变温法:变温法的原理是当温度改变时,油液的折光率比固体试料的折光率改变得多,在选定的一组浸油中,当温度由10℃升高到50℃时,其折光率降低0.02以上,而矿物的折光率芷此温度变化的范围内,只在小数点以后第四或第五位小数才有变化,对于鉴定矿物来说,此种改变可以省略。利用这种性质,只要矿物的折光率在某浸油因温度改变其折光率变化的幅度以内,则把矿物碎屑浸入该油内,改变温 Variable temperature method: The principle of variable temperature method is that when the temperature changes, the refractive index of the oil changes much more than the refractive index of the solid sample. In the selected group of immersed oil, when the temperature is increased from 10 ° C to 50 ° C , The refractive index decreased by more than 0.02, while the refractive index of the mineral Zhi within this temperature range, only after the decimal point fourth or fifth decimals have changed, for the identification of minerals, such changes can be omitted. With this property, as long as the refractive index of the mineral is within a range of the refractive index change of a certain impregnated oil due to temperature change, immersing the mineral crumb into the oil, changing the temperature