Mineralogical features of olivine in Dongujimqin mesosiderite

Two types of olivine in the Dongujimqin mesosiderite were identified: the m atrix olivine and the brecciform olivine. The electron microprobe analyses show that there are distinct differences between two types of olivine in th e aspects of the FeO/MnO ratio, the species of inclusion mineral, the conce ntrations of Fe an Ni in kamacite and taenite inclusions. It indicates that the matrix olivine was from the host meteorite and the brecciform olivine was from the other cosmic substance. It is the collision and combination of two cosmic substances soaring separately in cosmos that formed the Donguji mqin mesosiderite.