S I.. H. Borgström. (LVII 



pigment coiitrary to Jon k e r's immbers. Despite a coiiti- 

 niied heating at the temperature of complete fusion of the 

 former mineral, the låter showed no signs of fusion or even 

 of sintering. — According Damm and K r a f f t ^) As^S^ 

 sublimates in vacuum at 230°. 



Stibiiite .SöaSg. The stibnite does not change percebtibly 

 at heating before the temperature of fusion is reached at 

 546°. The melted mäss is viscous. The boilingpoint is about 

 990°, at which temperature a vivid boiling commences. At a 

 little below this temperature a small destillate may be obser- 

 ved on the walls of the tube. — The point of fusion of stib- 

 nite from Felsöbanya was fixed at 546°, a sample from lyo, 

 Japan gave 550° and a sample from Hill, N. S. W. 551^. — 

 P é 1 a b o n 2) placed the meltingpoint of SbzS^ at 550°, 

 J a e g e r and van K 1 o o s t e r ^) at 546°, which value 

 here is adopted as probably the more accurate. D a m m and 

 K r a f f t (1. c.) State that SögSg sublimates vividly into va- 

 cuum at 530°. 



Bisnuithinite BzgSg. At 718° the bismuthinite fuses to an 

 extremely viscous fluid, which is still quite viscous at a 

 temperature 20° higher. — Bismuthinite from Nordmarken 

 fused at 717°, b. from .Jordåsen at 720°. A sample from the 

 first named locality was heated in a test-tube in a bunseu- 

 lamp and started to boil, but yielded some sulphur at the 

 same temperature. For that reason the cjuestion of the exact 

 boilingpoint was left open. 



GLianajuatite Bi^Se^. Guanajuatite from Guanajuato 

 fuses at 690°. — At some of the experiments it was very 

 difficult to detect any signs of sintering or fusion, even after 

 it had been heated to a 50° higher temperature. The sample 

 investigated was massive very fine grained and looked 

 homogenous but during some of the tests there appeared a 

 number of small round dröps on the mineral splinters (at or 

 above 690°), which dröps on cooling became surroundod 



') Ber. d. d. ch. Ges. W. 477.'i (1907). 



-) H. Pélabon, C. r. 156. 705. 



'■") Zeitschr. aiiorg. Cli. 7S. 245 (1902). 



