Cr~(3+)离子有三个3d电子,在六配位位置形成σ轨道时电子的组态是d~2sp~2。从这个电子组态得到的键的排列,正如CrF_3一样是规则八面体(Knox 1960)。另外,在许多情况下硅酸盐中八面体位置是畸变的。因为这相互冲突的品性,已看到某些有意思的现象。文本讨论了含NaCrSi_2O_6分子的辉石固溶体的不混溶现象、斜辉石和石榴石之间Cr—Al的分配和兰晶石巾Cr~(3+)的最大溶度和位置择优。 There are three 3d electrons in Cr ~ (3 +) ion, and the configuration of electron is d ~ 2sp ~ 2 when σ track is formed at six coordination sites. The arrangement of the keys from this electronic configuration, just like CrF3, is a regular octahedron (Knox 1960). In addition, octahedral positions in silicate are distorted in many cases. Because of this conflicting character, we have seen some interesting phenomena. The text discusses the immiscibility of pyroxene solid solution containing NaCrSi 2 O 6 molecules, the distribution of Cr-Al between clinopyroxene and garnet, and the maximum solubility and position of Cr 3+ in blue spar.