鞍山和歪头山前寒武纪铁建造中普通辉石和阳起石共存。经镜下、化学成份和矿物相律的综合研究,作者认为,它们是平衡共生关系。这一共生组合的形成取决于两个因素:(1)原岩成份中的ca/(Mg+Fe~(2+))比值高,(2)角闪岩相下限的变质条件。因此它们形成的范围较窄,在自然界分布极为有限。 Anshan and Prestressed Hill Precambrian iron build in the ordinary pyroxene and actinolite coexist. By the mirror, the chemical composition and the law of the comprehensive study of minerals, the authors believe that they are balanced symbiotic relationship. The formation of this symbiotic assemblage depends on two factors: (1) the ca / ​​(Mg + Fe2 +) ratio in the original rock composition is high, and (2) the metamorphic conditions of the lower limit of amphibolite facies. Therefore, they form a narrower range and are extremely limited in nature.