COLLEICTIOTV 



OF 



RADIO-ACTIVE MINERALS 



ACCORDING TO 



(Thesis presented before the Faculty of Sciences, Paris, June, 1903.) 



The locality from whence a specimen comes is important, no two sources of a 

 mineral affording examples of exactly the same degree of radio-activity. Their 

 external appearance also differs. Hence the number of local examples of several 

 minerals has been increased in this list beyond the number actually described in 

 the thesis. (Three Thorites are omitted.) The localities of the following speci- 

 mens are not always the same as those of the specimens investigated by Mme. 

 Curie. 



The steady development of the subject of radio-activity soon leaves any list 

 incomplete. We supply numerous other minerals desired by investigators in this 

 and allied subjects. 



1 Uraninite (Pitchblende) 



2 



3 



4 •' 



13 Xenotime 



14 Aeschynite 



1 5 Fergusonite 

 16 



5 Cleveite 



6 Torbernite (Chalcohte) 



7 Autunite 



8 Thorite 

 9 



17 Samarskite 



18 Columbite (Niobite) 

 19 



20 



21 Tantalite 



10 Orangite 



11 Monazite 

 12 



22 " 



23 Carnotite 

 24 



The collection comprises twenty.four specimens averaging about 100 grams 

 each, numbered to correspond to above list. Each specimen consists of a number 

 of pieces in a glass stoppered bottle, all fitted compactly in a handsomely finished 

 mahogany cabinet. Price complete, express paid, $30.00. 



Prepared by 



FOOTE MINEEAL CO., 



Established by Dr. A. E. Foote, 1876. 



1317 Arch Street, 24 Rue du Champ de Mars, 



PHILADELPHIA. PARIS. 



Dealers in Rare Minerals for Educational, Experimental and Commercial Uses. 

 Gram to carload lots. Minerals purchased. Mail small sample with your offer. 



Illusfrated Catalog Free. 



313^ 



