But there are isomorphous in many natural minerals, such as tetrahedrite, tennantite, galena, clausthalite, ferberite, hubnerite and so on. It is difficult to distinguish these minerals with similar characteristics using microscope. 但是自然界很多矿物存在类质同象现象,如黝铜矿和砷黝铜矿、方铅矿和硒铅矿、钨铁矿和钨锰矿等,这些矿物在显微镜下特征相似难以区分。