22 PHYSIOGRAPHY. CI.ASS II. 



writing. Massive : composition imperfectly colum- 

 nar or granular, small but not impalpable. 



OBSERVATIONS. 



1. It is possible that the crystal represented in Fig. 35. 

 is not a simple one, but compound parallel to the plane r, 

 in which case the combinations might be hemi-prismatic. 

 The angle dd over s is = 85 40', over r == 94 20- very 

 nearly, the inclination of o on r about 125. The present 

 species presents a great many different varieties of crystal- 

 line forms, which being generally very much engaged 

 among each other, and moreover modified by regular com- 

 position, have not yet been satisfactorily developed.* 



2. According to KLAPROTH, it consists of 



Tellurium 6Q-00. 



Gold 30-00. 



Silver 10-00. 



It is remarkable, that the specific gravity of such a composi- 

 tion should be so low as has been stated above, it being much 

 less than that of tellurium itself. By calculation the 

 specific gravity is found above 10-0, which agrees pretty well 

 with that of the Yellow Tellurium, as given by MULLER 

 VON REICHENSTEIN, but this cannot refer to the same 

 species, the specific gravity of which is given above. The 

 prismatic Antimony-glance melts easily into a grey globule, 

 which fumes and covers the charcoal with a white oxide. 

 After having continued the blast for some time, a ductile 

 metallic globule is obtained. It is soluble in nitric acid. 



3. The prismatic Antimony -glance occurs at Offenbanya 

 in Transylvania, in very narrow, but quite regular veins* 



* It is difficult to trace the identity of the series of crystal- 

 lisation in Fig. 35. with the figure given by Mr PHILLIPS, un- 

 less one of them be discovered to have been in fact a compound 

 crystal. The inclination of c 3 on c 3 over M follows = 94 30', 

 nearly the same as d on d over r, and M on h is given = 126 

 8', perhaps a more accurate measurement than that indicated 

 above by approximation == 125. H. 



