自然硒是一种罕见的自然元素矿物,国内尚未见报道.据有关资料,已发现的自然硒,多由其它硒矿物经风化或蚀变生成.本文所研究的是一种产状特殊的自然硒,它是由煤层中含硒黄铁矿,在煤层自燃过程中升华结晶生成.这种自然硒晶形完整,晶体较大,成分纯.本文是对它的结晶习性、物理性质、光学性质、化学成分和晶体结构等进行较详细的矿物学研究. Natural selenium is a rare natural element mineral, has not been reported in the country.According to the relevant information, natural selenium has been found, and many other selenium minerals by weathering or alteration generated.In this paper, a special kind of natural Selenium, which consists of selenium-bearing pyrite in the coal seam, is sublimed and crystallized during the spontaneous combustion of the coal seam, and this natural selenium crystal form is complete with large crystals and pure components.In this paper, its crystal habit, physical properties, optical properties, Chemical composition and crystal structure for more detailed mineralogy.