Talc Diffraction data computed using the structure from the paper listed below, along with the cell parameters refined from the powder pattern of R050058 Gruner J W Zeitschrift fur Kristallographie 88 (1934) 412-419 The crystal structures of talc and pyrophyllite Locality: Harford County, Maryland, USA CELL PARAMETERS: 4.7740 8.8749 19.2460 90.000 103.770 90.000 SPACE GROUP: C2/c ATOM X Y Z OCCUPANCY ISO(B) Mg 0.00000 0.00000 0.00000 1.000 0.800 Mg 0.00000 0.33300 0.00000 1.000 0.800 Si -0.23900 0.00000 0.14300 1.000 0.500 Si 0.26100 0.16700 0.14300 1.000 0.500 O 0.20300 0.50000 0.05800 1.000 1.000 O 0.20300 0.16700 0.05800 1.000 1.000 OH 0.20300 -0.16700 0.05800 1.000 1.000 O 0.02500 0.08300 0.17600 1.000 1.000 O -0.47500 0.08300 0.17600 1.000 1.000 O 0.27500 0.33300 0.17600 1.000 1.000 X-RAY WAVELENGTH: 1.541838 BOUNDS ON TWO THETA: 5.0 90.0 LIMITS IMPOSED ON THE INDICES ARE: +/- 4 +/- 8 +/- 17 MAX. ABS. INTENSITY / VOLUME**2: 12.65265711 The INTENSITY cut off value is 1.00 2-THETA INTENSITY D-SPACING H K L 9.46 100.00 9.3464 0 0 2 18.99 10.58 4.6732 0 0 4 20.01 8.71 4.4374 0 2 0 20.57 33.58 4.3175 0 2 1 21.13 19.04 4.2041 -1 1 1 21.71 12.97 4.0937 -1 1 2 22.18 1.88 4.0086 0 2 2 23.12 7.98 3.8472 1 1 1 23.28 30.12 3.8211 -1 1 3 24.63 1.27 3.6145 0 2 3 25.45 6.91 3.4998 1 1 2 25.67 2.93 3.4705 -1 1 4 27.72 3.26 3.2179 0 2 4 28.43 17.67 3.1397 1 1 3 28.65 53.55 3.1155 0 0 6 31.29 11.34 2.8591 0 2 5 31.89 2.17 2.8064 1 1 4 35.20 1.91 2.5498 0 2 6 36.01 4.17 2.4939 1 3 0 36.04 5.23 2.4923 -1 1 7 36.07 13.31 2.4904 -1 3 2 37.69 1.93 2.3869 -2 0 2 38.53 54.64 2.3363 1 3 2 38.84 4.70 2.3184 2 0 0 39.04 28.14 2.3069 -2 0 4 40.17 1.16 2.2449 -1 1 8 40.96 1.27 2.2033 0 4 1 42.72 8.74 2.1168 -2 0 6 43.25 16.69 2.0918 1 3 4 43.29 1.15 2.0902 0 4 3 43.48 13.08 2.0813 -1 3 6 44.17 2.01 2.0503 1 1 7 47.76 4.48 1.9042 2 0 4 48.27 1.09 1.8854 -2 0 8 48.71 3.03 1.8693 0 0 10 49.56 1.51 1.8395 2 2 3 49.66 2.18 1.8357 1 3 6 49.97 3.21 1.8252 -2 2 7 52.75 1.10 1.7352 -2 2 8 53.71 2.35 1.7065 0 4 7 55.30 8.62 1.6612 -2 0 10 55.91 1.67 1.6445 -2 2 9 56.19 1.74 1.6369 -1 5 3 57.39 14.79 1.6057 1 3 8 58.60 1.50 1.5752 2 4 1 58.83 1.53 1.5698 -2 4 5 58.85 1.55 1.5691 1 5 3 58.97 1.28 1.5663 -3 1 3 59.33 1.19 1.5577 0 0 12 59.77 1.04 1.5473 -3 1 1 61.12 2.06 1.5163 0 4 9 62.76 1.03 1.4806 -3 1 7 62.82 7.96 1.4791 0 6 0 63.53 1.87 1.4644 -2 0 12 63.70 3.76 1.4610 0 6 2 66.21 3.59 1.4116 1 3 10 66.58 16.66 1.4044 -1 3 12 66.91 12.71 1.3984 -3 3 2 67.01 2.96 1.3965 -3 3 4 68.49 2.79 1.3699 3 3 0 70.47 1.30 1.3362 0 6 6 70.53 2.04 1.3352 0 0 14 71.01 1.56 1.3274 2 2 9 71.74 1.90 1.3157 -2 2 13 72.05 6.02 1.3107 2 0 10 72.21 1.25 1.3083 -3 3 8 72.85 1.23 1.2984 -2 0 14 75.64 1.14 1.2573 -2 6 2 76.07 1.97 1.2512 1 3 12 76.17 1.39 1.2498 0 6 8 76.37 3.94 1.2470 2 6 0 76.48 1.05 1.2456 3 3 4 76.49 2.81 1.2453 -1 3 14 76.50 9.24 1.2452 -2 6 4 77.16 1.32 1.2363 -3 3 10 78.71 1.37 1.2158 2 6 2 79.42 1.18 1.2067 0 4 13 80.48 1.48 1.1934 -4 0 4 82.40 1.19 1.1704 2 0 12 82.59 1.80 1.1681 2 6 4 82.72 1.12 1.1666 3 3 6 83.37 3.82 1.1592 4 0 0 83.58 1.05 1.1568 -3 3 12 88.51 4.36 1.1047 -2 6 10 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.