n.硫锰矿
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中首次发现了热液成因的硫锰矿和硫砷锑矿、碱性火山灰成因的胶态锐钛矿和陆源碎屑成因的斜绿泥石。
