在我国不同成因矿床的黄铁矿中,钴是主要杂质元素.按钻Wt％含量可分为:钻黄铁矿(Co>1％)、含钻黄铁矿(0.99—0.05％)及黄铁矿(<0.049％)三类.在我国三个不同成因富钻矿床中,作者采集了星均匀相产出的黄铁矿标本22个,经化学分析:钴常>0.1％,最高达3.76％;Mn、As一般<0.01％;Ni一般<0.05％.在若干含镍较高的黄铁矿中,研究钴含量与晶胞a关系时,要考虑扣除Ni对晶胞的影响,作者从克拉克等(1963)合成的NiS_2-FeS_2体系中,a与成分呈线性关系曲线,查得每1％NiS_2置换 Cobalt is the main impurity element in pyrite with different genetic deposits in our country. According to the Wt% content, it can be divided into pyrite (Co> 1%), pyrite (0.99-0.05%) and yellow Iron ore (<0.049%) .In the three different genetic rich diamond deposits in our country, the authors collected 22 samples of pyrite produced by the uniform phase of the stars. The chemical analysis shows that the cobalt content is usually> 0.1%, up to 3.76 %; Mn, As generally <0.01%; Ni generally <0.05% .In a number of high nickel containing pyrite, cobalt content and unit cell a relationship, we must consider deducting the impact of Ni on the unit cell, the author from Clarke et al (1963) synthesized NiS_2-FeS_2 system, a linear relationship between the composition of the curve, found every 1% NiS_2 replacement