Diopside Comodi P, Princivalle F, Tirone M, Zanazzi P F European Journal of Mineralogy 7 (1995) 141-149 Comparative compressibility of clinopyroxenes from mantle nodules Sample: PC135 at room conditions _database_code_amcsd 0006580 9.678 8.836 5.257 90 106.9 90 C2/c atom x y z occ MgM1 0 .9065 .25 .765 AlM1 0 .9065 .25 .138 FeM1 0 .9065 .25 .045 TiM1 0 .9065 .25 .008 CrM1 0 .9065 .25 .044 CaM2 0 .2957 .25 .645 NaM2 0 .2957 .25 .094 MgM2 0 .2957 .25 .192 FeM2 0 .2957 .25 .067 MnM2 0 .2957 .25 .002 SiT .2896 .0926 .2353 .944 AlT .2896 .0926 .2353 .056 O1 .1151 .0865 .1403 O2 .3647 .2522 .3263 O3 .3521 .0185 .0010