Feldspar can be divided into two large group, the potassium feldspar includes orthoclase and microcline.
长石可以分为钾长石和斜长石两大类，钾长石中包括正长石和微斜长石。
2
Rock-forming mineral, olivine, pyroxene, hornblende, orthoclase, feldspar, plagioclase, mica, quartz, biotite, calcite and other common metal and nonmetal minerals.