n.长石
=felspar.
There are obvious differences in feldspar content between the north and south sides of the catchment area. 汇水区南北的长石含量存在明显差异。
The ore-hunting indicator is of calcite-potassium feldspar veins containing pyritohedron pyrite. 直接找矿标志为含五角十二面体黄铁矿铁方解石钾长石脉。
