Kirchhoffite Agakhanov A A, Pautov L A, Karpenko V Y, Sokolova E, Hawthorne F C The Canadian Mineralogist 50 (2012) 523-529 Kirchhoffite, CsBSi2O6, a new mineral species from the Darai-Pioz Alkaline Massif,Tajikistan: Description and crystal structure Locality: Upper Dara-Pioz alkaline massif, Garm district, Tajikistan _database_code_amcsd 0019219 13.019 13.019 12.899 90 90 90 *I4_1/acd 0 -.25 .125 atom x y z Uiso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) Cs .12323 .37323 .125 .0193 .0201 .0201 .0176 -.0009 .00231 -.00231 B .3362 .5862 .125 .0080 .010 .010 .004 -.005 .003 -.003 Si .09119 .11581 .33656 .0088 .0096 .0073 .0094 .0005 .0002 -.0012 O1 .1296 .1468 .0363 .0164 .020 .015 .015 .0016 -.0009 .0034 O2 .1382 .2191 .3900 .0181 .023 .010 .021 -.0008 -.002 -.0054 O3 .2740 .1018 .1448 .0151 .011 .021 .013 -.0045 -.0017 .0029