The alabandite and getchellite of hydrothermal origin, cement anatase of alkaline volcanic origin, and the high content of chlorite in coal were fist found in coals.

在西南地区晚二叠世煤发现了热液因的硫矿和硫砷锑矿、碱性火因的胶态锐钛矿和陆源碎屑因的斜绿泥石。