BCTT Dollase W A, Ross C R American Mineralogist 78 (1993) 627-632 Crystal structures of the body-centered tetragonal tectosilicates: K1.14Mg0.57Si1.43O4, K1.10Zn0.55Si1.45O4, and K1.11Fe1.11Si0.89O4 Sample: Fe-rich phase _database_code_amcsd 0001573 9.102 9.102 5.341 90 90 90 I4mm atom x y z occ B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3) K1 0 .5 .316 .61 .004 .001 .48 0 0 0 K2 0 0 .496 .004 .004 .014 0 0 0 Fe .1818 .1818 0 .555 .006 .006 .021 -.001 -.005 -.005 Si .1818 .1818 0 .445 .006 .006 .021 -.001 -.005 -.005 O1 .2212 0 .079 .019 .005 .058 0 .005 0 O2 .2938 .2938 .180 .007 .007 .028 -.001 -.006 -.006