Alunite Zema M, Callegari A M, Tarantino S C, Gasparini E, Ghigna P Mineralogical Magazine 76 (2012) 613-623 Thermal expansion of alunite up to dehydroxylation and collapse of the crystal structure Note: T = 100 C Locality: Hungary _database_code_amcsd 0018985 6.9771 6.9771 17.360 90 90 120 R-3m atom x y z occ Uiso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) KA 0 0 0 .876 .016 .017 0 .012 .009 0 0 NaA 0 0 0 .071 .016 .017 0 .012 .009 0 0 HA 0 0 0 .147 .016 .017 0 .012 .009 0 0 OA 0 0 0 .049 .016 .017 0 .012 .009 0 0 Al 0 .5 .5 .975 .007 .004 .006 .010 .002 0 0 S 0 0 .30257 .008 .008 0 .009 .004 0 0 O1 0 0 .38589 .013 .016 0 .009 .008 0 0 O2 .21840 -.21840 -.06021 .011 .013 .013 .012 .010 0 0 O3 .12598 -.12598 .14029 .010 .007 .007 .015 .003 .001 .001 H .1830 -.1830 .1090 .034