NO. 5 THE MICROSPECTROSCOPE IN MINERALOGY WHERRY 



MINERALS SHOWING THE URANIUM ABSORPTION SPECTRA 



Uranic Uranium 



Liebigite 



Voglite 



Autunite 



Uranocircite. . 

 Torbernite . . . 

 Uranospinite. . 



Zeunerite 



Johannite 



Uranium glass 



Red 



To 680 

 To 670 

 To 680 

 To 680 

 To 670 

 To 680 

 To 670 

 To 680 

 To 630 



Orange 



595 



Yellow 



(550) 

 (552) 



570 



Green 



(535) (515) 



(532) (515) 

 (535) 515 



(530) . . . 



545 525 



Blue 



495 (480) 



504 488 



499 484 



495 (485) 



503 487 



495 482 



505 489 

 497 479 

 505 485 



463 



472 

 (468) 

 (470) 



470 

 (467) 



472 

 (466) 



465 



Violet 



455 (440) 430 on 



458 447 440 on 

 (455) 445 

 (455) 448 



458 445 

 (455) (440) 430 on 



459 448 430 on 

 (450) ... 440 on 



... 460 on 



440 on 

 440 on 

 430 on 



Liebigite includes uranothallite; johannite includes uranochalcite and voglianite; the 

 following do not show definite spectra : carnotite, rutherfordine, trogerite, uraconite, urani- 

 nite, uranophane, uranopilite, uranosphserite, walpurgite, and zippeite; it may further be 

 noted that specimens labeled phosphuranylite have proved in almost every case to show 

 the spectrum of autunite, and have yielded calcium on qualitative examination, but an authen- 

 tic specimen of this mineral in the Brush collection, loaned for examination through the 

 kindness of Prof. Ford, showed no spectrum beyond slight general absorption in the blue. 

 See also note to rare earth table. 



Uranous Uranium 



Zircon, blue . . . 

 Zircon, green. . 

 Zircon, yellow. 

 Zircon, pink. . . 



Brown, white and colorless zircons do not show spectra. 



