Chemical Examination of Harmoiome. 79 



harmotome occurs at Annerode, and was analyzed by Werne- 

 kink. 



1 thought it worth while to make a chemical analysis of the 

 harmoiome crysttils, which occur in con>iderabIe quantity in 

 the lead mine ofSirontian, in Argy If shire. The>ie crystals are 

 while, and translucent, and are all ( rysialized like the dode- 

 cahedral variety, figured by Ha y in his plate 8/». fig. 211, 



I'he fracture is foliated, the lustre glassy, the specific 

 gravity 2-4. 



Its constituents were found to be, 



Silica, - • 48-735 



Alumina, 15-100 



Barytes, 14-275 



Lime, 3-180 



Potash, 2-5.)0 



Water, 14-000 



97-840* 



Thus it contains both barytes and lime, and likewise potash, 

 a constituent not yet observed in harmoiome from other lo- 

 calities. 



The following table, exhibits the constituents of the differ- 

 ent varieties of harmoiome hitherto analyzed. 



* Another specimen analyzed in mj laboratory by Mr. Thomas Muir, 

 gave, 



Silica, 52-652 



Alumina, - - 9-900 



Barytes, 13 140 



Lime, 1-732 



Peroxide of iron, -------- 1-560 



Potash, 5 040 



Water, - - „ 14-800 



98.824 



