Kushiroite Okamura F P, Ghose S, Ohashi H American Mineralogist 59 (1974) 549-557 Structure and crystal chemistry of calcium Tschermak's pyroxene, CaAlAlSiO6 _database_code_amcsd 0000406 9.609 8.652 5.274 90 106.06 90 C2/c atom x y z occ B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3) Si .28802 .09693 .21337 .5 .00132 .00148 .00652 -.00004 .00065 -.00020 Al .28802 .09693 .21337 .5 .00132 .00148 .00652 -.00004 .00065 -.00020 Al1 0 .90934 .25 .00156 .00168 .00704 0 .00022 0 Ca2 0 .31117 .25 .00228 .00180 .00784 0 .00050 0 O1 .10519 .08210 .12264 .00242 .00259 .00838 .00065 .00122 .00042 O2 .36571 .26707 .30988 .00272 .00222 .01115 -.00020 .00139 -.00009 O3 .35524 .01881 .97977 .00182 .00302 .00947 .00005 .00092 .00004