微粒矿物的鉴定,一直是岩矿鉴定工作的一个难题。近年来我们在费氏台上增加一些小部件,从而可以比较方便而准确地测定微粒矿物的折光率及其他光学性质。应用这种方法,可以测定过去一般书本上所讲的波状消光、放射纤维状等所谓光性不明矿物及部分半透明矿物。测定矿物的最小粒度目前可达4微米。 The identification of particulate minerals has been a challenge for the identification of rock and mine. In recent years, we have added some small components on the platform of the Fairchild to make it more convenient and accurate to measure the refractive index and other optical properties of particulate minerals. Using this method, we can measure so-called undiluted and partially translucent minerals such as wavy extinction and radial fiber that were traditionally written in books. The minimum particle size for the determination of minerals is currently up to 4 microns.