t'LETCHER — The Melling-Points of some of the Rarer Minerals. 453 



Euxenite (Saetersdalen, Norway) : — turns yellow, reddens blue litmus, and 

 yields a white sublimate. Softens at about 1375, melts, and flows 

 with iridescence at 1460. The fusion shows surface-tension phenomena 

 and incipient crystallization on cooling. 



Polycrase (Hitteroe, Norway) : — powder reddens blue litmus paper, and yields 

 a white sublimate. Melts iudistinguishably below 1420, and flows with 

 iridescence at about 1560 ; the fusion coalesces into drops on cooling. 



Phosphates and Arsenates. 



Monazite (Moss, Norway) : — reddens blue litmus paper, and shows signs of 

 sublimation. Melting-point difficult to obtain. Particles " lose body " 

 at 1140, flow with iridescence at 1305, and eventually coalesce. 



Monazite (Arendal, Norway) : — melting unsatisfactory. Fuses with difficulty 

 at about 1140, and flows at 1480. 



Monazite \_Turnerite'], (Grisons, Switzerland) : — is infusible below 1480. 



Torbeniite (Portugal) : — is easily distinguished on the ribbon, and yields a 

 white sublimate. Melts below 1120, flows freely at 1330, and loses 

 body. 



Torbernite (Marienbad, Bohemia) : — softens and flows at 1125. 



Torbernite (Joachimsthal, Bohemia): — softens and flows at 1125. 



Torbernite (Spain) : — softens and flows at 1125. 



Torbernite (loc. unknown) : — rounds possibly at 1050, and melts sharply at 

 1125, to a brown glass. 



Zeunerite (Schneeberg, Saxony) : — reddens litmus, and yields a white 

 sublimate. Softens at about 1025, and melts rapidly with intumescence 

 to a brown glass at 1080 without flowing. Shows signs of sublimation, 

 and flows easily with intumescence at 1470. The fusion eventually 

 becomes indistinguishable. 



Autunite (Sabugal, Portugal) :— darkens on heating, and melts sharply at 

 1110, flowing freely at 1255 with iridescence. The fusion shows surface- 

 tension phenomena, coalesces at 1420, loses body, and solidifles to a slag. 



Autunite (Greenmont, U.S.A.) :— darkens temporarily on heating, and melts 

 with intumescence at 1045, becoming bright. Mows with iridescence at 

 about 1170, and solidifies to a brown glass, light yellow in thin section, 

 darkening on heating. 



Autunite (Bohemia) :— softens and melts sharply at 1170. 



Walpurgite (Saxony) :— melts to a brown glass, and yields a white sublimate 

 at 910. The fusion, which shows iridescence, coalesces into drops which 

 finally lose body. 



8s2 



