33 26.93 2.9470 0 -4 1 30.50 17.54 2.9312 0 -2 2 30.62 10.90 2.9199 -2 -2 2 31.47 24.71 2.8429 1 3 1 31.75 8.73 2.8186 -1 -3 2 33.80 14.60 2.6522 -1 3 2 35.40 3.24 2.5355 2 -2 1 35.51 30.97 2.5280 -2 -4 1 35.55 4.11 2.5252 -3 -1 2 35.63 5.10 2.5200 1 -1 2 35.90 1.49 2.5016 -3 1 2 35.92 19.85 2.5002 -2 4 1 36.68 2.18 2.4500 -2 4 0 36.74 3.65 2.4462 2 2 1 37.15 4.77 2.4198 -1 -5 1 37.25 4.26 2.4139 -3 1 0 37.66 3.25 2.3884 3 1 0 37.78 3.80 2.3809 2 4 0 38.32 3.30 2.3486 -1 5 1 39.19 5.81 2.2989 -3 3 1 39.30 6.52 2.2925 -3 -3 1 39.73 3.18 2.2685 -1 1 3 40.14 1.72 2.2465 1 -3 2 40.61 4.41 2.2216 1 -5 1 40.62 2.53 2.2209 -2 4 2 41.29 1.65 2.1864 0 4 2 41.84 2.35 2.1591 -2 2 3 42.04 1.46 2.1492 -3 3 0 42.15 1.17 2.1440 -1 -5 2 42.24 9.71 2.1394 0 6 0 42.66 13.38 2.1195 2 -4 1 42.94 9.08 2.1063 1 5 1 43.15 1.47 2.0964 3 3 0 43.19 1.94 2.0944 -3 1 3 44.81 2.57 2.0225 -4 0 2 44.84 1.29 2.0215 -1 5 2 44.99 3.40 2.0149 -4 0 1 45.26 1.04 2.0036 2 0 2 45.50 1.72 1.9936 3 -1 1 45.50 2.23 1.9935 -1 3 3 45.65 4.80 1.9874 0 6 1 46.16 1.73 1.9664 3 1 1 46.66 1.08 1.9466 -3 -3 3 46.70 3.10 1.9452 2 -2 2 46.95 3.37 1.9353 -4 -2 2 47.27 10.23 1.9228 -4 2 2 48.38 7.79 1.8814 2 2 2 48.65 5.08 1.8715 -2 6 0 48.69 1.09 1.8700 -3 5 1 49.24 11.30 1.8507 -4 0 3 49.34 1.45 1.8470 3 -3 1 49.50 1.22 1.8415 -2 4 3 49.71 3.55 1.8341 0 -6 2 49.74 14.32 1.8332 4 0 0 49.80 2.90 1.8311 1 -1 3 49.90 2.49 1.8277 0 -4 3 49.97 5.23 1.8250 2 6 0 50.23 3.48 1.8164 -2 -6 2 50.79 9.17 1.7976 1 1 3 50.99 2.48 1.7912 -1 7 0 51.20 1.18 1.7841 3 3 1 51.22 1.16 1.7836 -1 -7 1 51.50 23.52 1.7745 -2 0 4 52.29 1.46 1.7494 4 2 0 52.30 1.63 1.7493 1 5 2 52.40 5.90 1.7461 2 -4 2 52.43 1.86 1.7452 -2 6 2 52.49 1.49 1.7433 -1 7 1 52.66 3.35 1.7381 -2 -2 4 53.05 1.34 1.7262 1 -3 3 53.19 3.04 1.7220 0 6 2 53.26 6.25 1.7199 -4 -4 2 53.27 1.15 1.7195 2 -6 1 53.37 2.09 1.7167 0 4 3 53.45 3.27 1.7143 -4 4 1 53.85 3.55 1.7023 -4 4 2 53.98 1.81 1.6986 -4 -4 1 54.50 3.95 1.6838 -2 2 4 54.66 1.46 1.6791 -3 -5 3 55.47 3.53 1.6565 2 4 2 56.28 1.13 1.6347 -1 -3 4 56.32 1.51 1.6334 -3 -3 4 56.66 1.27 1.6245 -4 -4 3 57.01 1.56 1.6153 3 -5 1 57.25 4.23 1.6091 -3 5 3 57.43 2.32 1.6045 0 8 0 58.22 1.19 1.5847 4 0 1 58.31 1.60 1.5823 -5 1 1 58.35 1.39 1.5815 0 -8 1 58.74 1.75 1.5718 -4 -2 4 58.84 2.37 1.5693 0 -2 4 59.81 3.25 1.5462 3 5 1 59.89 1.29 1.5445 3 -3 2 60.07 2.17 1.5402 -4 2 4 60.14 1.34 1.5387 2 -2 3 60.35 1.15 1.5337 1 -7 2 60.55 1.09 1.5291 -5 -3 2 60.94 1.19 1.5203 0 2 4 61.23 1.95 1.5137 -2 4 4 61.53 1.63 1.5071 2 -6 2 61.98 5.41 1.4973 -2 -8 1 62.30 1.27 1.4904 3 3 2 62.38 4.18 1.4886 -5 -3 3 62.51 5.80 1.4858 -2 8 0 62.56 1.15 1.4849 -5 -3 1 62.87 1.03 1.4781 -4 -6 2 63.06 5.58 1.4743 -4 6 1 63.09 1.53 1.4735 0 -8 2 63.26 2.45 1.4699 -5 3 3 63.67 4.08 1.4615 -4 6 2 63.86 6.15 1.4576 0 6 3 64.01 3.81 1.4546 2 8 0 64.39 1.04 1.4469 3 7 0 64.78 3.62 1.4392 2 -4 3 65.32 2.10 1.4286 -5 1 4 65.62 1.04 1.4227 -3 -7 3 65.69 3.97 1.4214 2 6 2 66.17 1.40 1.4123 -4 6 0 66.24 1.54 1.4109 2 -8 1 66.29 1.76 1.4100 1 1 4 66.94 2.56 1.3978 4 4 1 67.23 3.61 1.3925 1 9 0 67.73 5.77 1.3835 1 -3 4 67.86 3.93 1.3812 -5 -3 4 67.97 2.86 1.3792 -4 6 3 68.19 1.19 1.3752 5 3 0 68.34 2.28 1.3726 4 6 0 68.47 2.74 1.3703 2 4 3 68.53 3.23 1.3693 1 -9 1 68.66 4.17 1.3669 -4 0 5 69.05 7.26 1.3602 -6 0 2 69.49 5.07 1.3526 -1 -9 2 69.58 2.09 1.3512 -4 -2 5 69.61 6.94 1.3506 4 0 2 69.64 1.96 1.3501 2 8 1 70.09 3.34 1.3426 -1 1 5 70.53 1.18 1.3352 4 -2 2 70.74 1.86 1.3318 -5 5 3 70.86 1.47 1.3298 -6 -2 2 71.24 1.62 1.3237 0 -8 3 71.37 2.85 1.3217 -1 -3 5 71.43 1.24 1.3206 3 1 3 71.45 1.27 1.3203 0 -6 4 71.69 1.12 1.3165 -6 2 3 72.06 1.11 1.3106 -4 -6 4 73.01 1.78 1.2959 -1 9 2 73.41 3.15 1.2898 2 -8 2 73.97 1.06 1.2815 -6 0 4 74.85 1.60 1.2686 2 0 4 74.91 1.18 1.2677 4 -4 2 75.10 1.07 1.2650 0 -2 5 75.11 1.37 1.2648 -3 9 1 75.16 4.22 1.2640 -4 -8 2 75.34 1.33 1.2614 -4 8 1 75.89 2.19 1.2537 -6 4 2 76.15 3.28 1.2501 -4 8 2 76.29 2.53 1.2482 -6 -4 3 76.61 1.50 1.2437 -5 -3 5 76.90 1.08 1.2398 0 8 3 77.26 2.05 1.2349 -4 4 5 78.15 1.35 1.2231 4 4 2 78.21 1.02 1.2223 -6 4 1 78.22 3.83 1.2221 6 0 0 78.53 4.43 1.2181 2 8 2 79.23 1.99 1.2091 -3 5 5 80.41 1.28 1.1942 6 2 0 81.60 1.21 1.1798 -4 -6 5 82.48 1.16 1.1694 -1 5 5 82.82 1.56 1.1655 1 -7 4 83.00 2.04 1.1635 -3 9 3 83.52 2.38 1.1575 3 5 3 83.90 2.70 1.1532 -6 4 0 83.95 1.38 1.1527 -5 -7 4 84.65 2.33 1.1449 -2 6 5 85.48 1.36 1.1360 -1 -9 4 85.92 2.20 1.1313 6 4 0 86.02 1.47 1.1302 -3 -9 4 86.09 1.46 1.1295 -1 -11 2 89.47 1.02 1.0953 -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.