284 



TABLE 341. 



INDEX OF REFRACTION. 

 Selected Uniaxial Minerals. 



The values are arranged in the order of increasing indices for the ordinary ray and are for the sodium D line unless 

 otherwise indicated. Selected by Dr. Edgar T. Wherry from a private compilation of Dr. Esper S. Larsen of the U. S. 

 Geological Survey. 



SMITHSONIAN TABLES. 



