Labradorite Diffraction data computed using the structure from the paper listed below, along with the cell parameters refined from the powder pattern of R060082 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: 8.1753 12.8785 7.1058 93.420 116.097 90.416 SPACE GROUP: C-1 ATOM X Y Z OCCUPANCY ISO(B) Ca 0.26650 0.98620 0.16490 0.325 3.355 Na 0.26650 0.98620 0.16490 0.160 3.355 Ca 0.27230 0.03060 0.09520 0.325 1.444 Na 0.27230 0.03060 0.09520 0.160 1.444 Si 0.00632 0.16304 0.21518 0.595 0.736 Al 0.00632 0.16304 0.21518 0.405 0.736 Si 0.00264 0.81626 0.23099 0.595 0.742 Al 0.00264 0.81626 0.23099 0.405 0.742 Si 0.68589 0.10882 0.31775 0.595 0.785 Al 0.68589 0.10882 0.31775 0.405 0.785 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 1.184 Ob 0.81310 0.10370 0.18860 1.000 1.694 Ob 0.81560 0.85320 0.24350 1.000 2.223 Oc 0.01390 0.28950 0.28180 1.000 1.686 Oc 0.01250 0.68690 0.21330 1.000 1.708 Od 0.19790 0.10730 0.38220 1.000 1.592 Od 0.19000 0.86610 0.42920 1.000 2.058 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: 4.601591561 The INTENSITY cut off value is 1.00 2-THETA INTENSITY D-SPACING H K L 13.67 8.49 6.4760 -1 1 0 15.22 1.46 5.8216 -1 -1 1 18.93 8.01 4.6885 0 -2 1 21.99 78.60 4.0420 -2 0 1 22.79 17.13 3.9013 1 -1 1 23.66 25.88 3.7606 1 1 1 23.66 40.39 3.7600 -1 3 0 24.46 34.97 3.6396 1 3 0 24.56 13.53 3.6240 -1 -3 1 25.45 1.37 3.4995 -1 3 1 25.65 13.34 3.4724 -1 -1 2 26.01 5.15 3.4260 -2 -2 1 26.47 25.47 3.3672 -1 1 2 27.55 54.24 3.2380 -2 2 0 27.78 59.83 3.2116 0 4 0 27.85 95.52 3.2032 -2 0 2 28.03 100.00 3.1829 0 0 2 28.47 43.15 3.1354 2 2 0 29.51 23.57 3.0266 1 -3 1 30.28 27.04 2.9517 0 -4 1 30.46 17.59 2.9348 0 -2 2 30.72 10.79 2.9108 -2 -2 2 31.53 24.55 2.8376 1 3 1 31.78 8.69 2.8155 -1 -3 2 33.77 14.62 2.6544 -1 3 2 35.27 3.28 2.5448 2 -2 1 35.56 5.12 2.5245 1 -1 2 35.64 4.08 2.5191 -3 -1 2 35.65 30.56 2.5185 -2 -4 1 35.77 20.09 2.5105 -2 4 1 35.88 1.49 2.5026 -3 1 2 36.49 2.22 2.4624 -2 4 0 36.80 3.63 2.4426 2 2 1 37.17 4.28 2.4191 -3 1 0 37.21 4.74 2.4164 -1 -5 1 37.70 3.24 2.3861 3 1 0 37.92 3.75 2.3729 2 4 0 38.23 3.31 2.3541 -1 5 1 39.03 5.88 2.3079 -3 3 1 39.46 6.41 2.2837 -3 -3 1 39.74 3.18 2.2680 -1 1 3 40.01 1.73 2.2533 1 -3 2 40.45 4.46 2.2299 1 -5 1 40.52 2.55 2.2263 -2 4 2 41.31 1.65 2.1855 0 4 2 41.83 2.35 2.1597 -2 2 3 41.85 1.47 2.1587 -3 3 0 42.18 1.17 2.1425 -1 -5 2 42.21 9.73 2.1411 0 6 0 42.45 13.64 2.1294 2 -4 1 43.01 9.01 2.1028 1 5 1 43.21 1.94 2.0938 -3 1 3 43.28 1.46 2.0903 3 3 0 44.78 1.30 2.0239 -1 5 2 44.85 2.56 2.0210 -4 0 2 45.00 3.40 2.0147 -4 0 1 45.21 1.04 2.0057 2 0 2 45.39 1.74 1.9979 3 -1 1 45.49 2.22 1.9938 -1 3 3 45.64 4.79 1.9878 0 6 1 46.17 1.73 1.9661 3 1 1 46.56 3.13 1.9507 2 -2 2 46.82 1.07 1.9405 -3 -3 3 47.10 3.33 1.9296 -4 -2 2 47.19 10.29 1.9260 -4 2 2 48.41 7.76 1.8803 2 2 2 48.42 5.16 1.8800 -2 6 0 48.46 1.11 1.8786 -3 5 1 49.13 1.47 1.8544 3 -3 1 49.30 11.23 1.8485 -4 0 3 49.44 1.22 1.8436 -2 4 3 49.62 3.57 1.8371 0 -6 2 49.71 14.34 1.8342 4 0 0 49.73 2.91 1.8335 1 -1 3 49.82 2.50 1.8303 0 -4 3 50.13 5.17 1.8198 2 6 0 50.36 3.45 1.8120 -2 -6 2 50.78 9.17 1.7980 1 1 3 50.83 2.51 1.7962 -1 7 0 51.26 1.16 1.7822 -1 -7 1 51.31 1.17 1.7807 3 3 1 51.54 23.43 1.7732 -2 0 4 52.19 5.99 1.7528 2 -4 2 52.28 1.88 1.7498 -2 6 2 52.37 1.62 1.7471 1 5 2 52.38 1.51 1.7469 -1 7 1 52.39 1.45 1.7465 4 2 0 52.72 3.33 1.7362 -2 -2 4 52.92 1.35 1.7301 1 -3 3 53.01 1.17 1.7274 2 -6 1 53.20 3.04 1.7216 0 6 2 53.21 3.32 1.7214 -4 4 1 53.39 2.09 1.7160 0 4 3 53.49 6.14 1.7130 -4 -4 2 53.66 3.60 1.7080 -4 4 2 54.20 1.78 1.6924 -4 -4 1 54.50 3.95 1.6836 -2 2 4 54.85 1.44 1.6737 -3 -5 3 55.56 3.51 1.6539 2 4 2 56.28 1.12 1.6347 -1 -3 4 56.46 1.50 1.6298 -3 -3 4 56.71 1.59 1.6231 3 -5 1 56.89 1.25 1.6185 -4 -4 3 57.12 4.26 1.6126 -3 5 3 57.38 2.32 1.6058 0 8 0 58.16 1.19 1.5861 4 0 1 58.24 1.61 1.5842 -5 1 1 58.26 1.39 1.5836 0 -8 1 58.79 2.38 1.5706 0 -2 4 58.90 1.72 1.5680 -4 -2 4 59.66 1.30 1.5497 3 -3 2 59.99 3.21 1.5421 3 5 1 59.99 1.35 1.5420 2 -2 3 60.06 2.17 1.5404 -4 2 4 60.14 1.16 1.5385 1 -7 2 60.76 1.08 1.5242 -5 -3 2 60.95 1.19 1.5201 0 2 4 61.20 1.95 1.5144 -2 4 4 61.25 1.65 1.5133 2 -6 2 62.13 5.36 1.4940 -2 -8 1 62.24 5.89 1.4917 -2 8 0 62.37 1.26 1.4887 3 3 2 62.61 4.12 1.4838 -5 -3 3 62.72 5.69 1.4813 -4 6 1 62.74 1.14 1.4809 -5 -3 1 62.98 1.54 1.4758 0 -8 2 63.14 2.47 1.4724 -5 3 3 63.16 1.01 1.4721 -4 -6 2 63.39 4.15 1.4673 -4 6 2 63.89 6.14 1.4570 0 6 3 64.17 3.77 1.4513 2 8 0 64.55 3.67 1.4436 2 -4 3 64.62 1.03 1.4422 3 7 0 65.35 2.09 1.4280 -5 1 4 65.79 1.43 1.4194 -4 6 0 65.83 3.93 1.4188 2 6 2 65.84 1.03 1.4186 -3 -7 3 65.93 1.58 1.4168 2 -8 1 66.27 1.76 1.4104 1 1 4 67.10 2.54 1.3949 4 4 1 67.29 3.60 1.3914 1 9 0 67.59 5.81 1.3860 1 -3 4 67.74 2.89 1.3833 -4 6 3 68.09 3.87 1.3770 -5 -3 4 68.31 3.27 1.3731 1 -9 1 68.35 1.18 1.3725 5 3 0 68.55 2.73 1.3690 2 4 3 68.61 2.25 1.3679 4 6 0 68.75 4.15 1.3654 -4 0 5 69.07 7.25 1.3598 -6 0 2 69.50 5.06 1.3525 -1 -9 2 69.53 6.97 1.3520 4 0 2 69.73 2.07 1.3486 -4 -2 5 69.81 1.94 1.3472 2 8 1 70.10 3.34 1.3424 -1 1 5 70.33 1.20 1.3385 4 -2 2 70.50 1.89 1.3357 -5 5 3 71.02 1.46 1.3272 -6 -2 2 71.10 1.63 1.3259 0 -8 3 71.32 1.28 1.3223 0 -6 4 71.35 2.85 1.3219 -1 -3 5 71.39 1.24 1.3212 3 1 3 71.61 1.13 1.3178 -6 2 3 72.33 1.09 1.3064 -4 -6 4 72.90 1.79 1.2975 -1 9 2 73.07 3.20 1.2950 2 -8 2 74.06 1.06 1.2801 -6 0 4 74.58 1.19 1.2724 4 -4 2 74.75 1.40 1.2700 -3 9 1 74.77 1.60 1.2697 2 0 4 74.92 1.35 1.2675 -4 8 1 75.04 1.08 1.2659 0 -2 5 75.50 4.16 1.2593 -4 -8 2 75.63 2.21 1.2574 -6 4 2 75.78 3.34 1.2553 -4 8 2 76.60 2.49 1.2439 -6 -4 3 76.85 1.48 1.2405 -5 -3 5 76.92 1.07 1.2394 0 8 3 77.20 2.06 1.2357 -4 4 5 77.90 1.03 1.2264 -6 4 1 78.17 3.84 1.2228 6 0 0 78.28 1.34 1.2213 4 4 2 78.70 4.40 1.2159 2 8 2 79.17 2.00 1.2099 -3 5 5 80.51 1.27 1.1930 6 2 0 81.86 1.20 1.1767 -4 -6 5 82.49 1.16 1.1693 -1 5 5 82.56 1.57 1.1685 1 -7 4 82.73 2.06 1.1665 -3 9 3 83.55 2.74 1.1572 -6 4 0 83.66 2.36 1.1560 3 5 3 84.33 1.36 1.1484 -5 -7 4 84.61 2.33 1.1453 -2 6 5 85.42 1.36 1.1365 -1 -9 4 86.08 1.46 1.1296 -1 -11 2 86.15 2.18 1.1288 6 4 0 86.23 1.46 1.1280 -3 -9 4 89.53 1.02 1.0948 -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.