R. 0. E. Davis — Analysis of ' Kunzite. 29 



Art. V. — Analysis of Kunzite ; by K. O. E. Davis. 



At the request of Professor Charles Baskerville, Director 

 of the Chemical Laboratory, I undertook the chemical analysis 

 of kunzite, the new and beautiful variety of spodutnene, 

 described by Kunz and himself.* The methods used were 

 those given in Hillebrand's excellent "Principles of Pock 

 Analysis" f and need not be re-stated here. 



A selected, clean, deep lilac-colored crystal, quite free from 

 flaws, was ground to an impalpable powder and used in the 

 analytical work. Following are the figures obtained : 



Percent. 



Si0 2 64-05 



A1 2 3 .....__. 27-30 



NiO 0-06 



MnO . 0-11 



ZnO 0-44 



CaO 0'80 



MgO ... none 



K 2 0-06 



Na 2 0-30 



Li 2 ___ 6-88 



Loss on ignition 0'15 



Total _. 100-15 



~No chromium, vanadium, titanium, iron, strontium, barium, 

 thorium, zirconium or phosphorus was found. On account of 

 the unique properties possessed by the mineral the other rare 

 earths were looked for. Dr. W. J. Humphreys, of the Rouss 

 Physical Laboratory of the University of Virginia, kindly 

 photographed the arc spectrum obtained from the material 

 which had been freed from silicon and lithium. He reported 

 none of the characteristic lines of cerium and yttrium groups 

 present. The material lost its pink color on ignition. 



University of North Carolina. 



* See the preceding paper ; also Science, xviii, 303 and 769, 1903. 

 f Bulletin of the U. S. Geological Survey, No. 176. 



