01 January 1970 0 10K Report

The procedure for the determination of the refractive index of liquid and powder samples (pharmaceutical) is known. (by using Abbe refractometer and Digital Refractometer). In general, the refractive index of a material is in between 1.3 to 1.7. I would like to know the procedure and equipment for the determination of the refractive index of the powder rock sample (Clay, bauxite, etc) Thanks

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