肇东、毫县陨石中的黑包体在总体成分、形状、大小上与陨石球粒相似,但两者的内部结构以及矿物组合不同。黑包体中矿物呈密堆状,主要由细粒橄榄石以及其它硅酸盐微晶组成,不含火成玻璃等特点表明黑包体未经历过熔融,它们可能是形成球粒的毛坯。因此认为球粒的形成有三个阶段:星云凝聚形成尘粒—尘粒吸积形成黑包体—黑包体熔融形成球粒。 In the Zhaodong and Muxian meteorites, the black bodies are similar to the chondrules in terms of their overall composition, shape and size, but the internal structures and mineral assemblages of the two are different. The minerals in the black body are in the shape of a pyramid, consisting mainly of fine-grained olivine and other silicate crystallites. The absence of pyrogenic glass indicates that the black bodies have not undergone melting and may be the blank that forms the pellets. Therefore, it is considered that the formation of pellets has three stages: the nebula is condensed to form dust particles - the dust particles accrete to form black bodies - the black bodies melt to form the pellets.