许多人都认为铬尖晶石为正型尖晶石结构,它的化学式为(Mg~(+2)Fe~(+2)Zn~(+2)Mn~(+2))[Fe~(+3)Al~(+3)Cr~(+3)]o_4,其中“( )”表示四面体,“[ ]”表示八面体。四面体位置为二价阳离子充填,八面体位置为三价阳离子充填。我们对西藏铬尖晶石用穆斯堡尔谱仪测试之后认为:藏北铬尖晶石不具有典型的正型尖晶石结构,因为,测得了铁离子具有三个不同的四极分裂,又根据它们的同质异能位移确定出这三个铁离子位置的价态,其中一个是Fe~(+3),另两个为Fe~(+2)。Fe~(+3)位于八面体位置中,它的四极分裂为0.20～0.40mm/s.两个Fe~(+2)的四极分裂分 Many people think that chrome spinel is a positive spinel structure, and its chemical formula is (Mg2 + Fe2 + Zn2 + Mn2 + +3) Al ~ (+3) Cr ~ (+3)] o_4, where “()” means tetrahedron and “[]” means octahedron. Tetrahedral position for the divalent cation filling, octahedral position for the trivalent cation filling. After testing the Tibet chromium spinel with the Mössbauer spectroscopy, we believe that the northern Tibet spinel does not have the typical positive spinel structure because it was found that the iron ion has three different quadrupole splits, The valences of these three iron ions are also determined according to their isopower displacements, one of which is Fe ~ (+3) and the other two are Fe ~ (+2). Fe ~ (+3) is located in the octahedral position, its quadrupole splitting is 0.20 ~ 0.40mm / s. Two Fe ~ (+2)