There is siderite, iron dolomite , calcite, Barite, pyrite, anatase, rutile, piece quartz, the mica ( or hydromica ), diaspore,etc. in the impurity in the mineral .

杂质矿物见有菱铁矿，铁白云，方，晶、黄铁矿，锐钛矿，金红，碎屑英，云母（或水云母），水铝。

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锰矿锑矿、碱性火山灰成因的胶态锐钛矿陆源碎屑成因的斜绿泥。

Electronmicroscopic examination shows that Ti-oxide (rutile or anatase) is replaced by brannerite, indicat-ing the metasomatic origin of brannerite.

在电镜下观察到钛铀矿与钛的氧化（金红或锐钛矿）成交代关系，说明钛铀矿是交代成因的。