94 



Baskerville and Lockliart — Zinc Sulphide. 



Mineral. 

 Crytolite 

 Euxenite 

 Euxenite 

 Ferguson ite 

 Gadolinite 

 Guramite 

 Hj el mite 

 Monazite sand 

 Monazite 

 Monazite sand 

 Mixite 

 Orangite 

 Orthite 

 Pitchblende 



(Uraninite) 

 Pechurane 

 Samarskite 

 Steenstrupine 

 Thorite 



Thorite (Orangite) 

 Thorogummite 

 Tritomite 

 Tyrite 

 Uraninite 

 Uraninite 

 Uranite 

 Uranophane 



Xenotime 



Yttro-tantalite 



Zeunerite 



Locality. 

 S. Co., Texas 

 Spangercid, Norway 

 Arendal, Norway 

 Ytterby, Sweden 

 Fahlun, Sweden 

 Mitchell Co., N. C. 

 Karapfvet 

 Brazil, S. A. 

 Norway 



Mitchell Co., N. C. 

 Joachimsthal, Bohemia 

 Norway 

 Arendal, Norway 



Bohemia 



Mitchell Co., N. C. 



Urals 



Langesund, Norway 



Brevig, Norway 



Bluff ton, Llano Co., Tex. 



Brevig, Norway 



Tromso, Norway 



North Carolina 



Joachimsthal, Bohemia 



(rare) 

 Spruce Pine, Mitchell 



Co., N. C. 

 Hittero, Norway 

 Ytterby, Sweden 

 S. B., Germany 



Substance. Prepared by 



Uranium Tucker 



carbide 



Uranium oxide Tucker 

 Uranium 



nitrate Purchased 



Thorium-X Miner. From loo 



gals, wash-water 

 Thorium oxide Same as for 



Welsbach burners 



Berzelium* 



oxide 

 Thorium* 



oxide 

 Carolinium* 



oxide 



Irwin. Monazite 



sand 

 Davis. Monazite 



sand 

 Skinner. Monazite 



sand 



Result. 

 No glow 



No glow 



No glow 



Fair glow 

 Fair glow 



No glow 

 Fair glow 

 No glow 



Result. 

 No glow 

 Fair glow 

 Good glow 

 Fine glow 

 No glow 

 No glow 

 No glow 

 Fair glow 

 Medium 

 Very faint glow 

 No glow 

 Medium 

 No glow 

 Medium glow 



(below fair) 

 Strong glow 

 Fine glow 

 No glow 

 Fair glow 

 Fair glow 

 No glow 

 No glow 

 No glow 

 Fine glow 

 Very faint glow 

 No glow 



Fair glow 

 Faint 



No glow 

 No glow 



Remarks. 

 Not expected 

 from our knowl- 

 edge of the activ- 

 ity of uranium. 



Slight glow with 

 tiffanyites. No 

 glow with solid 

 willemite. 

 No glow with' 

 tiffanyites. 

 Slight glow with 

 tiffanyites. 



* These preparations were made in our laboratory, University of North. 

 Carolina. All showed some but not the same radio-activity when tested by 

 the electrical and photographic methods. 



