282 Table 889. 



INDEX OF REFRACTION. 

 Selected Monorefringent or Isotropic Minerals. 



The values are for the sodium D line unless otherwise stated and are arranged in the order of increasiMg in(Uce& 

 Selected by Dr. Edgar T. Wherry from a private compilation of Dr. E. S. Larsen of the U. S. Geological burvey. 



Smithsonian Tableo. 



