n.硫錳礦
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. 在西南地區(qū)晚二疊世煤中首次發(fā)現(xiàn)了熱液成因的硫錳礦和硫砷銻礦、堿性火山灰成因的膠態(tài)銳鈦礦和陸源碎屑成因的斜綠泥石。
