156 W. T. SchaUer — Mineralogical Notes. 



Colorless, translucent, 1-822 



Colorless, . 1 , 8'72 



Faint yellow, 2-099 



Semi-opaque, __ 1-965 



the average of which is 1'939, though possibly the lowest figure 

 more nearly represents the density of the pure mineral. Smithf 

 gives as the density of colorless to milky white, translucent 

 material, the value 1-842. Kovar gives for white = 1*874 

 (-87 per cent Fe 2 3 ) and for yellow 1-937 (1-92 per cent Fe 2 3 ). 

 These values give an average for all the determinations of 

 1*93, while an average of the lowest values, representing pos- 

 sibly the purer mineral, gives 1*86. 



A determination of the index of refraction of the colorless 

 evansite from Idaho by Dr. F. E. "Wright gave 1*485, the index 

 for the colored varieties not varying more than -01 from this 

 value. 



Alabama. — The second sample was received through Prof. 

 Clarke from Mr. Charles Catlett, and the locality is given as 

 " from the coal seam just west of Columbiana, Alabama." It is 

 associated with coal and shows a light yellow color with a resin- 

 ous luster, and is transparent in small pieces. It is very brittle 

 and easily breaks into small fragments. An approximate analysis 

 serves to identify the mineral ; the phosphoric acid being 

 determined by difference. 



A1„0 3 38-33 



CaO 1-03 



MgO -75 



Loss on ign . 38-19 



P 2 5 21-70 (by diff.) 



100-00 



Literature. 



1864. Forbes, D. Phil. Mag., xxviii, 341. 



1883. Woodward, A. S. Min. Mag., v, 333. 



1893. Smith, H. G. Proc. R. Soc.^N. S. W., xxvii, 382. 



1896. Kovar, Fr. Abh. Bohni. Akad., xv, 1. 



1896. Petterd,* W. F. Cat. Min. Tasmania. 



1902. Petterd,* W. F. Papers and Proc. Roy. Soc. Tasmania, 

 18-33. 



1902. Kretschmer,* F. Jahrb. d. k. k. geol. Reichsanst. 

 Wien, 52, 353-494. 



1903. Vernadsky,* W. and Popoff, S. Central bl. Min. Geol., 

 331. 



* These references only mention the occurrence of evansite. 

 f Wrongly given as l - 939 in Dana's App. I, p. 25. 



