Diopside Bindi L, Safonov O G, Litvin Y A, Perchuk L L, Menchetti S European Journal of Mineralogy 14 (2002) 929-934 Ultrahigh potassium content in the clinopyroxene structure: an X-ray single-crystal study Sample: K2 _database_code_amcsd 0006948 9.744 8.904 5.273 90 106.14 90 C2/c atom x y z occ Uiso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) CaM2 0 .30054 1/4 .896 .01247 .01239 .01323 .00969 0 -.00044 0 MgM2 0 .30054 1/4 .032 .01247 .01239 .01323 .00969 0 -.00044 0 KM2 0 .30054 1/4 .072 .01247 .01239 .01323 .00969 0 -.00044 0 MgM1 0 .90677 1/4 .855 .00941 .00957 .00971 .00863 0 .00203 0 AlM1 0 .90677 1/4 .145 .00941 .00957 .00971 .00863 0 .00203 0 SiT .28775 .09247 .23260 .968 .00678 .00612 .00818 .00630 -.00033 .00214 .00084 AlT .28775 .09247 .23260 .032 .00678 .00612 .00818 .00630 -.00033 .00214 .00084 O1 .11522 .08746 .14715 .00912 .00537 .01121 .01081 .00098 .00230 .00095 O2 .36290 .24918 .32315 .01182 .01243 .01013 .01396 -.00361 .00544 .00036 O3 .34501 .01882 .98670 .01126 .01030 .01444 .00898 .00242 .00258 -.00340