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.

在西晚二叠世煤中首次发现了热液成因的硫硫砷锑、碱性火山灰成因的胶态锐陆源碎屑成因的斜绿泥石。