Maifan stone Mai fan stone are a magma differentiation later period of the alkaline rock series of calcium result, is one and a half kinds of spot rocks weathered in the igenous rock,it is the aggregate of many kinds of mineral. Mai fan stone with plagioclase, potassium feldspar main fact, secondly is made up of quartz, horn blende, black mica and accessory substance phosphorus fossil,etc.. If Maifan stone make slight powder of 325 mesh, fetch one observe under electron microscope, it is obvious as the coral reef or spongy porous structure.