Tridymite Kihara K, Matsumoto T, Imamura M Zeitschrift fur Kristallographie 177 (1986) 27-38 Structural change of orthorhombic-I tridymite with temperature: A study based on second-order thermal-vibrational parameters Note: hexagonal Gibbs model, T = 693 K Locality: synthetic refractory silica brick _database_code_amcsd 0020937 CELL PARAMETERS: 5.0470 5.0470 8.2620 90.000 90.000 120.000 SPACE GROUP: P6_3/mmc X-RAY WAVELENGTH: 1.541838 Cell Volume: 182.256 Density (g/cm3): 2.189 MAX. ABS. INTENSITY / VOLUME**2: 18.74809746 RIR: 2.788 RIR based on corundum from Acta Crystallographica A38 (1982) 733-739 2-THETA INTENSITY D-SPACING H K L Multiplicity 20.32 100.00 4.3708 1 0 0 6 21.51 53.04 4.1310 0 0 2 2 23.02 53.89 3.8635 1 0 1 12 29.76 17.10 3.0023 1 0 2 12 35.58 21.19 2.5235 1 1 0 6 38.64 11.15 2.3300 1 0 3 12 41.95 2.02 2.1535 1 1 2 12 42.80 5.57 2.1128 2 0 1 12 43.83 2.02 2.0655 0 0 4 2 47.04 1.09 1.9317 2 0 2 12 53.53 3.78 1.7119 2 0 3 12 55.63 3.89 1.6520 2 1 0 12 56.83 2.94 1.6200 2 1 1 24 59.84 4.74 1.5456 1 0 5 12 60.34 1.77 1.5339 2 1 2 24 63.89 2.14 1.4569 3 0 0 6 65.94 3.43 1.4167 2 1 3 24 71.59 1.99 1.3180 2 0 5 12 75.32 1.75 1.2617 2 2 0 6 79.25 1.14 1.2088 1 1 6 12 79.41 1.07 1.2067 2 2 2 12 82.58 1.98 1.1683 2 1 5 24 88.03 1.06 1.1095 3 1 3 24 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.