Windhoekite Chukanov N V, Britvin S N, Blass G, Belakovskiy D I, Van K V European Journal of Mineralogy 24 (2012) 171-179 Windhoekite, Ca2Fe3+3-x(Si8O20)(OH)4*10H2O, a new palygorskite-group mineral from the Aris phonolite, Namibia Note: the chemical formula for this mineral cannot be obtained from the crystal structure. The structure is missing two oxygens, and the OH positions were not given. Locality: Aris phonolite, Namibia _database_code_amcsd 0018919 CELL PARAMETERS: 14.3190 17.8250 5.2420 90.000 103.500 90.000 SPACE GROUP: C2/m X-RAY WAVELENGTH: 1.541838 Cell Volume: 1300.980 Density (g/cm3): 2.603 MAX. ABS. INTENSITY / VOLUME**2: 39.25976687 RIR: 4.912 RIR based on corundum from Acta Crystallographica A38 (1982) 733-739 2-THETA INTENSITY D-SPACING H K L Multiplicity 8.06 100.00 10.9727 1 1 0 4 19.92 1.54 4.4563 0 4 0 2 20.07 4.43 4.4247 0 2 1 4 21.50 3.47 4.1326 -2 2 1 4 23.71 5.18 3.7532 2 4 0 4 24.34 2.91 3.6576 3 3 0 4 24.96 2.86 3.5680 1 3 1 4 25.59 9.10 3.4808 4 0 0 2 25.96 5.08 3.4326 2 2 1 4 27.27 2.24 3.2703 -3 3 1 4 27.69 1.06 3.2221 -2 4 1 4 29.25 2.98 3.0528 -4 2 1 4 30.41 1.38 2.9392 -1 5 1 4 32.54 4.58 2.7513 5 1 0 4 34.00 8.64 2.6365 -3 5 1 4 35.21 4.23 2.5486 0 0 2 2 35.84 7.30 2.5057 -2 6 1 4 37.68 3.57 2.3876 1 1 2 4 38.55 2.38 2.3355 3 5 1 4 40.43 2.24 2.2310 2 0 2 2 41.17 3.70 2.1926 -4 6 1 4 41.71 1.09 2.1655 -5 5 1 4 42.34 1.09 2.1349 -3 7 1 4 42.42 1.08 2.1307 -5 1 2 4 52.05 1.98 1.7571 -7 5 1 4 54.42 1.13 1.6859 5 1 2 4 57.23 1.26 1.6096 1 11 0 4 59.63 1.21 1.5505 7 5 1 4 61.58 1.79 1.5061 -2 6 3 4 68.62 1.31 1.3677 8 6 1 4 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.