WOLFF AND PALACHE. — APATITE FROM MINOT, ME. 



523 



Chemical Composition. * 



The material for analysis was taken from the deep purple clear 

 crystals, which were broken free from any adhering gangue and care- 

 fully examined with the lens; while the microscope confirmed the 

 purity of the mineral. The method followed was essentially that used 



A. Apatite from Minot, Maine. 



B. Calculated to 100. 



J. Apatite from Ceylon, Jannasch and Locke, loc. cit. 



or, Ca5P3[F.OH]Oi2. 



* By J. E. Wolff. 



t Calculated as OH = 0.55 per cent OH. 



