poikilite

例句：

1. 1.The mineral composition of the rock is dominated by poikilite.
   该岩石的矿物组成以磷灰石为主。
2. 2. Poikilite is often found in sedimentary rocks due to its high calcium content.
   由于其高钙含量，磷灰石常存在于沉积岩中。
3. 3. The study of poikilite has significant implications for understanding the formation and evolution of Earth's crust.
   磷灰石的研究对于理解地球地壳的形成和演变具有重要意义。