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一种较为少见的特殊硅质岩产于南京及巢湖地区的下二叠统孤峰组地层中。它的显著特征是岩石中存在大量菱形和不规则状孔隙，孔隙周边和孔隙间主要由微晶石英组成。通过对该岩石的成分和结构等特征的研究，认为它是一种交代碳酸盐岩成因的硅质岩，并定名为浮石状燧石。
A relatively rare special siliceous rock is produced in the Lower Permian Jufeng Formation in Nanjing and Chaohu areas. Its distinctive feature is the existence of a large number of rhombic and irregular pores in the rock, the pore periphery and pores mainly composed of microcrystalline quartz. Based on the study of the composition and structure of this rock, it is considered to be a chert called as plutonic origin and named as pumice flint.