Ludwigite Diffraction data computed using the structure from the paper listed below, along with the cell parameters refined from single crystal data of R060844 Irwin M B, Peterson R C The Canadian Mineralogist 37 (1999) 939-943 The crystal structure of ludwigite Locality: Crestmore quarry, California, USA CELL PARAMETERS: 9.2370 12.2320 2.9854 90.000 90.000 90.000 SPACE GROUP: Pbam ATOM X Y Z OCCUPANCY ISO(B) Mg 0.00000 0.00000 0.00000 0.990 0.450 Fe 0.00000 0.00000 0.00000 0.010 0.450 Mg 0.50000 0.00000 0.50000 0.443 0.553 Fe 0.50000 0.00000 0.50000 0.557 0.553 Mg 0.00230 0.27980 0.00000 0.990 0.411 Fe 0.00230 0.27980 0.00000 0.010 0.411 Al 0.23990 0.11450 0.50000 0.080 0.387 Fe 0.23990 0.11450 0.50000 0.920 0.387 B 0.27430 0.36000 0.50000 1.000 0.442 O 0.85020 0.04340 0.50000 1.000 0.545 O 0.38410 0.07720 0.00000 1.000 0.568 O 0.62530 0.14240 0.50000 1.000 0.568 O 0.10920 0.14240 0.00000 1.000 0.505 O 0.85080 0.23730 0.50000 1.000 0.592 X-RAY WAVELENGTH: 1.541838 BOUNDS ON TWO THETA: 5.0 90.0 LIMITS IMPOSED ON THE INDICES ARE: +/- 8 +/- 11 +/- 2 MAX. ABS. INTENSITY / VOLUME**2: 15.25168652 The INTENSITY cut off value is 1.00 2-THETA INTENSITY D-SPACING H K L 12.01 12.10 7.3713 1 1 0 14.48 10.08 6.1160 0 2 0 17.39 100.00 5.0995 1 2 0 19.22 1.69 4.6185 2 0 0 29.20 3.18 3.0580 0 4 0 29.93 11.36 2.9859 3 1 0 29.93 26.88 2.9854 0 0 1 30.80 5.26 2.9030 1 4 0 32.35 8.78 2.7671 1 1 1 32.56 13.95 2.7502 3 2 0 33.40 7.01 2.6828 0 2 1 34.82 1.14 2.5764 1 2 1 35.20 87.52 2.5497 2 4 0 35.82 69.79 2.5072 2 0 1 36.59 1.37 2.4561 2 1 1 38.05 2.30 2.3649 1 5 0 38.63 7.53 2.3308 1 3 1 38.82 9.03 2.3198 2 2 1 39.00 7.16 2.3093 4 0 0 41.78 23.20 2.1618 2 5 0 41.81 1.30 2.1604 4 2 0 42.31 8.90 2.1362 0 4 1 42.32 5.61 2.1357 2 3 1 42.84 24.15 2.1112 3 1 1 44.81 56.40 2.0227 3 2 1 45.57 13.61 1.9908 1 6 0 46.86 14.71 1.9389 2 4 1 47.47 3.98 1.9154 3 5 0 47.95 25.09 1.8972 3 3 1 48.83 6.17 1.8650 2 6 0 49.15 1.34 1.8537 1 5 1 49.93 2.79 1.8266 4 0 1 51.69 8.03 1.7685 5 2 0 52.11 2.15 1.7551 3 4 1 52.24 1.61 1.7510 2 5 1 52.27 11.29 1.7502 4 2 1 53.36 1.16 1.7170 1 7 0 53.94 3.15 1.6998 3 6 0 55.48 9.34 1.6563 1 6 1 58.34 5.62 1.5818 2 6 1 58.89 24.25 1.5681 4 4 1 60.56 7.19 1.5290 0 8 0 60.88 16.23 1.5216 5 2 1 61.47 2.34 1.5085 1 8 0 62.19 23.63 1.4927 0 0 2 62.39 22.84 1.4884 1 7 1 62.92 7.46 1.4772 3 6 1 63.06 3.73 1.4743 5 5 0 63.46 16.95 1.4659 5 3 1 63.57 1.29 1.4636 4 5 1 65.11 5.03 1.4326 1 2 2 68.20 16.00 1.3751 6 4 0 68.55 1.04 1.3689 5 6 0 68.59 1.61 1.3683 6 0 1 69.01 4.70 1.3609 0 8 1 69.39 2.04 1.3544 3 7 1 69.86 3.20 1.3464 1 8 1 70.53 1.18 1.3353 6 2 1 70.54 1.26 1.3352 3 1 2 71.35 1.21 1.3219 5 5 1 71.98 2.58 1.3119 3 2 2 72.39 3.48 1.3054 2 8 1 72.55 1.34 1.3030 6 5 0 73.41 2.95 1.2899 7 2 0 73.52 16.23 1.2882 2 4 2 74.41 4.32 1.2749 4 8 0 75.90 2.75 1.2536 4 0 2 76.23 3.12 1.2490 6 4 1 76.56 1.43 1.2444 5 6 1 76.64 1.36 1.2434 3 9 0 77.75 3.58 1.2283 2 5 2 79.86 1.93 1.2011 7 1 1 80.41 3.63 1.1943 1 6 2 81.80 1.03 1.1774 3 5 2 82.22 2.17 1.1724 4 8 1 82.83 1.95 1.1654 2 6 2 83.78 5.48 1.1546 8 0 0 85.04 2.82 1.1407 5 2 2 85.40 1.31 1.1368 3 10 0 86.84 1.34 1.1216 3 6 2 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.