3 66 



Tables 405 (continued) and 406 



INDEX OF REFRACTION 

 TABLE 405 (Continued). — Selected Uniaxial Minerals 



TABLE 406. — Miscellaneous Uniaxial Crystals 



Crystal. 



Ammonium arseniate NH4H2ASO4 



Benzil (CeHsCOh 



Corundum, AI2O3, sapphire, ruby. 

 Ice at -8°C 



Ivory 



Potassium arseniate KH 2 AsQ( 



Sodium arseniate Na3As04.i2H«0 



" nitrate NaN03 



" phosphate Na3P04 12H2O 



Nickel sulphate NiS04.6H 2 



Strychnine sulphate 



Spectrum 

 line. 



Ordinary 

 ray. 



5766 



658S 



769 



308 



297 



539 



5762 



5674 



5632 



457 



586 



447 



5173 



5109 



5078 



614 



Authority. 



T. and C* 



Mean 



Osann 



Meyer 



Kohlrausch 

 T. and C. 



Mean 

 T. and C. 

 Martin 



* Topsoe and Christiansen. 



Smithsonian Tables 



